Toshiba Network Card T2N User Manual

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T2N Ethernet Port

Instruction Manual

REQUIREMENTS

Keep this instruction manual where it can be easily

referred to by users and those responsible for the

equipment.

Read this instruction manual carefully before using

the equipment.

After this instruction manual has been read, keep it

beside the equipment.

Main Menu

Contents

July, 1998

TOSHIBA CORPORATION

UM-TS02N**-E006

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Safety Precautions

Thank you for purchasing the Toshiba PU235N/245N CPU module, which is for use with the T2N

programmable controller.

This document describes the usage and handling of the PU235N/245N built-in Ethernet Port and

presents important cautionary items.

To use the PU235N/245N Ethernet Port safely, please read this document and all other related

documentation thoroughly and acquire thorough knowledge of the equipment and points that

require care before installing, operating, maintaining, or inspecting the PU235N/245N.

[Concerning Important Points]

1. The PU235N/245N is designed and manufactured for use with general industrial equipment,

including all types of production line control and manufacturing equipment.

The PU235N/245N is not designed or manufactured for use in equipment or systems on which

human lives depend.

Consult with your Toshiba sales representative in advance if you need to use an

PU235N/245N in a equipment or systems that are used in transportation equipment (such as

trains), medical applications, aerospace applications, nuclear reactor control, or underwater

relay equipment or other special contexts.

2. Although the PU235N/245N is manufactured under strict quality control, if an PU235N/245N

is to be used in critical equipment in which human lives could be endangered or in which large

losses could occur should the PU235N/245N fail, install safety equipment so that such

catastrophes cannot occur.

3. The PU235N/245N should only be installed, wired, used, or maintained by persons who have

a general knowledge of the handling of control equipment. Electrical shock, fires, failures, and

malfunctions can occur if an PU235N/245N is handled incorrectly. Persons whose knowledge

of control and electrical equipment is inadequate should avoid installing, wiring, using, or

maintaining this equipment, and should instead employ persons with the requisite specialized

knowledge.

4. This document and the related separate documentation is written for persons with a general

knowledge of programmable controllers and control equipment.

If you have any questions about the contents of this documentation, please feel free to contact

you Toshiba representative.

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Safety Precautions (continued)

[Warning indications]

This instruction manual provides important information to allow these products to be used safely

and correctly, to prevent in advance dangers to people managing or using this equipment or other

persons, and to prevent in advance losses to property. Be sure you thoroughly understand the

displays and symbols described below and follow the cautionary items and warnings included in

this document carefully.

Store this document carefully so that you can refer to it at any time even after you have read it.

Description of Safety Signs

Safety sign

Meaning

Indicates a potentially hazardous situation which could result in

death or serious injury if you do not follow the instructions.

WARNING

Indicates a potentially hazardous situation which may result in

minor or moderate injury and/or property damage if you do not

follow the instructions.

CAUTION

Explanations of Safety Symbols

Safety symbol

Meaning

This means "Hazard Alert" or "Beware of Hazard". The exact

nature of the hazard is shown in the triangle or described in text

near the triangle.

This is a safety alert symbol indicating a potential hazard. This

symbol is used together with a signal word.

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Safety Precautions (continued)

Precautions for operation

WARNING

1. Build emergency stop, interlock, and similar circuits outside the PU235N/245N.

If a breakdown or malfunction occurs in the PU235N/245N, there is the danger that someone could

be hurt or fatally injured. Also, other equipment could be damaged or a breakdown could occur.

T2N User's Manual - Hardware

3. Preparing for Operation (Hardware)

CAUTION

1. Take all necessary safety precautions before performing operations such as changing a running

program, forcing output, or switching to RUN (operate) or HALT (stop) modes.

Equipment can be damaged and breakdowns can be caused by operating this equipment

incorrectly.

T2N User's Manual - Hardware

Program Operation Manual

3. Preparing for Operation (Hardware)

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Safety Precautions (continued)

· Mounting in the base unit

CAUTION

1. The Ethernet Port is built-in the PU235N/245N. Do not remove the Ethernet Port from a

PU235N/245N.

2. The PU235N/245N itself should only be mounted or removed when all power is turned off. Similarly,

connections to the terminal block should only be made or removed when all power is turned off. Not

observing this precaution could result in electrical shocks, malfunctions, or damage to the

PU235N/245N or other equipment.

3. Do not allow foreign objects such as wire shreds to get into the PU235N/245N. This could result in

fire, breakdown, or malfunction.

4. Verify that connectors, cables, and the mounting of the PU235N/245N itself in the base unit are all

secured and that there is no play, missing screws, or disconnections in any of these parts.

If any of these parts is inadequately secured, breakdown or malfunction could occur as the result of

vibration.

3.3 Mounting in the Base Unit

Connecting to the network

CAUTION

1. Do not connect or disconnect cables when either the T2N or HUB power supply is turned on. This

can damage the PU235N/245N or cause it to malfunction.

2. When installing a 10BASE-T network, the cabling must be laid with adequate safety precautions and

in accordance with all applicable standards. Installation and wiring should be performed by a

qualified professional.

See the ISO/IEC8802-3 standard for installation environment standards.

3.1 Connecting to the Network

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Safety Precautions (continued)

Concerning:

Preparing for operation (software)

Computer link protocol and the PC link protocol transmission

Socket interface communication

RAS information

CAUTION

1. Chapters 4 - 7 present information related to using the functions provided by the Ethernet Port from

a T2N, including the instruction (request) format, important items that require attention, and sample

programs. That chapter also presents items considered necessary when using the Ethernet Port.

Make a point of understanding the content of chapter 4 thoroughly before writing programs that use

the Ethernet Port. The sample programs present basic examples of Ethernet Port usage, and should

be reviewed carefully before use in an actual system.

4. Preparing for operation (software)

5. Computer link protocol and the PC Link protocol transmission

6. Socket interface communication

7. RAS information

Installation environment and base unit mounting

CAUTION

1. Only use this equipment in the environment described in the T2N User's Manual - Hardware.

Use in any other environment can cause electrical shocks, fires, failures, and malfunctions.

2. Mount this equipment according to the mounting method specified in the T2N User's Manual -

Hardware.

Mounting in any direction other than the specified direction, or defective or inadequate mounting,

can result in the equipment falling, fires, failures, and malfunctions.

9.1 Installation Environment and Base Unit Mounting

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Safety Precautions (continued)

· Basic points in laying out a network

CAUTION

1. When laying network cable, take adequate safety measures and perform all operations in

accordance with the relevant standards. See the ISO/IEC8802-3 standard for details on laying

networks.

2. We strongly recommend hiring a qualified contractor who has specialized knowledge about safety

precautions and standards.

3. Avoid installing 10BASE5, 10BASE2 or 10BASE-T networks in environments that have high noise

levels. If it is necessary to install network cables in an environment subject to noise (electromagnetic

interference), use the noise reduction measures described elsewhere in this document.

9.2 Network Wiring

Maintenance

CAUTION

1. Always turn off the power before attaching or removing modules or cables. Electrical shock,

malfunctions, and breakdowns are possible if these operations are performed with the power on.

2. To keep the system operating normally at all times and to prevent trouble in advance, perform daily

inspections, periodic inspections, and cleaning.

3. Refer to the section on error recovery in this document if the Ethernet Port does not operate

correctly.

Contact your local Toshiba dealer or service representative if a breakdown occurs, and request that

the module be repaired or returned to Toshiba.

Operation and safety cannot be guaranteed if service is performed by anyone other than an

authorized Toshiba service representative.

4. Do not disassemble or modify the module hardware, and do not modify the module software.

Breakdowns or malfunctions may lead to fire, electrical shock, or injury.

5. Do not continue to use the module if it emits smoke or unusual odors, or if it is in an abnormal state

of any type.

Using the module in an abnormal state can lead to malfunctions, breakdowns, and electrical shock.

In such cases, immediately turn of all power and contact your local Toshiba dealer or service

representative.

Customers should never attempt repairs or modifications to this equipment themselves: repair and

modification operations are extremely dangerous.

Appendix 1 Maintenance and Inspection

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Usage Recommendations

This section collects the knowledge and operations that should be known by all users of this

equipment. Read this section carefully in conjunction with the safety precautions, thoroughly

master knowledge of the equipment, safety information, and the items that require attention, and

use the equipment correctly.

Support for 10BASE-T network

Usage Recommendations

1. Do not exceed the maximum cable length (100 m) in systems using 10BASE-T.

1.3 Basic Functionality

Ethernet Port registration

Usage Recommendations

1. Before performing the settings described in this chapter, register the Ethernet Port as T2N I/O. The

I/O type is ETHER (PU235N) or E/S (PU245N).

4.1 Ethernet Port Setup Flowchart (Software)

Restrictions on subnet masks

Usage Recommendations

1. The Ethernet Port does not allow the user to set the subnet mask. The Ethernet Port that the

network address number is 1 can use the subnet mask. Therefore the Ethernet Port cannot be used

in systems that operate a subnetwork.

4.4 Parameter Setup Request

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Usage Recommendations (continued)

· Computer link protocol transmission

Usage Recommendations

1. Since UDP/IP does not provide control functions to guaranteed communication reliability, higher

level protocols (such as retry) are required.

2. No processing is performed if a computer link protocol and a PC link protocol transmission

messages are received at any point other than a message transmission UDP socket.

5.1 Computer Link Protocol Transmission

5.3 PC Link Protocol Transmission (Data write)

5.4 PC Link Protocol Transmission (Data read)

Limitations on the T2N SEND and RECV instructions

Usage Recommendations

When using the SEND and RECV instructions:

1. When using fixed period interrupt programs, there are limitations on the number of words that can

be specified.

Appendix 4 Limitations on the T2N SEND and RECV Instructions

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Before Reading This Document

Thank you for purchasing a Toshiba PROSEC T2N multi-purpose programmable controller.

This manual describes the T2N Ethernet Port specifications and usage, and presents sample

programs for the Ethernet Port used with the PROSEC T2N.

The PU235N has Ethernet Port and the PU245N has Ethernet and TOSLINE-S20LP Port.

The T2N Ethernet Port is built-in a T2N and the T3H Ethernet module is independent module. It is

called “port” with this manual and called “station” with Ethernet Module EN311 for T3H

Instruction Manual are same meaning. This manual describes port.

When using this product, use the product correctly based on a thorough reading of this manual.

When using a T3H Ethernet module, see “Ethernet Module EN311 for T3H Instruction Manual”.

This document is organized as follows.

Chapter 1: Ethernet Port Overview

Presents an overview of the PU235N/245N Ethernet Port, including its functions, specifications,

and systems in which it can be used. Refer to this chapter to understand the basic performance of

the Ethernet Port.

Chapter 2: Ethernet Port Parts and Functions

Describes the function and names of the components of the Ethernet Port. Since this chapter

presents information required to understand the hardware settings described in the next chapter,

read this chapter carefully and use the Ethernet Port correctly.

Chapter 3: Preparing for Operation (Hardware)

Describes the hardware preparations and settings required to operate the Ethernet Port normally.

Chapter 4: Preparing for Operation (Software)

Describes the software settings required to operate the Ethernet Port normally, and presents

sample programs.

Chapter 5: Computer Link Protocol and the PC Link Protocol Transmission

Describes the instruction format used with computer link protocol and PC link protocol

transmission, and presents sample programs.

Chapter 6: Socket Interface Communication

Presents an overview of the socket interface, cautionary items, and the instruction format used on

the Ethernet Port with the socket interface, and presents sample programs.

Chapter 7: RAS Information

Describes the instruction format and the format of the Ethernet Port RAS information (including

port status and down information), and presents sample programs.

Chapter 8: Error Handling

Describes techniques for determining the causes of errors when Ethernet Port operation is

abnormal, and procedures for recovering from those errors.

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Chapter 9: Installation and Wiring

Describes the procedures for installing the Ethernet Port (and T2N), procedures for laying

transmission cable, and the nature of the construction required.

Appendix

Presents request code, completion status value, and error code tables and describes the minimum

transmission delay times and execution times for each instruction.

Note that in addition to this manual, Toshiba also provides a T2N User's Manual - Basic

Hardware and Function, a T-series Instruction Set, and a T-series Computer Link Operation

Manual. All these manuals should be read together.

Describes the configuration, specifications,

installation and wiring techniques,

T2N User's Manual - Basic Hardware

and Function

maintenance, and preventive maintenance

procedures for the T2N base system hardware

and describes the function provided by the

T2N CPU and the use of that CPU, and

presents information required for creating user

programs for the T2N.

(UM-TS02**-E001)

T-series Instruction Set

(UM-TS03***-E004)

Describes the detailed specifications of the

instruction words for the ladder and SFC

program languages, which are two of the

programming languages supported on the T2N.

T-series Computer Link Operation Manual

(UM-TS03***-E008)

Describes the specifications and use of

computer link protocol transmission, which is

built into the T2N CPU.

Registered trademarks:

Ethernet is a registered trademark of Xerox Corporation.

Cheapernet is not a registered trademark, but rather is a common name.

3 Com and Etherlink III are trademarks of 3 Com Corporation.

PC-NFS Pro is trademarks of Sun Microsystems, Inc..

Visual Ctt is trademarks of Microsoft Corporation.

Microsoft is trademarks of Microsoft Corporation.

UNIX is trademarks of UNIX System Laboratories, Inc..

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Contents

Safety Precautions¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 2

Usage Recommendations ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼8

Before Reading This Document¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 10

1. Ethernet Port Overview¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 14

1.1 System Configuration Using the Ethernet Port¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 14

1.2 LAN Standards and Terminology ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼15

1.3 Basic Functionality ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼16

1.4 Ethernet Port Specifications¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼21

1.5 Software Organization ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼22

2. PU235N/245N Parts and Functions ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 24

2.1 Front Panel¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼24

2.2 Component Functions¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 25

3. Preparing for Operation (Hardware)¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 26

3.1 Connecting to the Network¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 27

3.2 Network Wiring Equipment¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 28

4. Preparing for Operation (Software) ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 31

4.1 Ethernet Port Setup Flowchart (Software) ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 31

4.2 Ethernet Port Instruction Specifications¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 32

4.3 Ethernet Port Reset¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼39

4.4 Parameter Setup Request¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 41

4.5 Operating Mode Control Requests¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 46

5. Computer Link Protocol and the PC Link Protocol Transmission ¼¼¼¼¼¼¼¼¼ 50

5.1 Computer Link Protocol Transmission ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 50

5.2 Sample Computer Link Protocol Program ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 51

5.3 PC Link Protocol Transmission (Data write) ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 57

5.4 PC Link Protocol Transmission (Data read)¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 61

5.5 Sample PC Link Protocol Transmission Program¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 64

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6. Socket Interface Communication ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 68

6.1 Overview ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 68

6.2 Ethernet Port Socket Interface Usage Notes¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 72

6.3 Socket Interface Information ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 82

6.4 Using the Ethernet Port Socket Interface ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼84

6.5 Sample Programs ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼112

7. RAS Information ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼122

7.1 T2N Special Relays and Registers¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 123

7.2 Down Information ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼125

7.3 Remote Port Verification Request¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 126

7.4 Remote Port Loopback (for an Ethernet Port)

¼¼¼¼¼¼¼¼¼¼¼¼¼¼128

7.5 Time Setting ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼130

7.6 RAS Information Readout ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 132

8. Error Handling ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼140

8.1 LED Display ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼140

8.2 Status (error status) ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 143

8.3 T2N Special Relays and Registers ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 146

8.4 Socket Interface Information ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 147

8.5 Troubleshooting ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 148

9. Installation and Wiring ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼163

9.1 Installation Environment and Base Unit Mounting¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 163

9.2 Network Wiring ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼164

Appendix

Appendix 1 Maintenance and Inspection ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼ 169

Appendix 2 Request Code Table ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼171

Appendix 3 Status Table ¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼¼172

Appendix 4 Limitations on the T2N SEND and RECV Instructions ¼¼¼¼¼¼¼¼¼ 175

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1. Ethernet Port Overview

1.1 System Configuration Using the Ethernet Port

This section describes the systems that can be configured using the PU235N/245N Ethernet Port

for the PROSEC T2N programmable controller. The remainder of this document refers to the

PROSEC T2N programmable controller as the T2N, and the Ethernet Port as the PU235N/245N

Ethernet Port.

The Ethernet Port is a communication port for connecting a T2N system to a 10BASE-T (Twisted

pair Ethernet) LAN (local area network). It is operated a T2N option module. The T2N connects

to the above mentioned LAN through the Ethernet Port and exchanges data with host computers

(workstations or personal computers) or other programmable controllers on the LAN.

The remainder of this section presents a system that uses the Ethernet Port. In this example, the

T2N is connected to host machines such as workstations and personal computers over a 10BASE-

T LAN and the T2N is connected to lower level controllers using a Toshiba proprietary control

LAN.

Host machine

Personal computer

Workstation

T3H:PROSEC-T3H

T2N:PROSEC-T2N

T2 :PROSEC-T2

S20LP:TOSLINE-20LP

F10:TOSLINE-F10

R-I/O: Remote I/O for F10

10BASE-T

HUB

PU235N

PU245N

TOSLINE-F10

TOSLINE-S20LP

PU245N

R-I/O

I/O I/O

S I/O I/O

S I/O

S I/O I/O

Figure 1.1 System Configuration Examples

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1.2 LAN Standards and Terminology

The LANs commonly referred to as Ethernet LANs are defined by two standards, the Ethernet

version 2.0 standard (DIX) developed by DEC, Intel, and Xerox, and the ISO 8802-3 standard

(IEEE 802.3), which is an international version of the DIX standard. Since the ISO 8802-3

includes the DIX standard, network equipment built to those standards will be basically

compatible.

Since the Ethernet Port physical layer has a structure that conforms to the ISO 8802-3 standard,

users must be sure to use network equipment that conforms to the ISO 8802-3 standard.

The networking terminology used in this document is the terminology used in the ISO 8802-3

standard. Table 1.3 presents the correspondence between the DIX standard terminology (common

terms) and the ISO 8802-3 standard terminology.

Table 1.1 Networking Terminology Correspondences

DIX Standard

Ethernet

ISO 8802-3 Standard

10BASE5

Cheapernet

10BASE2

Coaxial cable

Transceiver cable

Transceiver

Coaxial cable

AUI (attachment unit interface) cable

MAU (medium attachment unit)

MAC address

Ethernet address

Ethernet is a registered trademark of Xerox, Corporation.

Cheapernet is not a registered trademark, but rather is a common name.

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1.3 Basic Functionality

The Ethernet Port has the following main features.

1. T series computer link protocol transmission (slave port)

The host machine can upload or download user programs, execute control commands, and read or

write register data to a T2N on the 10BASE-T LAN using the T series computer link protocol.

This function can be used simply by making basic settings on the Ethernet Port from the T2N;

there is no need to write special user programs for the T2N.

Computer link protocol uses UDP/IP as the transmission protocol.

UDP/IP: User datagram protocol/Internet protocol.

Host machine

Personal computer

Workstation

Application

program

Response

10BASE-T

Request

Ethernet

Port

T2N operating

system

User program

Figure 1.2 T Series Computer Link Protocol Transmission (slave port)

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2. T series/PC link protocol transmission

The T2N can use the T series/PC link protocol to read or write register data on another T2N on the

10BASE-T LAN.

While T2N user programs for reading and writing are necessary to use the host functions, only the

basic Ethernet Port settings performed from the T2N are required to use the slave functions, and no

special user programs are required on the T2N.

PC link protocol transmission uses UDP/IP as the transmission protocol.

UDP/IP: User datagram protocol/Internet protocol .

PC link host station

User program

T2N operating

system

Ethernet

Port

Response

10BASE-T

Request

Ethernet

Port

T2N operating

system

User program

PC link slave station

Figure 1.3 T Series/PC Link Protocol Transmission

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3. Socket interface support

This is a standard communications technique used on engineering workstations and similar

computers. Transmission between user programs on the T2N and host machines is possible using

the socket interface. There are eight sockets on an Ethernet Port and the transmission protocol

(TCP/IP or UDP/IP) can be specified for each socket.

TCP/IP: Transmission control protocol/Internet protocol

UDP/IP: User datagram protocol/Internet protocol

Host machine

Personal computer

Workstation

Application

program

Socket

Data transmission

10BASE-T

Ethernet

Port

Socket

T2N

User program

Figure 1.4 Socket Interface

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4. PC (programmable controller) gateway function

* This function is under development, but is currently not supported.

Toshiba plans to add support to the T2N for a gateway function between the Ethernet Port and the

TOSLINE-S20LP Port. This function will allow access to stations (PROSEC-T3H/T2N) on the

TOSLINE-S20LP from ports on the 10BASE-T LAN using the computer link protocol.

Host machine

Personal computer

Workstation

Application

program

Response

Request

10BASE-T

Ethernet

Port

T2N operating

system

PU245N

TOSLINE-

S20LP Port

TOSLINE-S20LP

Response

Request

TOSLINE

-S20LP

TOSLINE

-S20LP

TOSLINE

-S20LP

T3H

T2N

Figure 1.5 Gateway Function

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5. Support for 10BASE-T Network

The Ethernet Port can connect to a 10BASE-T network

10BASE-T is a LAN technology that uses baseband transmission, provides a data transmission

rate of 10 Mbps, and supports single segments of up to 100 meters in length.

This network uses 10BASE-T (Twisted pair cable) as the transmission cable.

The figure below shows the maximum interport separation.

Node

Twisted pair cable

100m

HUB

500m

HUB

500m

HUB

500m

HUB

Coaxial cable (10BASE5)

It is regarded that HUB is repeater and a twisted pair cable is single segment (link

segment).

Figure 1.6 10BASE-T

Usage Recommendations

1. Do not exceed the maximum cable length (100 m) in systems using 10BASE-T.

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1.4 Ethernet Port Specifications

Table 1.2 lists the Ethernet Port specifications. The general specifications of the Ethernet Port

conform to those of the T2N main unit.

Table 1.2 Functional Specifications

Item

Specification

Module type

PU235N/245N (Ethernet Port is built-in)

10BASE-T

Transmission

specifications

Media access method

Modulation

CSMA/CD

Baseband

Transmission topology

Transmission speed

Bus type

10 Mbps

Maximum distance between

ports

200 m (Case of single HUB)

1700 m (Case of four HUB)

100 m (Between port and HUB)

single port per segment

None

Maximum segment length

Maximum number of ports

Minimum port separation

Connector

8-pin modular connector (RJ-45)

Unshield twisted pair

Connecting cable

Transmission services

1. T series computer link protocol (slave port)

2. T series/PC link protocol

3. Socket interface (8 sockets)

4. PC gateway function (currently unsupported)

RAS functions

1. Self diagnostics at power on

ROM, RAM, LAN controller, EEPROM,

T2N interface buffer memory, MAC address

2. Test functions accessible from user programs

•

Remote port verification request

Remote port loopback test (Between T2N and T2N/T3H systems)

3. Data provided by RAS data readout

•

Event trace

LAN controller (network) information

Protocol state

4. Time/date setup function

5. Station status in the T2N special registers (SW)

6. Socket information in the T2N interface buffer

Consumed current [A]

External dimensions [mm]

Weight [grams]

0.6A (5V DC)

99.0 (W) ´ 122 (H)

200

Mounting method

Built-in T2N

Number of modules mountable

Access method

1 modules per T2N

SEND/RECV instructions (module control and transmission functions)

Segment: A network unit formed from a single transmission medium (twisted pair cable)

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1.5 Software Organization

The Ethernet Port transmission functions (computer link protocol transmission, PC link protocol

transmission and socket interface transmission) are implemented with the software organization

shown in the figure.

T2N user program

SEND/RECV instruction

T2N Upper Protocol

software

T2N firmware

Computer link/PC link/socket interface

T2N internal bus

Ethernet Port interface

UDP

TCP

Ethernet

Port

ARP

CSMA/CD

10BASE-T

ICMP

Figure 1.7 Software Organization

TCP (transmission control protocol)

Before transferring data with the remote port, a connection (virtual communication circuit) is first

established and then data is transferred. Transmission reliability is guaranteed by packet order

control, retransmission, flow control, and other techniques.

The Ethernet Port supports the following:

Response bit (ACK)

Push bit (PSH)

Synchronized bit (SYN)

Fin bit (FIN)

Retransferring

Window (flow) control

Segment division

Reporting of the maximum receivable segment length

The Ethernet Port does not support the reset bit (RST).

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UDP (User datagram protocol)

Transfers data with the remote port in datagram units. Provides high-speed transfers since a

connection is not used, but does not have control functions that assure reliability, as does TCP.

Thus it requires support from a higher level protocol.

The Ethernet Port supports the:

the UDP checksum

function.

IP (Internet protocol)

Sends and receives data in the datagram format. Sends data in datagram units to the remote port

according to the IP address.

The Ethernet Port supports:

Data fragmentation and reassembly,

Direct routing, and

Broadcast

functions.

The Ethernet Port does not support the indirect routing and multicast functions.

Although the Ethernet Port physical layer structure conforms to the ISO8802-3 standard, it adopts

DIX standard frames as the data link frames (the IP datagram send/receive frames).

ARP (Address resolution protocol)

Searches for a port MAC address (Ethernet address) that has a specified IP address.

ICMP (Internet control message protocol)

Reports IP packet errors, verifies the state of the IP network, and supports related functions.

The Ethernet Port supports the:

Echo request/reply,

Timestamp request/reply, and

Information request

functions.

The Ethernet Port does not support the:

Destination unreachable,

Source quench,

Redirect,

Time exceeded for a datagram,

Parameter problem on datagram,

Information reply,

Address mask request, and

Address mask reply

functions.

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2. Ethernet Port Parts and Functions

This chapter describes the sections of the Ethernet Port and their functions.

2.1 Front Panel

ERUN ET/R

EACC

Ethernet Port LED Display

SRUN SONL SACC

STNH

STNL

TOSLINE-S20LP

Port parts

(PU245N only)

OTR1

OTR2

10BASE-T

Ethernet Port 10BASE-T

connector for connecting

transmission cable

Figure 2.1 PU235N/245N External Dimensions

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2.2 Component Functions

(1) LED Display

Indicators that display the Ethernet Port operating state.

ERUN ET/R

EACC

LED display

(All LED’s color is green)

Figure 2.2 LED’s display and name

Content Displayed

Table 2.1 LED Display Content

LED

Content

ERUN

Indicates whether or not the Ethernet Port is operating normally.

On.... The Ethernet Port is operating normally.

Off.... The Ethernet Port error occurred.

(Ether Run)

ET/R

Indicates whether or not the Ethernet Port is transmitting data or receiving data.

On.... Data transmission or receipt in progress

Off.... Data is not being transmitted or received.

(Ether Transmis-

sion / Receive)

EACC

Indicates whether or not the T2N is accessing the Ethernet Port.

On.... The T2N is accessing the Ethernet Port.

Off.... The T2N is not accessing the Ethernet Port.

(Ether Access)

(2) 10BASE-T connecting connector

This connector is used for connecting 10BASE-T twisted pair cable and Ethernet Port.

See section 3.1, " Connecting to the Network ", for detailed information on connection.

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3. Preparing for Operation (Hardware)

This section presents the Ethernet Port setup.

WARNING

1. Build emergency stop, interlock, and similar circuits outside the PU235N/245N. If a breakdown or

malfunction occurs in the PU235N/245N, there is the danger that someone could be hurt or fatally

injured. Also, other equipment could be damaged or a breakdown could occur.

CAUTION

2. Take all necessary safety precautions before performing operations such as changing a running

program, forcing output, or switching to RUN (operate) or HALT (stop) modes.

Equipment can be damaged and breakdowns can be caused by operating this equipment incorrectly.

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3.1 Connecting to the Network

The Ethernet Port supports 10BASE-T network.

(1) Connection to a 10BASE-T Network

This section describes the connection procedure starting from the state where the 10BASE-T

twisted pair cable is already supplied and ready to be connected. See section 9.2, "Network

Wiring", for details on wiring the 10BASE-T twisted pair cable.

PU235N/245N

Ethernet Port

To HUB

10BASE-T connection

connector

Twisted pair cable

Figure 3.1 Connection to a twisted pair cable

(1) Align the twisted pair cable with the 10BASE-T connector and insert the modular connector.

(2) Pull the 10BASE-T connector and verify that the connector is locked and cannot be pulled

out.

CAUTION

1. When installing a 10BASE5, 10BASE2 or 10BASE-T network, the cabling must be laid with adequate

safety precautions and in accordance with all applicable standards. Installation and wiring should be

performed by a qualified professional.

See the ISO/IEC8802-3 standard for installation environment standards.

Usage Recommendations

1. Do not exceed the maximum cable length (100 m) in systems using 10BASE-T.

2. A HUB and a twisted pair cable are required in systems configured using a 10BASE-T network.

(See section 3.2, "Network Wiring Equipment.")

These parts must be ordered separately if required.

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3.2 Network Wiring Equipment

This section describes the wiring and related equipment that makes up the network to which the

Ethernet Port is connected. Since the Ethernet Port conforms to the ISO 8802-3 (IEEE 802.3)

standard, users should select equipment to be used in the network that also conforms to this

standard.

The following section introduces recommended wiring and related equipment. We strongly

recommend that these models be used when new items are needed.

Contact the manufacturer directly for detailed information on this equipment.

(1) 10BASE-T

Twisted pair cable

Catalog no.

ECM-04-¨¨¨M

¨¨¨:Length(1 to 100)

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

(Enable cross cable)

HUB

Catalog no.

ETH-807B ( 8 ports)

ETH-707A (16 ports)

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

(Enable cross cable)

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(2) 10BASE5

Coaxial cable

Catalog no.

EEA-9202-¨M+TMJ x 2

¨: Length

Standard outside 10.3 mm diameter, with terminators at both ends

diameter

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

Plugs

Catalog no.

EPL-6213

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

Terminators

Adapters

Catalog no.

EEJ-6213

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

Catalog no.

EAD-6213

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

Grounding clamps

AUI cable

Catalog no.

EEL-6213

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

Catalog no.

AUI15-¨M

¨: Length

Standard outside 6.5 mm diameter (thin wire), molded connectors

diameter

Length

1, 2, 3, 5, 10, and 15 meters

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

Catalog no.

AUI50-¨M

¨: Length

Standard outside 10.5 mm diameter (thick wire), molded connectors

diameter

Length

20, 30, 40, and 50 meters

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

MAU

Catalog no.

ETR-6071 02

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

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(3) 10BASE2

Coaxial cable

Catalog no.

RG-58A/U

Standard outside 5.0 mm diameter, with BNC plugs at both ends

diameter

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

BNC plugs

T connectors

Adapters

Catalog no.

EPL-1067

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

Catalog no.

ETS-8191

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

Catalog no.

EAD-8191

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

Terminators

Catalog no.

EEJ-8191

Manufacturer

Showa Electric Wire & Cable Co., Ltd.

CAUTION

1. When installing a 10BASE5, 10BASE2 or 10BASE-T network, the cabling must be laid with

adequate safety precautions and in accordance with all applicable standards. Installation and wiring

should be performed by a qualified professional.

See the ISO/IEC8802-3 standard for installation environment standards.

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4. Preparing for Operation (Software)

This section describes setting up the Ethernet Port software for operation.

CAUTION

1. Chapter 4 presents information related to using the functions provided by the Ethernet Port from a

T2N, including the instruction (request) format, important items that require attention, and sample

programs.

Make a point of understanding the content of chapter 4 thoroughly before writing programs that use

the Ethernet Port. The sample programs present basic examples of Ethernet Port usage, and should

be reviewed carefully before use in an actual system.

4.1 Ethernet Port Setup Flowchart (Software)

This section presents the flowchart for Ethernet Port setup.

Start

There are two ways to reset the Ethernet Port:

Turn on the T2N power.

Apply the reset operation from a user program on the T2N.

For details on these reset operations, see section 4.3, "Ethernet Port

Reset."

Reset the Ethernet Port

The Ethernet Port parameters required for network transmission are

set up by a user program running on the T2N. For details on these

setup operations, see section 4.4, "Parameter Setup Request."

Set up the Ethernet Port

parameters from the T2N.

In this state, the system can handle remote port verification requests.

See section 7.3, "Remote Port Verification Request." In this state, the

system can respond to existence verification requests from other ports.

The Ethernet Port operating mode is set by user programs running on

the T2N. For details on these operations, see section 4.5, "Operating

Mode Control Requests."

Specify the Ethernet Port

operating mode from the

T2N.

In this state, the PC link and computer link protocol transmission

slave port functions are operating.

(Assuming that they have not been explicitly disabled by the

operating mode settings.)

End

Figure 4.1 Ethernet Port Setup Flowchart (Software)

Usage Recommendations

Before performing the settings described in this chapter, register the PU235N/245N as T2N I/O. The I/O

type is ETHER or E/S.

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4.2 Ethernet Port Instruction Specifications

Before discussing the software side of the Ethernet Port setup procedure, this section presents an

overview of the SEND and RECV instructions, which are the instructions that are used to control

the Ethernet Port from T2N user programs. Ethernet Port control and transmission control (PC link

protocol transmission and socket interface transmission) are performed solely using the SEND and

RECV instructions.

See the individual items for details on the actual requests sent to the Ethernet Port.

(1) Instruction format

Figure 4.2 shows the formats of the SEND and RECV instructions.

Input

Output

[ A

S E N D

R E C V

B ]

Input

Output

[ A

B ]

Operand

Name

Device

INDEX

Index

Con-

stant

Transfer parameter

Status

Input

OFF

Operation

Output

ERF

No execution

Execution

OFF

Transmission port instruction busy/instruction execution in OFF

progress (response wait)

Response reception complete (normal complete)

Instruction error

OFF

Figure 4.2 SEND/RECV Instruction Formats

a. ERF is the S0051 special relay. See the T-series Instruction Set for information on ERF

usage.

b. For these instructions, instruction execution starts at the point the input changes state

from off to on.

c. Since these instructions span multiple scans, applications must hold the input in the on

state until the output goes to the on state.

If the input is turned off before the output goes on, the system will not be able to execute the

following instruction processing normally.

d. After instruction execution terminates, it is possible to start execution again by applying a

new input.

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(2) Transfer parameters (A)

The data required for a request to the Ethernet Port is set up in an area that starts in the register

indicated by [A]. Then the application executes a SEND or RECV instruction. Here we present an

overview of the structure of the transfer parameters. Tables 4.1 and 4.2 list the requests that can be

issued to an Ethernet Port.

3100H

CMD

Module designation

A + 1

Command number: Indicates the request type to the Ethernet

Port.

Parameters

A + 2

A + 3

Parameters:

This data differs depending on the type of

the request to the Ethernet Port.

Module designation:

3 (Module ID):

Designates the Ethernet Port mounted in the T2N.

Must be set to 3 for an Ethernet Port.

Must be set to 1 for an Ethernet Port.

This two-digit field must be set to 00.

1 (channel number):

00 (station number):

e. Do not modify the contents of the transfer parameters while an instruction execution is in

progress.

The SEND or RECV instruction may not complete.

Table 4.1 Instructions (Requests) to the Ethernet Port (Part 1)

Request

Function

Instruction

SEND

CMD

Reset request

Resets the Ethernet Port.

Sets up the Ethernet Port parameters.

0011H

0012H

Parameter setup

request

SEND

Operating mode

control request

Sets the operating mode.

SEND

RECV

SEND

RECV

SEND

0013H

0014H

0015H

0018H

0021H

000FH

Remote port

verification request

Verifies the existence of another port on the network.

Reads out the Ethernet Port RAS information.

RAS information

readout request

Time set request

Sets the Ethernet Port internal clock

Time information for event trace (RAS information)

(PC link function) T2N.

•

Remote port loopback Performs a loopback operation with another Ethernet Port on the

request

network.

UDP open request

UDP send request

UDP receive request

UDP close request

Opens a socket interface (UDP).

Sends data from a socket interface in the UDP open state.

SEND

0031H

0032H

0033H

0034H

Reads data received by a socket interface in the UDP open state. RECV

Closes (terminates) a socket interface in the UDP open state. SEND

CMD (command number): Indicates the request type to the Ethernet Port.

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Table 4.2 Instructions (Requests) to the Ethernet Port (Part 2)

Request

Function

Instruction

CMD

TCP open request

Opens a socket interface (TCP).

SEND

RECV

0035H

TCP send request

Sends data from a socket interface in the TCP open state.

0037H

0038H

TCP receive request Reads data received by a socket interface in the TCP open

state.

TCP close request

Closes (terminates) a socket interface in the TCP open state.

SEND

0039H

CMD (command number): Indicates the request type to the Ethernet Port.

f. Items ¬ to ® are CMD classes. Class ¬ is Ethernet Port control, • is PC link protocol

transmission, and ® is socket interface transmission.

For a single Ethernet Port, it is not possible to request another class ¬ CMD while a

class ¬ CMD is executing. This is also true for class • CMDs. If such a request is

issued, the status (described in the following status information) will be transmission port

busy, and the request will go to the wait state.

For a single Ethernet Port, when requesting a class ® CMD, it is not possible to request

another class ® command for a socket for which an instruction is executing. If such a

request is issued, the status (described in the following status) will be transmission port

busy, and the request will go to the wait state.

There are eight sockets, and each can independently accept and execute a class ®

instruction.

g. If the T2N switches from the run to the halt state and then back to the run state while an

instruction is executing, it is possible that the Ethernet Port could execute the request issued

immediately prior to the halt state. This section describes the handling required after

returning to the run state.

The T2N should always set the Ethernet Port to standby mode after the T2N returns to

run mode. (See 4.5.) Setting the Ethernet Port to standby mode causes all the requests

issued to the Ethernet Port to be discarded, computer link and PC link protocol

transmissions to be stopped, and the socket interface to be initialized, i.e. set to the

closed state.

Before setting the Ethernet Port to standby mode, verify the operating mode (See 4.5.)

with the Ethernet Port station status. (See section 7.1.) If the Ethernet Port is in run

mode, set it to standby mode. However, if it is in standby mode, there is no need to set it

to standby mode again.

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(3) Status (B)

The status during the execution of a SEND or RECV instruction and after that instruction

terminates is stored in the register shown at B. When TermSTS = 0BH, the detailed information

(Ethernet Port error information) will be loaded into the registers indicated at location B + 1.

Figure 4.3 shows the structure of the status information. Tables 4.3 and 4.4 list the TermSTS

values, and table 4.5 and 4.6 lists the contents of the detailed information.

Status

B+1

Detailed information

Sport NO

TermSTS

Only on an error 0: Error occurred at local station.

1: Error occurred at remote station.

Socket identifier: Only valid for socket interface transmission

instructions. ("0" for other instructions)

status 0: Initial state

busy 0: Initial state

1: Transmission port busy

1: While send requesting

2: Send complete and while waiting

response

abn 0: Normal complete

1: Error complete

3: Complete

Figure 4.3 Status Structure

h. The user program must set bits C and D to 0 before first activating a SEND/RECV

instruction. Failure to do so will cause the SEND/RECV instruction to not complete.

Also, do not write to the status during instruction execution. This will cause the

SEND/RECV instruction to not complete.

i. When the number of SEND/RECV instructions are used in the user program and their

instructions are executed simultaneously, separate the status and detailed information

Table 4.3 TermSTS (Part 1)

TermSTS Status

Meaning

00H

01H

Normal complete

•

Occurs if a register other than XW, YW,W, LW, RW, D, F, T, C, or SW is

specified as the data storage register in one of the following requests.

Requests: RAS information readout, remote port loopback, UDP send/receive,

TCP send/receive, register read/write.

•

In a register read or write request, the request specified a read or write from a

T register to a register other than a T register.

(This also applies to C registers.)

02H

Response timeout

Occurs if a response is not received within the specified time for a remote port

loopback or register read/write request.

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Table 4.4 TermSTS (Part 2)

Meaning

TermSTS Status

03H Parameter error

•

Occurs if a value other than 3 is specified for the module ID.

Occurs if a value other than 1 is specified for the channel number.

Occurs if a command number other than one of the following is specified for a

SEND instruction.

000FH, 0011H - 0014H, 0018H, 0021H, 0031H, 0032H, 0034H, 0035H,

0037H, 0039H

•

Occurs if a command number other than one of the following is specified for a

RECV instruction.

0015H, 0021H, 0033H, 0038H

•

Occurs if a value other than 1 to 8 is specified for the socket identifier.

(See section 6.4 "Using the Ethernet Port Socket Interface".)

Occurs if an incorrect parameter is specified in a RAS information readout

request.

(See section 7.6 "RAS Information Readout ".)

04H

Memory write protect

(Reserved)

•

Occurs if an attempt to write is made when the remote registers were write

protected.

Occurs if an attempt to read is made when the local registers were write

protected.

05H

06H

Module error

•

Occurs if the Ethernet Port is down.

Occurs if the Ethernet Port is initializing.

Occurs if a T2N internal timer times out.

Requests: UDP open, UDP send, UDP close, TCP send, TCP close

Initialization in progress

Transmission complete

timeout

07H

08H

No send channel (CH)

•

Occurs if the corresponding Ethernet Port is not installed.

Port address out of range

Occurs if the local port IP address was specified for the remote destination IP

address.

Requests: Remote port loopback, register read/write

09H

0AH

Incorrect transmission word

count

•

Occurs if either 0 words or 486 or more words were specified for either a

Occurs if either 0 words or 1001 or more words were specified for a UDC/TCP

send/receive request.

Boundary error

•

Occurs if the specified area (start address + register range) does not exist in

the T2N data storage registers.

Requests: RAS information readout, remote port loopback, UDP send/receive,

TCP send/receive, register read/write

0BH

0CH

Transmission error

•

Occurs if the Ethernet Port returns an error response.

Detailed information (the Ethernet Port response status) is stored at B+1.

No I/O response

(Reserved)

Occurs if the T2N cannot access the Ethernet Port.

0DH

0EH

Send data capacity

exceeded

•

Occurs if a request is discarded when a T2N internal resource insufficiency

occurs due to increasing amounts of transfer data.

Occurs if a T2N retransmission times out.

0FH

(Reserved)

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Table 4.5 Detailed Information (Ethernet Port Error Responses) PART1

Code

Error

Description

Normal complete

Local port fault

Local port standby

0001H Request completed normally

0002H The local port is in down mode

0003H In standby mode data transmission (socket interface transmission or PC link

protocol transmission) was requested.

Timeout

0020H Timeout occurred during TCP open processing or receive processing, or during

UDP receive processing.

Length error

0030H Incorrect send data length

Port mode error

0040H One of the following requests was issued in a mode other than standby mode:

a. Parameter setup, b. MAC address setup, c. Reset

MAC/IP not set up

0050H

Occurs if the MAC address or IP address is not set up.

Transmission prohibited state

0060H • Occurs if a PC link request was issued from the T2N in run mode in the

message transmission prohibited state.

• Occurs if a socket open, close, send, or receive request is issued by the T2N

in run mode in the socket interface transmission prohibited state.

Format error

0070H Occurs when there is a format error in the request text.

0071H Port number error

0072H Request code error

0073H Time setting: Year

0074H Time setting: Month

0075H Time setting: Day

0076H Time setting: Hour

0077H Time setting: Minute

0078H Time setting: Second

Opened

0080H Occurs if an open request is issued for an already open socket.

Unopened

0081H • Occurs if send, receive, or close request is issued for an unopened socket.

• Occurs if send, receive request is issued for TCP socket during receiving

CLOSE request (RCLOSE bit is 1).

Incorrect socket identifier

0082H Occurs if the socket identifier is out of range (1 to 8).

Incorrect control request

specification

0083H Occurs if a request that was prohibited by an operating mode control request is

issued.

• Occurs if a run request is issued in run mode.

• Occurs if a standby request is issued in standby mode.

• Occurs if a run request and a standby request are issued at the same time.

LAN controller driver error

0090H Occurs if the setting of the local port IP address and port number in the area

reserved for transmission fails.

0091H • Error in the TCP or UDP protocol (such as a transmission phase error)

• Occurs if send request is issued for TCP socket that remote port is down and

NOACK bit is 1.

0092H • Occurs if the setting of the remote port IP address in the remote port

information area (the NETDATA table) fails.

• Occurs if the remote port IP address network address differs from the local

port IP address network address.

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Table 4.6 Detailed Information (Ethernet Port Error Responses) PART2

Code

Error

Description

Memory pool allocation failure

Port 2 task start failure

Broadcast specification error

00A0H Occurs if the Ethernet Port internal OS fails to allocate memory.

00A1H Occurs if computer link or PC link socket identifier acquisition fails.

00A2H Occurs if the remote IP address is broadcast on a remote port verification

request.

MAC address specification error 00B0H BCC error

00B1H

00C0H

00C1H

Occurs if an error occurs after address saving on a MAC setup request.

Occurs if send request is issued for the Ethernet Port internal buffer fill.

The specifiable size from user program

Resource shortage error

Receive request from the T2N

< The Ethernet Port is receiving data size

00C2H

The specifiable size of user program beyond the limits from 1 to 1000.

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4.3 Ethernet Port Reset

This section describes the Ethernet Port reset procedures. There are two ways to reset an Ethernet

Port as follows:

(1) T2N power on

(2) Reset by a user program running on the T2N

In Ethernet Port reset processing, when one of the above resets occurs, the Ethernet Port first

performs the self check described below. If the self check completes normally, the Ethernet Port

switches to standby mode (the parameter setting wait state), thus completing the reset sequence. If

an error is discovered during the self check, the Ethernet Port goes to the down state.

Ethernet Port self check items

System ROM check

System RAM check

LAN controller check

T2N interface buffer memory check

EEPROM check

See section 4.5, "Operating Mode Control Requests", for more information on the Ethernet Port

operating modes.

(1) T2N power on

When power is applied to the T2N, power is also applied to the Ethernet Port, and the

PU235N/245N performs its reset processing sequence.

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(2) Reset request from the T2N

It is possible to initiate reset processing from user programs on the T2N. T2N can execute the reset

processing instruction on standby mode (See section 4.5). This section describes the format of the

reset processing instruction.

Reset request (using the SEND instruction)

a. Function

Reset request from a user program to an Ethernet Port.

b. Transfer parameters

Module designation

CMD number

3100H

A+1

CMD = 0011H

c. Status (See figure 4.3 for details on bits C, D, E and F.)

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

d. Important items

An error will occur if the Ethernet Port is in run mode or down mode.

Run mode - Status: Transmission error (TermSTS = 0BH)

Detailed information: Port mode error (0040H)

Down mode - Status: Module error/initialization in progress (TermSTS = 06H)

e. Sample program

This sample ladder program issues a reset request to the channel 1 Ethernet Port.

This program is executed by turning on the R0501 A contact.

Parameters: 12544:3100H, 00017:0011H

|R0501

R0601 |

1|-| |-----------------------------------------------------------( )--|

/* Reset request

|R0601

2|-| |-+[ 12544 MOV RW000][ 00017 MOV RW001]--------------------------|

/* Designates the module and sets the CMD number. */

+[RW000 SEND RW010][ RST R0501]--------------------------------|

/* Sets the request.

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4.4 Parameter Setup Request

This section describes the procedure for Ethernet Port parameter setup in the Ethernet Port from a

T2N user program. The Ethernet Port parameters consist of the following:

(1) Local port IP address

(2) UDP port number for computer link and PC link transmission

Here we first describe the IP address, subnet mask, and port number, which are the parameters

required for TCP/IP and UDP/IP transmission.

(1) IP address

The IP address is the address that specifies a particular port when transmitted data using the IP

(internet protocol). Therefore IP addresses must be set and managed so that they are not

duplicated. The following presents an overview of IP addresses.

a. IP address format

An address consists of a network address and a host address. The network address is an address

that specifies a particular network, and the host address is an address that specifies a particular

port on that network. The same network address must be assigned to all ports on the same (i.e., any

given) network.

An IP address is a 32-bit data item. IP addresses are written as the decimal values of each byte in

the 32-bit datum, with the decimal values separated by dots.

Example: 11000000 00000000 00000000 00000001 ® 192.0.0.1

IP addresses are divided into five classes, A through C, according to how many bits in the 32-bit

value are used as the network address. (The networking standards also define classes D and E, but

the Ethernet Port does not support them.) Figure 4.4 shows the classes A though C.

Class A

Class B

Class C

Network: 7

Host: 24 bits

• 127 values (networks)

• 16,777,214 values (hosts)

1 0

Network: 14 bits

Host: 16 bits

• 16384 values (networks)

• 65534 values (hosts)

1 1 0

Network: 21 bits

Host: 8 bits

• 2,097,152 values (networks)

• 254 values (hosts)

Figure 4.4 IP Address Class Divisions

In this system, networks with a large number of connected ports use class A addresses and

networks with s small number of connected ports use class C addresses. Class B addresses are

used for networks that fall between classes A and C. Expressed in decimal, the first byte of the

class A through C networks will be: 0 to 127 for class A, 128 to 191 for class B, and 192 to 223

for class C.

b. IP address acquisition

Taking future uses into account, we strongly recommend acquiring an official IP address.

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c. Notes on IP addresses

The following IP addresses cannot be used with the Ethernet Port, both for the local port and for

remote port addresses.

Addresses starting with 127 (7FH).

Addresses in which the network address is all zeros or all ones.

Addresses in which the host address is all zeros or all ones.

d. Broadcast addresses

The only broadcast address that can be used with the Ethernet Port is 255.255.255.255

(FF.FF.FF.FF).

The broadcast address 0.0.0.0 used on some UNIX systems (4.2 BSD) cannot be used.

UNIX is an operating system used on engineering workstations (EWS) and other computers. There are

several versions of UNIX, including ones developed by AT&T Bell Laboratories Inc., and ones

developed by the University of California at Berkeley. In particular, 4.2 BSD is a version developed at

Berkeley.

(2) Subnets and the subnet mask

One technique for managing a network with a large number of ports is to divide that network into

multiple subnets. A subnet operates by taking some number of bits in the host address of the IP

address for each class, and using those bits as a subnetwork address. This allows the installation to

operate the network internally as multiple subnetworks, while the network is recognized externally

as a single network.

The subnet mask is used to determine how many bits of the host address to allocate as the subnet

address. In the subnet mask, the network address field and the subnetwork address field are set to 1

and the remaining field (the subnet host address field) is set to 0.

Example: When a subnetwork address field of 12 bits is used in a class A IP address.

1111 1111 1111 1111 1111 0000 0000 0000 (FFFFF000)

Network

address field

Subnetwork

address field

Host address

field

When a subnet mask is used, all ports on the subnetwork must use the same subnet mask.

In the Ethernet Port, the subnet mask cannot be set by the user. The subnet masks (with the

network address field filled with ones) for each class are generated automatically as shown in table

4.7 from the specified IP address.

Table 4.7 Relationship between the Local IP Address

and the Generated Subnet Mask on the Ethernet Port

Local IP Address

Subnet mask

class A

class B

class C

255.0.0.0 (FF000000)

255.255.0.0 (FFFF0000)

255.255.255.0 (FFFFFF00)

Usage Recommendations

1. The PU235N/245N does not allow the user to set the subnet mask. Therefore the Ethernet Port

cannot be used in systems that operate a subnetwork.

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(3) Port number

An IP address identifies a particular port on a network. However, since, on any given port, there

will be multiple applications using TCP/IP or UDC/IP to communicate with applications on other

ports, the question of to which application the data should be passed arises.

UDP ports have the role of acting as the point of contact between UDP and applications that

transfer data using UDP. UDP ports are managed using port numbers. In the same manner, TCP

uses TCP ports.

The combination of a port number and an IP address is called a socket. The Ethernet Port

transmits data to or from other ports using these sockets in the computer link protocol, the PC link

protocol, and in socket interface transmission.

The range of port numbers that can be used with the Ethernet Port is from 1024 to 65535,

for both TCP and UDP. This is because UNIX allocates port numbers 1 to 1023 for standard

services.

However, note that the same port number cannot be used for both TCP and UDP on the

Ethernet Port.

The following section describes the format of the parameter setup request.

Parameter setup request (using the SEND instruction)

a. Function

This is a request from a user program that sets up the Ethernet Port parameters in an Ethernet Port

in standby mode.

b. Transfer parameters

3100H

Module designation

CMD number

A+1

A+2

A+3

A+4

CMD = 0012H

Local port IP address for the

Ethernet Port

UDP port number for message

UDP port number used for computer link or PC

link protocol transmission.

IP address setup procedure: For the address 133.113.90.10

85H. 71H. 5AH. 0AH

8 7

A+2

A+3

71H

0AH

85H

5AH

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Message transmission UDP port number

As described in chapter 1, UDP/IP is used for both computer link and PC link protocol

transmission, which are collectively referred to as message transmission. These techniques use

dedicated UDP sockets that are separate from those used by socket interface transmission.

Set the port number to a value in the range 1024 to 65535. (UNIX allocates port numbers 1

to 1023 for standard services.)

The UDP port number specified at A+4 is the UDP port number allocated for message

transmission (receive). The two port numbers following that port number are automatically

allocated for message transmission (send). If computer link protocol/PC link protocol reception

is performed directed at the message transmission UDP port number specified at A+4, the

Ethernet Port/T2N will process the received data in the order received and send the result from

one of the message transmission send ports. (See figure 4.5.)

Ethernet Port

Message transmission receive port

(port number 2000)

Computer link/

PC link protocol transmission

Message transmission send port 1

(port number 2001)

Computer link protocol transmission

Message transmission send port 2

(port number 2002)

PC link protocol transmission

Figure 4.5

Relationship between Message Transmission Send

and Receive Port Numbers

As mentioned in the section on socket interface transmission, UDP port numbers used for message

transmission must not duplicate UDP socket port numbers or TCP socket port numbers.

c. Status (See figure 4.3 for details on bits C, D, E and F.)

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

d. Important items

An error will occur if the Ethernet Port is in run mode or down mode.

Run mode - Status: Transmission error (TermSTS = 0BH)

Detailed information: Port mode error (0040H)

Down mode - Status: Module error (TermSTS = 06H)

An error occurs if a UDP port number is set to a value outside the range 1024 to 65535.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Port number error (0071H)

e. Sample program

This sample ladder program issues a parameter setup request to the channel 1 Ethernet Port.

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This program is executed by turning on the R0502 A contact.

Parameters: 12544:3100H, 00018:0012H

29061:7185H, 02658:0A62H

|R0502

R0602 |

1|-| |-----------------------------------------------------------( )--|

/* Parameter setup request */

|R0602

2|-| |-+[ 12544 MOV RW000][ 00018 MOV RW001]--------------------------|

/* Designates the module and sets the CMD number. */

+[ 29061 MOV RW002][ 02658 MOV RW003][ 01025 MOV RW004]--------|

/* Sets the IP address, Port number. */

+[RW000 SEND RW010][ RST R0502]--------------------------------|

/* Sets the request.

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4.5 Operating Mode Control Requests

This section describes the Ethernet Port operating modes and the procedures for controlling the

Ethernet Port operating mode from user programs on the T2N.

The Ethernet Port has the following operating modes:

(1) Initialization mode

This mode indicates that the Ethernet Port is executing reset processing.

If reset processing completes normally, the Ethernet Port switches to standby mode.

If reset processing exits with an error (e.g., if a self test error occurs) the Ethernet Port

switches to down mode.

During initialization, the Ethernet Port cannot execute requests from T2N user programs.

(2) Standby mode

In this mode, Ethernet Port parameter can set up.

Ethernet Port parameters cannot be set up in any mode other than standby mode.

After the Ethernet Port parameters have been set up, the Ethernet Port can be switched to run

mode by T2N user program instructions.

(3) Run mode

In this mode, the Ethernet Port can communicate with other ports.

The Ethernet Port can be switched to standby mode by T2N user program instructions.

In run mode, transfers using computer link/PC link protocol and transfers using the socket

interface can be independently enabled or disabled.

(4) Down mode

This mode indicates that the Ethernet Port is in an unrecoverable error state.

Once the Ethernet Port enters the down state, it can only be restored by turning the power off

(power cycling) and then on again.

The details of the down mode state can be verified by reading the data in the T2N interface

buffer memory.

(See chapter 7, "RAS Information.")

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Figure 4.6 shows the Ethernet Port mode transitions.

Power down

Power applied

Self check completes normally

Initialization

Standby

Reset request

Power on/off/on

cycle

Standby request

Self check terminates

in an error state.

Run request

Unrecoverable error

Down

Run

Figure 4.6 Ethernet Port Mode Transitions

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This section describes the operating mode control request instruction format.

Operating mode control request (using the SEND instruction)

a. Function

This is a request from a user program that controls the Ethernet Port operating mode.

b. Transfer parameters

3100H

Module designation

CMD number

A+1

A+2

CMD = 0013H

Specified information

STBY

MTEN

RUN

STEN

Bit D: STBY (standby request)

Switches the Ethernet Port from run mode to standby mode.

Bit C: RUN (run request)

Switches the Ethernet Port from standby mode to run mode.

Bit 5: MTEN (message transmission enable/prohibit request)

Computer link/PC link protocol transmission enable/prohibit

1: Enable, 0: Prohibit

Bit 4: STEN (socket interface transmission enable/prohibit request)

Socket interface transmission enable/prohibit

1: Enable, 0: Prohibit

Examples: Standby request - 2000H

Run request - 1030H (Allows both message transmission and socket interface

transmission)

1010H (Allows socket interface transmission only)

1020H (Allows message transmission only)

c. Status (See figure 4.3 for details on bits C, D, E and F.)

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

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d. Important items

Values other than 1010H, 1020H, 1030H, and 2000H may not be specified for the

specification information.

® Status: Transmission error (TermSTS = 0BH)

Detailed information: Incorrect control request specification (0083H)

Simultaneous run mode and standby mode requests (30x0H) cannot be executed.

® Status: Transmission error (TermSTS = 0BH)

Detailed information: Incorrect control request specification (0083H)

A mode that has already been established cannot be requested. However, requests that change

the MTEN/STEN state within the same mode do not cause an error.

® Status: Transmission error (TermSTS = 0BH)

Detailed information: Incorrect control request specification (0083H)

No execution is possible in down mode.

® Status: Module error/initialization in progress (TermSTS = 06H)

An error occurs if a control request that switches the Ethernet Port to run mode is issued

without first setting the IP address.

® Status: Transmission error (TermSTS = 0BH)

Detailed information: MAC/IP not set up (0050H)

e. Sample program

This sample ladder program issues a operating mode control request to the channel 1 Ethernet Port.

This program is executed by turning on the R0503 A point.

Parameters: 12544:3100H, 00019:0013H

04144:1030H

|R0503

R0603 |

1|-| |-----------------------------------------------------------( )--|

/* Control request

|R0603

2|-| |-+[ 12544 MOV RW000][ 00019 MOV RW001]--------------------------|

/* Designates the module and sets the CMD number. */

+[ 04144 MOV RW002]--------------------------------------------|

/* Setup specified information. */

+[RW000 SEND RW010][ RST R0503]--------------------------------|

/* Sets the request.

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5. Computer Link Protocol and the PC Link

Protocol Transmission

CAUTION

1. Chapter 5 presents information related to using the functions provided by the Ethernet Port from a

T2N, including the instruction (request) format, important items that require attention, and sample

programs.

Make a point of understanding the content of chapter 4 thoroughly before writing programs that use

the Ethernet Port. The sample programs present basic examples of Ethernet Port usage, and should

be reviewed carefully before use in an actual system.

This chapter describes computer link protocol transmission from a host computer and PC link

protocol transmission with the T2N.

5.1 Computer Link Protocol Transmission

The T series computer link protocol transmission was developed by Toshiba for use in controlling

the PROSEC-T Series programmable controllers. A host computer can, with respect to a T2N,

upload or download user programs, issue control commands, or read and write register data using

the T series computer link protocol.

When a T2N and a host computer communicate over an Ethernet Port using the computer link

protocol, they use UDP/IP as the transmission protocol.

When a host computer transmits to a T2N using computer link protocol, the host computer's UDP

socket is used. (Socket refers to the combination of an IP address and a port number.) The host

computer sends commands and data from its own UDP socket to the Ethernet Port message

transmission UDP socket.

When the T2N uses computer link protocol transmission, it simply performs the:

Parameter setup (IP address and the UDP port number for message transmission) and

Operating mode control (message transmission permission)

that were described in an earlier chapter. There is no need to create any special user programs on

the T2N.

See the T Series Computer Link Operation Manual (UM-TS03***-E008) for details on the

functions, specifications, and usage of T series computer link protocol transmission.

Usage Recommendations

1. Since UDP/IP does not provide control functions to guaranteed communication reliability, higher

level protocols (such as retry) are required.

2. No processing is performed if a computer link protocol transmission message is received at any

point other than a message transmission UDP socket.

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5.2 Sample Computer Link Protocol Program

This section presents a sample program that runs on the host computer (a personal computer or

workstation) and that uses computer link protocol transmission.

This program issues a read/write request for 32 words from the start of the T2N D registers.

Operating environment

Hardware: Toshiba J-3100PV

3Com Etherlink III (3C509/B)

PC-NFS Pro 1.1.1.0

Microsoft VisualC++ 1.0

Software:

Transfer parameters

Local IP address:

133. 113. 98. 200

3001

Local UDP port number:

Remote IP address:

133. 113. 98. 10

Remote UDP port number: 3001

/**********************************************************************/

SAMPLE.H

Write and read requests can be issued to other T2N units

by modifying this definition file.

/**********************************************************************/

/*---------------------------*/

/* Definition declarations

/*---------------------------*/

#define MY_PORT 3001

#define DST_PORT 3001

/* Local port number

/* Remote port number

/* Remote IP address

#define DST_IP

#define LOOP

"133.113.98.10"

/* Data transmission execution count */

/* Data length */

#define DATASIZ

/* Computer link function = word units */

/* RECVFROM timeout time */

#define RECVTOUT 30

#define REG_TYPE "D"

/* Register type

#define REG_ADR

"0000"

/* Register start address */

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/**********************************************************************/

Sample program implementing register read and write processing

using the computer link protocol.

This program is a sample program designed to verify the T2N

Ethernet port computer link function.

This program issues read and write requests to the specified

T2N registers.

Also note that registers in other ports can be accessed by

modifying the SAMPLE.H definition file.

/**********************************************************************/

/*---------------------------*/

/* Include declarations

/*---------------------------*/

#define WIN31

/* This is a Windows 3.1 application. */

/* The COMM API is required. */

#define USECOMM

#include <string.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <memory.h>

#include <sys¥types.h>

#include <fcntl.h>

#include <errno.h>

#include <sys¥socket.h>

#include <sys¥timeb.h>

#include <time.h>

#include <sys¥in.h>

#include <sys¥netdb.h>

#include "sample.h"

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/*---------------------------*/

/* Prototype declarations */

/*---------------------------*/

int cl_send( int );

/* Register read/write processing */

void main()

{

int

ists;

/* Return status

/* Socket identifier */

/* Loop counter */

isdp ;

;

struct sockaddr_in

Soc;

WORD wVersionRequested = (0,1);

WSADATA WsaDtata ;

/* WINSOC version number specification */

/* WINSOC data structure

/* initialization

ists = 0 ;

/* Initial value setting

/* Windows socket initialization */

ists = WSAStartup( wVersionRequested, &WsaDtata ) ;

if( ists == 0 ){

/* If normal return:

isdp = socket(AF_INET, SOCK_DGRAM, 0);

if( isdp != INVALID_SOCKET ){

Soc.sin_family = AF_INET;

Soc.sin_addr.s_addr = 0 ;

/* Create socket (UDP) */

/* If normal return:

/* Set local IP address.

Soc.sin_port = htons( MY_PORT ); /* Set local port number. */

/* Execute bind processing. */

ists = bind(isdp, (struct sockaddr *)&Soc, sizeof(Soc) );

if( ists != SOCKET_ERROR ){

for( i = 0; i < LOOP; i++){

/* If bind completed normally: */

/* Loop for the specified number

of times. */

ists = cl_send( isdp );

if( ists != 0 )

/* Register read/write processing

/* If an error occurred in

break ;

/* Terminate processing.

}

closesocket( isdp ) ;

/* Socket close processing

}

WSACleanup() ;

}

/* Report WINSOC termination. */

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/* SLW */

/**********************************************************************/

cl_send - Register read/write processing

/**********************************************************************/

Calling sequence

cl_send();

/* Arguments: Isdp

: int

: socket identifier

: return status

ists

/**********************************************************************/

int cl_send( int Isdp )

{

int

j, k

ists = 0 ;

iret

;

/* Loop counter

/* Return status

;

ircvsiz ;

isndsiz ;

/* Reception data length */

/* Data length

icunt

idat

;

/* Data setup index

/* Temporary

char csnd[ 1000 ] ;

char crcv[ 1000 ] ;

fd_set ibits;

/* Data send buffer

/* Data receive buffer

/* SELECT() bit mask

struct timeval timeout;

/* SELECT() timer value */

struct sockaddr_in

Snd, Rcv;

iret = -1 ;

memset( &Snd, 0x00, sizeof( Snd ) );

memset( &Rcv, 0x00, sizeof( Rcv ) );

memset( csnd, 0x00, sizeof( csnd ) );

/* Clear the send data buffer.

memset( crcv, 0x00, sizeof( crcv ) );

/* Clear the receive data buffer.

/* Set up the register write send data.

sprintf( &csnd[ 0 ], "(A01DW" ) ; /* Set up the register write command.

/* Set the starting register number.

sprintf( &csnd[ strlen(csnd)], "%s", REG_TYPE );

sprintf( &csnd[ strlen(csnd) ], "%04s", REG_ADR );

sprintf( &csnd[ strlen( csnd) ], "," ) ;

idat = DATASIZ ;

/* Set the data count. */

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sprintf( &csnd[ strlen( csnd ) ], "%02d", idat ) ;

sprintf( &csnd[ strlen( csnd) ], "," ) ;

icunt = 0 ;

/* Comparison data storage index. */

for( j = 0, k = 0; k < DATASIZ; k++ ){ /* Set register write data. */

sprintf( &csnd[ strlen( csnd) ], "%04X", k ) ;

j = j + 4 ;

sprintf( &csnd[ strlen( csnd) ], "," ) ;

j = j + 1 ;

icunt = icunt + 4 ;

}

sprintf( &csnd[ (strlen( csnd )) - 1], ")¥r" ) ;

isndsiz = strlen( csnd );

Snd.sin_family = AF_INET;

/* Set the send data length.

Snd.sin_addr.s_addr = inet_addr( DST_IP ); /* Set the remote IP address.

Snd.sin_port = htons( DST_PORT );

/* Set the remote port number.

/* Send a register write request.

ists = sendto( Isdp, csnd, isndsiz, 0,

(struct sockaddr *)&Snd,sizeof( Snd ) );

if ( ists == isndsiz ){ /* If the send length was OK. */

/* Set the SELECT argument.

memset(&ibits,0x00,sizeof(fd_set));

/* Set the BIT initial value. */

timeout.tv_sec = RECVTOUT;

FD_SET(Isdp,&ibits);

/* Set the timeout time. */

/* BIT setup */

ists = select( 1, &ibits,0,0,(struct timeval *)&timeout);

if(ists > 0){ /* If normal return: */

/* Register write response reception */

ists = recvfrom( Isdp, crcv, sizeof( crcv ), 0

,(struct sockaddr *)&Rcv, &ircvsiz) ;

if ( ists > 5 ){

if( crcv[ 4 ] == 'C' && crcv[ 5 ] == 'E' ||

crcv[ 4 ] == 'E' && crcv[ 5 ] == 'E' ){

return( -1 ) ;

/* Register write response error */

}

/* Register read request creation */

memset( csnd, 0x00, sizeof( csnd ) ) ;

memset( crcv, 0x00, sizeof( crcv ) ) ;

sprintf( &csnd[ 0 ] , "(A01DR" );/* Register read command setup

/* Set up the starting reg. no.

sprintf( &csnd[ strlen(csnd)], "%s", REG_TYPE );

sprintf( &csnd[ strlen(csnd) ], "%04s", REG_ADR );

sprintf( &csnd[ strlen( csnd) ], "," ) ;

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/* Set the data count.

idat = DATASIZ ;

/* Register read data length. */

sprintf( &csnd[ strlen( csnd ) ], "%02d", idat ) ;

sprintf( &csnd[ strlen( csnd )], ")¥r" ) ;

isndsiz = strlen(csnd) ;/* Set up the data transmission length.

/* Send the register read command.

ists = sendto( Isdp, csnd, isndsiz, 0,

(struct sockaddr *)&Snd,sizeof( Snd ) );

if( ists == isndsiz ){

/* Set the BIT initial value. */

memset(&ibits,0x00,sizeof(fd_set));

timeout.tv_sec = RECVTOUT;

/* Set the timeout time. */

/* BIT setup */

FD_SET(Isdp,&ibits);

ists = select( 1, &ibits,0,0,

(struct timeval *)&timeout);

if(ists <= 0){ /* If timeout and error: */

return( -1 ) ; /* recvfrom timed out. */

}

/* Register read response reception

ists = recvfrom( Isdp, crcv, sizeof( crcv ), 0

,(struct sockaddr *)&Rcv, &ircvsiz) ;

if ( ists > 5 ){

if( crcv[ 6 ] == 'C' && crcv[ 7 ] == 'E' ){

iret = -1 ;

/* Register read response error

}

else{

iret = 0 ;

/* Register read response was normal. */

}

return( iret ) ;

}

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5.3 PC Link Protocol Transmission (Data write)

The T series PC link protocol allows one T2N on a network to write register data to another T2N

or T3H.

As is the case with the computer link protocol, the PC link protocol uses UDP/IP as its

transmission protocol.

The PC link main port uses a UDP socket for message transmission and transmits to the slave

Ethernet Port message transmission UDP socket. The user program that runs on the T2N of the

main port is discussed later.

When this function is used on the PC link slave port, the T2N simply performs the:

Parameter setup and

Operating mode control (message transmission permission)

that were described in an earlier chapter. There is no need to create any special user programs on

the T2N.

Usage Recommendations

1. Since UDP/IP does not provide control functions to guarantee communication reliability, higher level

protocols (such as retry) are required.

2. No processing is performed if a PC link protocol transmission message is received at any point

other than a message transmission UDP socket.

a. Function

The register data specified by the local port (T2N) is written to the specified register on the remote

port (T2N or T3H).

b. Transfer parameters

3100H

CMD = 0021H

WordSize

SRID

Module designation

A+1

A+2

A+3

A+4

A+5

A+6

A+7

A+8

A+9

A+10

Command number

(1) Transfer register data length: 1 to 485 words

(2) Local port register type code

(3) Local port register number

(4) Remote port register type code

(5) Remote port register number

(6) Timer count

SRegNO

DRID

DRegNO

Timecnt

D-IPAddress

Remote port IP address (The input format is the

same as that for parameter setup requests.)

D-UDP PortNO

Remote port message transmission UDP port

number

(1) Transferred register data length

Specifies the transmission data length in word units. (1 to 485 words)

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For the T/C registers, the data length will be between 1 and 323 words.

(2) Local port register type code

This code indicates the type of register in which the local port transmission source data is

stored. See figure 5.1 for the codes that can be specified.

(3) Local port register number

Specifies the starting number of the register specified by the local port register type code.

(4) Remote port register type code

This code specifies the type of the register at the remote port to which the transmitted data will

be written. See figure 5.1 for the codes that can be specified.

(5) Remote port register number

Specifies the starting number of the register specified by the remote port register type code.

(6) Timer count

Specifies a time used to limit the response time from the remote port in 0.1 second units.

A+10

0: Use the user-specified value (0.1 to 3276.7 seconds)

1: Use the default value of 30 seconds.

Figure 5.1 indicates the register type code that the local or remote port can specify the code. See

“T-series Instruction Set (Ladder, SFC)” (UM-TS03***-E004).

RID

Meaning

RID

Meaning

0000H

0001H

0002H

0003H

0004H

XW/YW registers

W register

F register (0 - 8191)

F register (0 - 65535)

T register

**05H

**06H

0007H

0008H

0009H

LW register

RW register

D register

C register

SW register

Figure 5.1 Register Type Code

*1 Includes the expansion F registers. One bank has 8k words (0 to 8191).

05H

Bank number ...00H: T2N internal registers

F0000 to F1023

01H to 03H: Expansion F registers

F0000 to F8191

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*2 Includes the expansion F registers(Only T3H). One bank has 64K words (0 to 65535).

Bank number ...00H: T3H internal registers

F0000 to F32767

01H: Expansion F registers (IC card)

F0000 to F65535

02H: Expansion F registers (IC card)

F0000 to F57343

*3 The T and C registers hold data that has flags attached.

Supplement:

The transfer data length has a maximum of 323 words when data is transferred over the

Ethernet.

For the T registers, it is not possible to specify a range that spans both the basic T

registers (0 to 511) and the expansion T registers (512 to 999). The T3H has the expansion

T register, but the T2N does not have.

c. Status (See figure 4.3 for details on bits C, D, E and F.)

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

d. Important items

The write operation is not synchronized with the remote port T2N/T3H scan operation.

If synchronization is necessary, applications must perform synchronization processing, such as

transferring the data to a separate registers at the start of the T2N scan.

The command number (0021H) is the same as the "Data Read".

A transfer word count error (TermSTS = 09H) occurs if the transferred register data length

exceeds the range 1 to 485 words (or 1 to 323 words for the T and C registers).

A register specification error (TermSTS = 01H) occurs if a value other than a stipulated value

is specified for the register type codes (SRID/DRID).

A register specification error (TermSTS = 01H) occurs if 0007H (the T register) is specified

for the local port register type code and a register other than the T register is specified for the

remote port register type code. This also holds for the C register.

A boundary error (TermSTS = 0AH) occurs if a range spanning both the base T registers (0 to

511) and the expansion T registers (512 to 999) is specified for the T register.

For data storage registers, a boundary error occurs if the specified area (start register + register

range) does not exist in either the local or remote ports.

Local port: TermSTS = 0AH, remote port: TermSTS = 8AH

A response timeout error (TermSTS = 02H) occurs if the response time from the remote port

exceeds the time specified by the timer counter value.

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Write protection can be specified for each register type on the local T2N by using the special

coil settings described below. In this case, a memory write protect error (TermSTS = 04H) will

occur.

0: Write enabled

1: Write protected

SW067

SW C

RW LW W XW/YW

Special registers

Counter registers

Timer registers

Input/output registers

Link registers

Link relay registers

Auxiliary registers

Data registers

PC internal file registers

Expansion file registers (IC card)

When PC link transmission or the UDP socket interface is used, if an application

transmits to a nonexistent remote port, an transmission error (TermSTS = 0BH, detailed

information = 0020H) occurs.

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5.4 PC Link Protocol Transmission (Data read)

The T series PC link protocol allows a T2N on the network to read register data from another T2N

or T3H port's registers into its own registers.

As is the case with the computer link protocol, the PC link protocol uses UDP/IP as its

transmission protocol.

The PC link main port uses a UDP socket for message transmission and transmits to the slave

Ethernet Port message transmission UDP socket. The user program that runs on the main port is

discussed later.

When this function is used on the PC link slave port, the T2N simply performs the:

Parameter setup and

Operating mode control (message transmission permission)

that were described in an earlier chapter. There is no need to create any special user programs on

the T2N.

Usage Recommendations

1. Since UDP/IP does not provide control functions to guarantee communication reliability, higher level

protocols (such as retry) are required.

2. No processing is performed if a PC link protocol transmission message is received at any point

other than a message transmission UDP socket.

a. Function

The register data specified by the remote port (T2N/T3H) is read to the specified register on the

local port (T2N).

b. Transfer parameters

3100H

CMD = 0021H

WordSize

SRID

Module designation

A+1

A+2

A+3

A+4

A+5

A+6

A+7

A+8

A+9

A+10

Command number

(1) Transfer register data length: 1 to 485 words

(2) Local port register type code

(3) Local port register number

(4) Remote port register type code

(5) Remote port register number

(6) Timer count

SRegNO

DRID

DRegNO

Timecnt

D-IPAddress

Remote port IP address (The input format is the same as that

for parameter setup requests.)

D-UDP PortNO

Remote port message transmission UDP port number

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(1) Transferred register data length

Specifies the transmission data length in word units. (1 to 485 words)

For the T/C registers, the data length will be between 1 and 323 words.

(2) Local port register type code

This code specifies the type of the local port register into which the data read out will be

stored. See table 5.1 for the codes that can be specified here.

(3) Local port register number

Specifies the starting number of the register specified by the local port register type code.

(4) Remote port register type code

This code specifies the type of the remote port register that holds the transmission source data.

See table 5.1 for the codes that can be specified.

(5) Remote port register number

Specifies the starting number of the register specified by the remote port register type code.

(6) Timer count

Specifies a time used to limit the response time from the remote port in 0.1 second units.

A+10

0: Use the user-specified value (0.1 to 3276.7 seconds)

1: Use the default value of 30 seconds.

c. Status (See figure 4.3 for details on bits C, D, E and F.)

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

d. Important items

The read operation is not synchronized with the remote port T2N/T3H scan operation.

If synchronization is necessary, applications must perform synchronization processing, such as

transferring the data to a separate registers at the start of the T2N scan.

The command number (0021H) is the same as the "Data Write".

A transfer word count error (TermSTS = 09H) occurs if the transferred register data length

exceeds the range 1 to 485 words (or 1 to 323 words for the T and C registers).

A register specification error (TermSTS = 01H) occurs if a value other than a stipulated value

is specified for the register type codes (SRID/DRID).

A register specification error (TermSTS = 01H) occurs if 0007H (the T register) is specified

for the local port register type code and a register other than the T register is specified for the

remote port register type code. This also holds for the C register.

A boundary error (TermSTS = 0AH) occurs if a range spanning both the base T registers (0 to

511) and the expansion T registers (512 to 999) is specified for the T register.

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For data storage registers, a boundary error occurs if the specified area (start register + register

range) does not exist in either the local or remote ports.

Local port: TermSTS = 0AH, remote port: TermSTS = 8AH

A response timeout error (TermSTS = 02H) occurs if the response time from the remote port

exceeds the time specified by the timer counter value.

Read protection can be specified for each register type on the local T2N by using the special

coil settings described below. In this case, a memory write protect error (TermSTS = 04H) will

occur.

0: Write enabled

1: Write protected

SW067

SW C

RW LW W XW/YW

Special registers

Counter registers

Timer registers

Input/output registers

Link registers

Link relay registers

Auxiliary registers

Data registers

PC internal file registers

Expansion file registers (IC card)

When PC link transmission or the UDP socket interface is used, if an application

transmits to a nonexistent remote port, an transmission error (TermSTS = 0BH, detailed

information = 0020H) occurs.

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5.5 Sample PC Link Protocol Transmission Program

This section presents a sample program that uses PC link protocol transmission.

This program creates increment data within the local port and writes it to the remote port's

registers. Next it reads out the same area and compares it with the data within the local port to

check that the function succeeded.

This program assumes that the parameter setup request and the operating mode control request

(message transmission permission) have already completed.

Local port IP address:

133. 113. 98. 10 (85H. 71H. 62H 0AH)

Local port message transmission UDP port number:

RW090: Execution count specification (1 to 32767)

2000

RW091: Operation when a comparison error occurs (continue: 0, stop: 1)

RW092: Transfer register data length (1 to 485 words)

RW093: Write time transfer source register type

RW094: Write time transfer source register start number

RW095: Write time transfer destination register type/read time readout source register type

RW096: Write time transfer destination register start number/read time readout source

RW097: Read time storage register type

RW098: Read time storage register start number

W0991, W0990:

Remote destination IP address

133. 113. 98. 20 (85H. 71H. 62H. 14H)

W0992: Remote destination message transmission UDP port number .......... 1025

This ladder program is executed by turn on the R0520 A contact.

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|R0520

R0090 |

1|-| |------------------------------------------------------------( )--|

|/* PC link preparation */

|R0520

2|-| |---|^|-+[ 01000 MOV RW090][ 00000 MOV RW091][ 00400 MOV RW092]---|

/* Number of executions, Operation on error

|occurrence, Transfer data length */

+[ 00004 MOV RW093][ 01000 MOV RW094]---------------------|

/* Transmission source register type, start number */

+[ 00004 MOV RW095][ 02000 MOV RW096]---------------------|

/* Transfer destination register type, start number */

+[ 00004 MOV RW097][ 03000 MOV RW098]---------------------|

/* Storage register type, start number */

+[ 0341995909 DMOV W0991· W0990][ 01025 MOV W0992]---------|

/* Remote destination IP address, message transmission

|UDP port number */

|/* Data preparation */

|R0090 R009F

3|-| |-+-|/|-+-|^|-+[00001 MOV W0901][00900 MOV W0902][00000 MOV W0918]|

|R0091|

|-| |-+

+[W0946 MOV W0900][RW093 MOV W0916][RW094 MOV W0917]|

|R0098

R0098 |

+-|/|--[W0901 XFER W0901 -> W0916]-----+[ +1 W0917]--( )--|

+[ +1 W0918]------|

+[ +1 W0900]------|

+[RW092 = W0918][ SET R0092][ RST R0091][ RST R0520]------|

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|/* Register write */

|R0092

4|-| |-+[12544 MOV W0903][00033 MOV W0904]----------------------------|

| /* Designates the module and sets the CMD number. */

+[RW092 MOV W0905]--------------------------------------------|

| /* Sets the transfer register data length.

+[RW093 MOV W0906][RW094 MOV W0907]----------------------------|

| /* Sets the transmission source register type, start number. */

+[RW095 MOV W0908][RW096 MOV W0909]----------------------------|

| /* Sets the transfer destination register type, start number. */

+[00100 MOV W0910]---------------------------------------------|

| /* Sets the response time limit (10 seconds). */

+[W0991· W0990 DMOV W0912· W0911][W0992 MOV W0913]----------------|

| /* Remote destination IP address, message transmission UDP port

|number */

+[W0903 SEND W0914][SET R0093][RST R0092]----------------------|

/* Sets the request, and starts post-completion readout. */

|/* Register readout */

|R0093

5|-| |-+[12544 MOV W0920][00033 MOV W0921]----------------------------|

| /* Designates the module and sets the CMD number.

+[RW092 MOV W0922]---------------------------------------------|

| /* Sets the transfer register data length.

+[RW097 MOV W0923][RW098 MOV W0924]----------------------------|

| /* Sets the storage register type, start number. */

+[RW095 MOV W0925][RW096 MOV W0926]----------------------------|

| /* Sets the transfer destination register type, start number. */

+[00100 MOV W0927]---------------------------------------------|

| /* Sets the response time limit (10 seconds).

+[W0991· W0990 DMOV W0929· W0928][W0992 MOV W0930]----------------|

| /* Remote destination IP address, message transmission UDP port

|number */

+[W0920 RECV W0931][SET R0094][RST R0093]----------------------|

/* Sets the request, and starts post-completion comparison. */

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|/* Comparison check */

|R0094

6|-| |-+[00001 MOV W0940]------+[00001 MOV W0941][00980 MOV W0942]-------|

+[00001 MOV W0943][00981 MOV W0944]-------|

+-|^|--[RW094· RW093 DMOV W0948· W0947][RW098· RW097 DMOV W0950· W0949]|

|R0095

+-|/|---|^|-+[W0947 XFER W0940 -> W0941]--------------------------|

R0096 |

+[W0949 XFER W0940 -> W0943]---------------------( )--|

|R0096

+-| |-+[W0980 = W0981][ +1 RW190]---------------------------------|

R0910

+[W0980 <> W0981][ +1 RW191]--| |---[ SET R0099][ RST R0094]|

R0095 |

+-|^|--[ +1 W0945][ +1 W0948][ +1 W0950]---------------( )--|

R0097 |

+[RW092 = W0945][ 00000 MOV W0945][ +1 W0946]----------( )--|

|R0097 R0099

+-| |---|/|-+[RW090 > W0946][SET R0091]-----------+[ RST R0094]---|

+[RW090 = W0946][00000 MOV W0946]-----+

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6. Socket Interface Communication

CAUTION

1. Chapter 6 presents information related to using the functions provided by the Ethernet Port from a

T2N, including the instruction (request) format, important items that require attention, and sample

programs. That chapter also presents items considered necessary when using the Ethernet Port.

Make a point of understanding the content of chapter 4 thoroughly before writing programs that use

the Ethernet Port. The sample programs present basic examples of Ethernet Port usage, and should

be reviewed carefully before use in an actual system.

This chapter describes the functions and positioning of the socket interface, and the differences

between the UDP socket interface and the TCP socket interface. Next, this chapter presents notes

on using the Ethernet Port socket interface and describes the procedures for using this

functionality.

6.1 Overview

This section describes the functions and positioning of the socket interface, and the differences

between the UDP socket interface and the TCP socket interface.

1. Positioning and functionality

The socket interface is a programming interface that allows user programs to use the TCP/IP and

UDP/IP functions. Socket interface communication is a communication technique that has become

standard on engineering workstations (EWS) and other networked computer systems.

The socket interface can be used for communication between host application programs and user

programs running on the T2N.

The Ethernet Port socket interface provides eight sockets, and the communication protocol (TCP/IP

or UDP/IP) used with the remote destination can be specified for each socket. User programs on

the T2N use the SEND and RECV instructions to use the socket interface.

TCP/IP (Transmission Control Protocol/Internet Protocol)

UDP/IP (User Datagram Protocol/Internet Protocol)

Figure 6.1 shows the positioning of the socket interface.

EWS

T2N

Application program

T2N user program

System

calls

SEND and RECV

instructions

OS (UNIX)

T2N firmware

Socket interface

UDP/TCP

Socket interface

UDP/TCP

CSMA/CD

Data

communication

TCP or UDP

Figure 6.1 Positioning of the Socket Interface

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2. Differences between the UDP socket interface and the TCP socket interface

a. UDP socket interface (See figure 6.2.)

Provides an in/out port (socket) for data communication between a transmission source port

and a transmission destination port.

Data for the transmission source and transmission destination (IP addresses and port numbers)

is specified in the send/receive data.

Since the transmission source and transmission destination are specified in each data item, a

UDP socket can communicate with multiple remote UDP sockets.

The UDP socket interface provides no control functionality such as reception verification using,

e.g. ACK (acknowledge) responses, or retransmission processing to assure transmission

reliability. Therefore, reliability must be assured by higher level protocols implemented by user

programs.

Transmission source port

UDP socket

Transmission destination port

UDP socket

Transmission data

Reception verification (only if

implemented by user programs)

Figure 6.2 UDP Sockets

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b. TCP socket interface (See figures 6.3 and 6.4.)

In TCP communication, a pipe-like virtual communications line (connection) is established

between sockets on two ports that are communicating (sending and receiving), and since the

protocol handles control of reception verification and retransmission processing, it provides a

highly reliable communication.

There are two methods for establishing a connection: passive open and active open. In passive

open, the local socket is put into a state in which it is waiting for a request to establish a

connection from another port. In active open, a request is issued for the establishment of a

connection with a socket in the passive open state.

When establishing a connection between two ports, one port must first open a socket in passive

open mode, and the other port must perform an active open on a local socket with respect to a

remote socket that is in the passive open state.

Since the passive open socket port "provides" data transmission and other services, it is called

the "server."

Since the active open socket port "requests" services, it is called the "client."

A socket for which a connection has been established is unable to transfer data with any other

sockets unless that connection is first released.

Since sockets are connected by connections, there is no need to specify the transmission source

or transmission destination with every data item transmitted.

Transmission source port

TCP socket

Transmission destination port

TCP socket

Connection

Transmission data

Client side

Active open

Server side

Passive open

Reception verification

Figure 6.3 TCP Socket (Connection)

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Client side

Server side

(Active open)

(Passive open)

Closed state

Passive open

Connection establishment request

Active open

Connection established

Data transmission

Acknowledge response (ACK)

Next data transmission

Data transmission

Data reception

Next data transmission

Data transmission

Acknowledge response (ACK)

Data transmission

Data reception

Next data transmission

Acknowledge response (ACK)

Data transmission

Close request

Closed state

Close request

Closed state

Figure 6.4 TCP Connection Communication Procedure (Overview)

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6.2 Ethernet Port Socket Interface Usage Notes

This section presents points that require attention when using the socket interface on the Ethernet

Port for data transmission.

1. Data handling and data segmentation in UDP socket interface transmission and reception

a. In UDP socket interface transmission, data sent in a single transmission is handled by the

receiving Ethernet Port as a single data unit, and that data is transmitted to the T2N in a batch

operation by a receive request.

b. The size of data units that can be handled by the Ethernet Port socket interface in a single

operation is limited to a maximum of 2000 bytes. If the sending port sends a data unit larger

than 2000 bytes, the Ethernet Port UDP socket interface will not be able to receive that data.

Users should determine the maximum size of the data units to be sent or received at the

system design stage.

c. Transmitted data that exceeds 1472 bytes is divided (fragmented) into units of 1472 bytes.

This is the limit of the length of packets (data units flowing on the network) transmitted over

the network (10BASE-T). (See figure 6.8.)

For example, when transmitting a 2000 byte data set, which is the largest data size that can be

handled by the Ethernet Port, the phenomenon shown in figure 6.5 can occur.

(1) The sending T2N user program requests a transmission of 2000 bytes.

(2) The transmitted data is divided into two fragments, A (with 1472 bytes) and B (with 528

bytes) by the send side Ethernet Port.

(3) A and B are put onto the network in order.

(4) The receive side Ethernet Port connects the received data A and B, recovering the

original data.

(5) The data is accepted by a receive request from the receive side T2N for 2000 bytes of

data and the data is stored in the specified register. (See section 6.4 (3).)

d. In the UDP socket interface, after the transmitted data is reassembled to the original data it is

passed to the user program and stored in the specified register.

(The fragments A and B are reassembled to the original data by UDP/IP processing.)

Send side T2N

Ethernet Port

Network

Ethernet Port

Receive side T2N

¬ Send request

•

2000 bytes

1472 bytes

° Receive request

2000 bytes

528 bytes

Receive response

Figure 6.5 Transmission Data Fragmentation in the UDP Socket Interface

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e. The T2N receives the data which specifies the size of reception data in the transfer parameter

from the Ethernet Port.

f. Allocate an area one word larger than the transmitted data size as the T2N register

area that will hold the received data. As the result of a receive request, information

indicating the size of the transmitted data for the single operation plus the data transmitted in

the single operation will be stored in that area.

g. In receive request programs from the T2N, set the size of reception data to a value

equal to or larger than that of the maximum size for the transmission data in a single

operation. If the size of reception data is smaller than the transmitted size of transfer data to

socket, the data that exceed the specified size of reception data is canceled.

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2. Data handling and data segmentation in TCP socket interface transmission and reception

a. When using the TCP socket interface for data transmission, the data transmitted in a single

operation is handled by the receive side Ethernet Port as one section of a continuous data

stream that comes from the sender. (See figure 6.6.)

In this technique, the data is not handled as a single unit, as it is in UDP socket interface

transmission.

b. The amount of data transmitted to the T2N from the TCP socket interface due to a T2N

receive request will vary depending on both the timing with which the T2N issues the receive

request, and the timing with which the data arrives at the TCP socket interface.

c. In the Ethernet Port TCP socket interface, up to 4380 bytes of received data can be stored per

socket. Also note that up to 2000 bytes of data can be transferred to the T2N for a single

receive request from the T2N. For example, if the remote port sends 800 bytes at a time, then

the amount of received data per socket may be either 800, 1600, 2400, 3200, or 4000 bytes. If

the amount of received data is 800 or 1600 bytes, those 800 or 1600 bytes can be acquired by

the T2N by a receive request from the T2N. In cases where the amount of received data is

2400, 3200, or 4000 bytes, 2000 bytes will be transferred by the first receive request from the

T2N, and the remaining 400, 1200, or 2000 bytes can be transferred by issuing another

receive request from the T2N.

d. Therefore, to handle one unit of transmitted data as a single unit of data on the receiving side

as well, at the system design stage users must analyze both the data format (head/tail

delimiting codes, data sequencing) and the amount of data to be transmitted, and provide

routines to decode the transmitted data in the receiving T2N user software.

e. Allocate an area one word larger than the transmitted data size as the T2N register

area that will hold the received data. As the result of a receive request, information

indicating the size of the transmitted data for the single operation plus the data transmitted in

the single operation will be stored in that area.

Ethernet Port TCP socket interface

Consecutive data (up to 4380 bytes)

T2N

Receive request

Data received up to this

time

Max: 2000 bytes

Data received by

the T2N

Transmitted data

Receive response

Transferred data

Figure 6.6 Handling of Transmitted Data in the TCP Socket Interface

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f. When the TCP socket interface is used, transmitted data is divided (fragmented) into units of a

size determined when the connection between the two sockets was established. The upper

limit of the fragment size is 1460 bytes. This is the limit of the length of packets (data units

flowing on the network) transmitted over the network. (See figure 6.8.)

For example, when transmitting a 2000 byte data set, which is the largest data size that can be

handled by the Ethernet Port, the phenomenon shown in figure 6.7 can occur. The largest

segment size that can be received in this case is 1460 bytes.

•

The sending T2N user program requests a transmission of 2000 bytes.

The transmitted data is divided into two units called segments, A (with 1460 bytes) and

B (with 540 bytes) by the send side Ethernet Port.

A and B are put onto the network in order.

The data that arrived at the receive side Ethernet Port is acquired by a receive request for

2000 bytes from the T2N, and stored in the user specified register area. (See section 6.3

(7).)

The amount of data that can be acquired by a TCP receive request differs depending on

the timing with which the T2N issues the receive request and the timing with which the

data arrives at the Ethernet Port.

If data has not yet arrived at the receive side Ethernet Port when the receive request is

issued:

When segment A arrives at the Ethernet Port, only segment A will be passed to

the requester.

If only segment A has arrived at the receive side Ethernet Port when the receive

request is issued:

Only segment A will be passed to the requester.

If segments A and B have arrived at the receive side Ethernet Port when the receive

request is issued:

A data item consisting of A and B will be passed to the requester.

If B was not received, another receive request can be issued from the T2N to acquire B.

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Ethernet Port

Send side T2N

Ethernet Port

Send side T2N

Network

¯First receive

request

2000 bytes

ÀSend request

2000 bytes

1460 bytes

°Second receive

request

540 bytes

2000 bytes

540 bytes

Figure 6.7 Transmission Data Fragmentation in the TCP Socket Interface

g. When the transmission data is fragmented as discussed above, the amount of data transferred

to the T2N in a TCP socket interface receive request differs depending both on the timing with

which the T2N issues the receive request and the timing with which the data arrives at the

Ethernet Port.

h. To handle single units of transmission data on the receiving side as single units as well, the

user software on the receiving side must recognize the end of the transferred data (either by

using counts in the transmitted data or by including an end marker in the transmitted data) and

iterate receive requests until all the transmitted data has been received.

i. User programs must store all incoming data so that the register area used to transfer

data to the T2N is not overwritten when using iterated receive requests.

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Preamble (7 bytes)

Signal used to synchronize reception

SFD (Start Frame Delimiter) (1 byte)

Remote port address (6 bytes)

Local port address (6 bytes)

Ethernet type (2 bytes)

0800H:IP, 0806H:ARP

IP header (20 bytes)

Packets

UDP header

(8 bytes)

TCP header

(20 bytes)

traveling on the

transmission

path

(72 to 1526

bytes)

UDP data field

(up to 1472 bytes)

IP datagram

(46 to 1500

bytes)

Data fields in

the packets

traveling on the

transmission

path

TCP data field

(up to 1460 bytes)

IP data field

(up to 1480

bytes)

FCS (Frame Check Sequence) (4 bytes)

32-bit CRC code for the sections of the packet

other than the preamble, the SFD, and the FCS.

(Packet error detection)

Figure 6.8 Packet Format/IP Datagram

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3. Socket interface port numbers

a. Set the port numbers for local TCP and UDP sockets to values in the range 1024 to

65535. The Ethernet Port will issue an error if any other values are used. This is because the

port numbers from 1 to 1023 are allocated for UNIX workstation standard services.

b. There are cases where there are reserved ports with numbers outside the 1 to 1023 range on

specific workstations. Verify this on the workstations actually being used, and be sure that

these reserved port numbers are not duplicated on the Ethernet Port.

c. The same port number cannot be assigned to multiple sockets for TCP and UDP sockets. Be

especially careful not to duplicate UDP port numbers used for message transmission

(computer link protocol and PC link protocol transmission).

d. When TCP sockets and UDP sockets are used together in the same Ethernet Port, the same

port number cannot be used for both TCP and UDP sockets.

4. Notes that apply to both the UDP and the TCP socket interface

a. Careful attention to changes in bits in the socket status is required when using socket

interface send/receive requests.

b. When using multiple Ethernet Port functions at the same time, communication processing may

become slower, depending on the details of the user programs executing.

c. Communication efficiency may degrade if the network to which the Ethernet Port is connected

is heavily loaded.

d. Since processing a close request requires processing the send and receive requests issued to

that socket before the close request was issued, a significant amount of time may be required

to process some close requests.

e. The Ethernet Port includes a common transfer/reception buffer (of about 60k bytes) to hold

data. This common transfer/reception buffer is shared by all open sockets. In the Ethernet Port

TCP socket interface, up to 4380 bytes of received data can be stored per socket. In the case

of using all TCP sockets, this buffer of about 60k bytes do not become full. In the case of

UDP socket, the amount of reception data is no limit. So, if the T2N does not receive the

reception data in the socket, the common transfer/reception buffer may become full. In this

case, new incoming data will be discarded and the T2N can not transmit data, either (the send

request is insufficient resources error). To avoid this state, user programs should either

continuously issue receive requests and readout any data in the reception buffer, or else

monitor the socket status (See section 6.3) for the presence of reception data and perform

reception processing as required. If the insufficient resources error to not receive data occurs,

it is possible to cancel that the socket, the reception data becomes full, is closed.

f. Since Ethernet Port receive requests (both TCP and UDP) put the object socket in a wait state

waiting for data from the remote port, transmission over that socket is not possible.

If full-duplex communication with the remote port is required, set up two sockets, one for

transmission and one for reception.

g. There are a total of eight requests used for socket interface transmission. Of those, the T2N

waits internally for completion for the timeout time for five requests, namely,

UDP open, send, and close requests

TCP send and close requests

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If the timeout time expires, the "transmission complete timeout (no instruction response)"

error is issued. Since this error has the same code as module failure errors, first check whether

or not the Ethernet Port has failed before attempting to recover from the error.

h. User programs specify the time limit until completion for the following three requests used in

socket interface transmission:

UDP receive request

TCP open request

TCP receive request

If this time limit is exceeded, a "timeout" error is issued. In particular, the Ethernet Port

reports the timeout error to the T2N.

i. The Ethernet Port uses a priority ordering in processing sockets 1 through 8. Therefore,

systems constructed so that socket 1 is activated frequently may not be able to process socket

8, resulting in "Transmission completion timeout" errors occurring. When constructing a

system, take the socket utilization conditions into account when allocating sockets.

Since the send/receive processing for each socket requires about 50 ms, applications that issue

send or receive requests to a given socket should leave an interval of at least 50 ms times the

number of sockets used between each request.

(Interval between requests to the same socket) ³ (Number of sockets used ´ 50 ms)

Similarly, the above intervals averaging 50 ms should be left between transmissions from

remote ports to the local port.

(Interval between remote port transmissions) ³ (Number of remote ports ´ 50 ms)

5. UDP socket interface notes

a. In transmission using UDP sockets, the user program must implement any processing required

to assure transmission reliability, such as verifying the reception of transmitted data and

retransmission.

b. It is possible to broadcast to all ports on the network using UDP sockets.

Send side:

Set the transmission destination address to "255.255.255.255". This is

"FF.FF.FF.FF" in hexadecimal. The "0.0.0.0" used by some UNIX

versions (in particular, 4.2 BSD) cannot be used.

Set the UDP port number for the socket to which you want to issue a

broadcast as the transmission destination object socket UDP port

number. It is convenient to prepare a dedicated socket in advance if

broadcast transmission is to be used.

Receive side: Specify "0.0.0.0" as the transmission source IP address.

Specify the UDP port number for the broadcast transmitting socket as the

transmission source UDP port number.

c. Data transmission between sockets on the same port is not supported by UDP.

d. When PC link transmission or the UDP socket interface is used, if an application

transmits to a nonexistent remote port, an transmission error (TermSTS = 0BH, detailed

information = 0020H) occurs.

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6. TCP socket interface notes

a. When a passive open is executed, the specified socket is put in the active open wait state. If

the remote IP address (DIPAddress) and the remote port object socket TCP port number

(DTCP_PORTNO) values are set to 0, the socket will be able to handle active opens from any

remote port.

b. A connection is established by an active open from another socket applied to a socket in the

passive open state. A connection cannot be established by a passive open from another socket

applied to a socket in the passive open state. Similarly, a connection cannot be established by

an active open from another socket applied to a socket in the active open state. That is, the

roles of two sockets for which a connection is to be established must be determined in

advance.

c. For a socket in the passive open state, it is not possible to open multiple connections from

other ports by issuing multiple active opens.

d. Connections cannot be established between sockets on the same port.

e. If transmission is impossible due to network congestion or other reason when a send request is

executed, the send request is stored internally in the Ethernet Port so that it can be sent later.

The number of items that can be stored is three per socket. If the Ethernet Port cannot store

the request, is returns an error.

f. If a close request is issued first for a connection that is being established, then it will be

possible to execute the next open request for the object sockets at the point when the close

request processing completes normally. On engineering workstation and personal computer

systems, TCP sockets on the port that performed the close processing for the open connection

cannot be opened again for a fixed period, usually about 1 to 2 minutes, although this time

varies between systems.

g. When the Ethernet Port issues a close request first, the Ethernet Port waits 10 seconds. If the

T2N using the same port number reopen request during waiting for 10 seconds, the T2N

becomes “LAN controller driver error”.

h. If a close request comes from the remote port TCP socket while a connection is established,

the local port must also close the socket. As a technique for checking for the reception of close

requests from the remote TCP socket, user programs should monitor the RCLOSE and CONN

bits in the socket status. (See section 6.3.) RCLOSE is set to 1 and CONN is set to 0 when a

close request is received from the remote TCP socket. The Ethernet Port will return an error if

send or receive requests are issued in this state. A receive request in the receive wait state also

returns an error.

i. The Ethernet Port in the current state does not support a keep alive function for TCP

connections. Verification from the Ethernet Port side to other ports is not performed.

However, the Ethernet Port does respond to verifications from other ports. (Responding to

verifications from other ports is performed independently of user programs.)

Therefore, the disappearance of remote ports cannot be detected at the TCP level. We

recommend using the detection techniques described in items j and k below to detect this

condition.

Keep alive function: A function that checks, at the TCP protocol level, whether or not the

connection is operating normally if there has been no activity over the

connection for a certain fixed period.

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j. For a TCP receive request, the Ethernet Port simply waits for data from the remote port. In

situations where data is sent periodically from the remote port, reception wait timeouts, i.e. no

response from the remote port states, can be detected by setting a reception wait time limit.

The following techniques, among others, can be used to detect no response states when data is

sent with no fixed period.

Periodic execution of existence verification requests (See section 7.3.)

The techniques described in the next section, which use a separate TCP connection

One of the following problems may have occurred when there is no response from the remote

port:

The remote port may have gone down.

Power may have been lost.

The remote ports and/or local port may have become disconnected from the network.

k. With a connection established, if the no response state from the remote port continues when

data is sent and the Ethernet Port internal resend processing times out (the timeout time is

about 1 minute), the NOACK bit in the socket status (See section 6.3.) will be set to 1. User

programs should close such sockets.

Also note that the Ethernet Port will return an error if send or receive requests are issued in

this state.

User program send requests are seen as completing as soon as they are received by the

Ethernet Port. This means that even if the remote port goes to the no response state, a

number of send requests equal to the Ethernet Port internal storage capacity (i.e., three

requests) will complete normally. When the number of send requests exceeds the Ethernet

Port internal storage capacity, errors will be returned for all further send requests.

l. Segments with the reset bit (RST) set to 1 (reset segments) are not supported by the Ethernet

Port. If a reset segment is received from the remote port, the NOACK bit in the socket status

(see section 6.3) will be set to 1 about 32 seconds later. Such sockets should be closed.

Reset segment: A transmitted segment used to forcibly close a connection from one of the

ports. Connections are forcibly closed in this manner if an error that cannot

be recovered from by normal means such as retransmission has occurred, or

if a port has recovered after having gone down.

m. In the Ethernet Port TCP socket interface, when reception data in the Ethernet Port is

read out by a receive request from the T2N, the Ethernet Port sends an ACK

(acknowledge response) to the port that sent the data. Since an ACK will not be sent to

the sending port if the received data remains in the Ethernet Port if the T2N does not read out

that received data, the sending port will resend the data. If this state continues for a

predetermined period, the sending port may will decide that the TCP connection is abnormal

and close the connection. To prevent this from occurring, the T2N software should monitor the

RCV (receive data present) bit and issue receive requests when necessary.

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6.3 Socket Interface Information

The information for the eight socket interface sockets held by the Ethernet Port can be read out

with the T2N READ instruction. The Ethernet Port holds five words of socket status information

for each socket. User programs should access this information as necessary when using socket

interface transmission.

Remote port TCP/UDP port number

Remote port IP address

TCP/UDP port number for this socket

Socket status

Table 6.1 lists the structure of the socket interface information and the extended memory area

addresses.

Table 6.1 Socket Interface Information

Socket identifier

Remote port number (TCP only)

Remote port IP address (TCP only)

0F4BH 0F53H 0F5BH 0F63H 0F6BH 0F73H 0F7BH 0F83H

0F4CH 0F54H 0F5CH 0F64H 0F6CH 0F74H 0F7CH 0F84H

0F4DH 0F55H 0F5DH 0F65H 0F6DH 0F75H 0F7DH 0F85H

Local port TCP/UDP port number

Socket status

0F4EH 0F56H 0F5EH 0F66H 0F6EH 0F76H 0F7EH 0F86H

0F4FH 0F57H 0F5FH 0F67H 0F6FH 0F77H 0F7FH 0F87H

For UDP sockets, the remote port number and IP address data are invalid.

The socket status has the following structure.

TCP

AOPEN CONN RCLOSE

NOACK

UDP

POPEN

RCV

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Bit

no.

Bit

Condition under which the bit is set to 1

Condition under which the bit is reset to 0

TCP

TCP used by the socket

The socket closed in response to a close request

UDP

UDP used by the socket

TCP socket in active open state

AOPEN

POPEN

TCP socket in passive open state or UDP

socket in open state

CONN

TCP connection established

Disconnected by the local port with a close request

Disconnected by the remote port

RCV

Received text present

No received text

RCLOSE An established TCP connection disconnected The socket closed in response to a close request

by the remote port

NOACK

No response received from the remote port for The socket closed in response to a close request

a local port send operation in a state where a

TCP connection was established, and the TCP

resend function resulted in a timeout (because

the remote port was down, etc.).

If the wait time exceeds the set value during a When a TCP active open request is reissued.

TCP active open request.

This bit is not set to 1 for a TCP passive open

request timeout.

A socket status in which neither AOPEN nor POPEN is set to 1 indicates that the socket is in the

closed state.

Important items

This area is a read-only area. Do not attempt to write this data with the WRITE instruction. It will

no longer be possible to acquire correct data after such an operation.

Sample: Socket interface information readout program

|R0000

1|-| |-[03907 MOV RW010][00005 MOV RW011][H00FE READ RW010 -> D1000]--|

READ instruction description

H00FE: Module designation. The Ethernet Port must specify H00FE.

RW010: Specifies the start address of the socket status information.

If 03907 (0F4BH) is specified, the socket status information for

socket 1 will be read out.

RW011: Specifies the number of words (00005) to be read out.

D1000: Specifiesthestartingaddressoftheareatoholdthereadoutsocket

status information.

In this case, the read out downloaded information is stored at locations

D1000 to D1004.

Setting R0000 to 1 will store the socket status information for socket

1 at locations D1000 to D1004.

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6.4 Using the Ethernet Port Socket Interface

This section describes the requests used by T2N user programs to use UDP and TCP sockets.

There are eight types of request as listed below.

UDP socket (open request, send request, receive request, close request)

TCP socket (open request, send request, receive request, close request)

1. UDP open request (using the SEND instruction)

a. Function

This request opens any of the eight sockets.

Transmission protocol: UDP/IP

b. Transfer parameters

3100H

Module designation

Command number

A+1

A+2

A+3

CMD = 0031H

SportNO

Socket identifier (1 to 8)

Local port specified socket UDP port number

(1024 to 65535)

UDP_PORTNO

c. Status (See figure 4.3 for details on bits C, D, E and F.)

SportNO

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

SportNO: Socket identifier (1 to 8)

TermSTS:See tables 4.3 and 4.4.

Detail information: See table 4.5.

d. Important items

After this request completes normally, UDP send, receive or close requests can be sent to the

socket.

An error is returned if an open request is issued for an already open socket.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Already open (0080H)

An error is returned if a value other than 1 to 8 is specified as the socket identifier.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Illegal socket identifier (0082H)

An error is returned if a value other than a local port specified socket UDP port number is

specified.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Port number error (0071H)

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Not only must the specified socket UDP port number on the local port not overlap with UDP

port numbers used for message transmission and previously used UDP port numbers, but it also

must not overlap with any TCP port number. An error will occur if the port number overlaps.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Already open (0080H)

If the T2N internal completion wait time limit (2 seconds) is exceeded for this request, the error

listed below is returned.

Status: Send completion timeout (TermSTS = 06H)

In this case, first verify that the Ethernet Port is not in the down state by checking the station

status, and then verify the open/closed state of the socket in the socket status.

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e. UDP open processing example

Ladder program flowchart

Error result

UDP open processing start

Socket status read/verify

Are bits C and D both 0?

(Closed state?)

The specified socket is already open.

Yes

Execute a UDP open request

(CMD = 0031H).

Hold the input of function block in the

on state until the SEND instruction

completes.

Instruction

completion

Verify the status

An error occurred in the open processing

and the specified socket could not be

opened.

Handle the error according to the

completion and socket status.

Normal complete?

Yes

Terminate UDP open processing

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2. UDP send request/broadcast send request (using the SEND instruction)

a. Function

This request sends local port register data using an open UDP socket.

Amount of data sent: 1 to 1000 words

b. Transfer parameters

3100H

CMD = 0032H

SportNO

Module designation, 1: channel number

Command number

Socket identifier (1 to 8)

A+1

A+2

A+3

A+4

DIPAddress

Transmission destination IP address

(The input format is the same as that for the parameter

setup request.)

A+5

A+6

A+7

A+8

D_UDP_PORTNO

WordSize

Transmission destination object socket UDP port number

Transmission data length: 1 to 1000 words

Transmission data storage register type code

Transmission data storage register number

SRID

StreqNOD

Transmission data storage register type code: Type code for the register that holds the

transmission data. (See Figure 5.1)

Transmission data storage register number:

Starting number of the registers that hold the

transmission data.

c. Status (See figure 4.3 for details on bits C, D, E and F.)

SportNO

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

SportNO: Socket identifier (1 to 8)

TermSTS:See tables 4.3 and 4.4.

Detail information: See table 4.5.

d. Important items

The T/C register flag data is not transmitted if the T/C registers are not specified as storage

registers for transmitted data.

An error is returned if a send request is issued for a socket that is not yet opened.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Unopened (0081H)

An error is returned if a value other than 1 to 8 is specified as the socket identifier.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Illegal socket identifier (0082H)

If the IP address of the local port is specified as the transmission destination IP address, it will

be possible to send data, but it will not be possible to receive that data with a receive request.

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Values in the range 1024 to 65535 can be specified as the object socket UDP port number for

the transmission destination. An error will be returned if a value outside that range is specified.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Port number error (0071H)

An error will be returned if a value of 0 words or 1001 or more words is specified as the

transmission data size.

Status: Transmission word count error (TermSTS = 09H)

The T2N performs an area check for the register area based on the transmission data storage

Status: Boundary error (TermSTS = 0AH)

If the T2N internal completion wait time limit (2 seconds) is exceeded for this request, the error

listed below is returned.

Status: Send completion timeout (TermSTS = 06H)

In this case, first verify that the Ethernet Port is not in the down state by checking the station

status, and then perform the required error handling (the send request etc.).

The Ethernet Port uses a priority ordering in processing sockets 1 through 8. Therefore,

systems constructed so that socket 1 is activated frequently may not be able to process socket 8,

resulting in the following error response:

Status: Send completion timeout (TermSTS = 06H)

When constructing a system, take the socket utilization conditions into account when allocating

sockets. Since the send/receive processing for each socket requires about 50 ms, applications

that issue send or receive requests to a given socket should leave an interval of at least 50 ms

times the number of sockets used between each request.

(Interval between requests to the same socket) ³ (Number of sockets used ´ 50 ms)

Similarly, the above intervals averaging 50 ms should be left between transmissions from

remote ports to the local port.

(Interval between remote port transmissions) ³ (Number of remote ports ´ 50 ms)

When PC link transmission or the UDP socket interface is used, if an application

transmits to a nonexistent remote port, an transmission error (TermSTS = 0BH, detailed

information = 0020H) occurs.

e. Broadcast transmission

It is possible to broadcast to all ports on the network using UDP sockets.

Send side: Set the transmission destination address to "255.255.255.255", ("FF.FF.FF.FF"

in hexadecimal).

The "0.0.0.0" used by some UNIX versions (in particular, 4.2 BSD) cannot be

used.

Specify the UDP port number for the socket to which you want to issue a

broadcast as the transmission destination object socket UDP port number.

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UDP transmission processing example

Ladder program flowchart

Error result

UDP transmission processing start

Socket status read/verify

The processing in this section can be

performed at this stage or at the point the

instruction terminates abnormally.

Are bits C and E both 1?

(Opened state?)

The specified UDP socket is in the closed

state. (Open processing is required.)

Yes

Execute a UDP send request

(CMD = 0032H).

Hold the input of function block in the

on state until the SEND instruction

completes.

Instruction

completion

Verify the status

An error occurred in transmission

processing.

Transmission from the specified socket is

not possible.

Handle the error according to the

completion and socket status.

Normal complete?

Yes

Terminate UDP transmission

processing

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3. UDP receive request/broadcast receive request (using the RECV instruction)

a. Function

If an opened UDP socket receives data, read the received data into registers on the local port.

If no data has been received, wait until data arrives (the wait time can be set) and then, after

reception, read the received data into the local port registers.

Reception data size: 1 to 1000 words.

b. Transfer parameters

3100H

CMD = 0033H

SportNO

Module designation

Command number

Socket identifier (1 to 8)

A+1

A+2

A+3

A+4

DIPAddress

Transmission destination IP address

(The input format is the same as that for the parameter

setup request.)

A+5

A+6

A+7

A+8

A+9

D_UDP_PORTNO

WordSize

DRID

Transmission source object socket UDP port number

Reception data length: 1 to 1000 words

Reception data storage register type code

Reception data storage register number

Reception wait timeout time

DregNO

TimeCNT

Reception data length:

Set this parameter to a value greater than or equal to

the largest size for transmission data that could be sent

to the object socket in a single operation.

Reception data storage register type code: Type code for the register that stores the received data.

(See Figure 5.1)

Reception data storage register number:

Starting number of the registers that store the received

data.

Reception wait timeout time:

Specified in 0.1 second units. (1 to 65535)

If zero is specified, the system is set to an unlimited

(infinite) wait state.

c. Status (See figure 4.3 for details on bits C, D, E and F.)

SportNO

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

SportNO: Socket identifier (1 to 8)

TermSTS:See tables 4.3 and 4.4.

Detail information: See table 4.5.

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d. Methods for storing reception data

· Allocate a reception data storage register area with a size equal to the size of the reception data

plus one word. The reception data count (the size of the transmission data for a single

operation) and the transmission data for a single operation will be stored in this area as shown

in the figure.

Reception data count (bytes)

¬ Start of the specified

Reception data storage

Reception data

The T2N checks for register area allocation of the reception data size plus one word and

returns an error if the register area does not exist.

Status: Boundary error (TermSTS = 0AH)

In this case, data is not transferred to the register area, and the data is discarded. The data is

not retained in the Ethernet Port either.

e. Important items

An error is returned if a receive request is issued for a socket that is not yet opened.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Unopened (0081H)

An error is returned if a value other than 1 to 8 is specified as the socket identifier.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Illegal socket identifier (0082H)

It is not possible to receive data sent from the local port, even if the local port IP address is

specified at the transmission source IP address.

Values in the range 1024 to 65535 can be specified as the object socket UDP port number for

the transmission source. An error will be returned if a value outside that range is specified.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Port number error (0071H)

An error will be returned if a value of 0 words or 1001 or more words is specified as the

reception data size.

Status: Transmission word count error (TermSTS = 09H)

An error will be returned if the reception timeout time is exceeded.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Timeout(0020H)

Allocate a reception data storage register area with a size equal to the size of the

transmission data plus one word. The size of the transmission data for the single operation

and the size of reception data will be stored in this area.

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If the transmission data size for a single operation is larger than the reception data size, the

section of the transmitted data that exceeds the specified reception size is discarded, resulting

in the following error response.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Insufficient data size(00C1H)

If this error is occurred, a reception data storage register of the T2N enters the data following

below. The data of slash bar is not received to T2N and discarded.

The number of transferred bytes

from Ethernet Port to T2N

The size of

reception data

The size of reception

data of Ethernet Port

(Specify the T2N)

The reception data itself

The Ethernet Port uses a priority ordering in processing sockets 1 through 8. Therefore,

systems constructed so that socket 1 is activated frequently may not be able to process socket 8,

resulting in the following error response:

Status: Send completion timeout (TermSTS = 06H)

When constructing a system, take the socket utilization conditions into account when allocating

sockets. Since the send/receive processing for each socket requires about 50 ms, applications

that issue send or receive requests to a given socket should leave an interval of at least 50 ms

times the number of sockets used between each request.

(Interval between requests to the same socket) ³ (Number of sockets used ´ 50 ms)

Similarly, the above intervals averaging 50 ms should be left between transmissions from

remote ports to the local port.

(Interval between remote port transmissions) ³ (Number of remote ports ´ 50 ms)

Broadcast reception

It is possible to broadcast to all ports on the network using UDP sockets.

Receive side: Specify the transmission source IP address to be "0.0.0.0".

Specify the UDP port number for the broadcast transmitting socket as the

transmission source UDP port number.

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g. UDP reception processing example (Socket status monitoring type)

Ladder program flowchart

Error result

UDP reception processing start

The processing in this section can be

performed at this stage or at the point the

instruction terminates abnormally.

Socket status read/verify

Are bits C and E both 1?

(Opened state?)

The specified UDP socket is in the closed

state. (Open processing is required.)

Yes

The specified UDP socket has not received

data.

Is bit A set to 1?

(Reception text present.)

Yes

Execute a UDP receive request

(CMD = 0033H).

Hold the input of function block in the

on state until the RECV instruction

completes.

Instruction

completion

Verify the status

An error occurred in reception processing.

The specified socket could not receive the

data.

Handle the error according to the

completion and socket status.

Normal complete?

Yes

Terminate UDP reception processing

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h. UDP reception processing example (Receive request issued first type)

Ladder program flowchart

Error result

UDP reception processing start

The processing in this section can be

performed at this stage or at the point the

instruction terminates abnormally.

Socket status read/verify

Are bits C and E both 1?

(Opened state?)

The specified UDP socket is in the closed

state. (Open processing is required.)

Yes

Execute a UDP receive request

(CMD = 0033H).

Hold the input of function block in the

on state until the RECV instruction

completes.

Instruction

completion

Verify the status

Did

the operation

complete before being

timed out?

Text was not received within the time limit.

Yes

An error occurred in reception processing.

The specified socket could not receive the

data.

Handle the error according to the

completion and socket status.

Normal complete?

Yes

Terminate UDP reception processing

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4. UDP close request (using the SEND instruction)

a. Function

Close the open UDP socket.

Release the (unlimited wait state) receive request and terminate the UDP socket.

b. Transfer parameters

3100H

CMD = 0034H

SportNO

Module designation

Command number

A+1

A+2

Socket identifier (1 to 8)

c. Status (See figure 4.3 for details on bits C, D, E and F.)

SportNO

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

SportNO: Socket identifier (1 to 8)

TermSTS:See tables 4.3 and 4.4.

Detail information: See table 4.5.

d. Important items

UDP close requests are processed with the highest priority and other executing requests are

discarded, even if the object socket is executing a UDP open, send, or receive request. Other

requests during the execution of this request will be discarded.

The next open request for the object socket can be executed as soon as the close request

completes normally.

An error is returned if a close request is issued for a socket that is not yet opened.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Unopened (0081H)

An error is returned if a value other than 1 to 8 is specified as the socket identifier.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Illegal socket identifier (0082H)

A UDP receive request will result in an error being returned if an unlimited wait state UDP

receive request is terminated with this request.

Status: Transmission completion timeout (TermSTS = 06H)

Supplement:

The T2N sees its requests (module control and socket interface transmission) to the Ethernet

Port as being "transmission" requests. As a result, when a request is forcibly terminated and a

response is not received from the Ethernet Port, the result is a send request timeout even if the

instruction was a RECV instruction.

If the T2N internal completion wait time limit (2 seconds) is exceeded for this request, the error

listed below is returned.

Status: Send completion timeout (TermSTS = 06H)

In this case, first verify that the Ethernet Port is not in the down state by checking the station

status, and then verify the open/closed state of the socket in the socket status.

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e. UDP close processing example

Ladder program flowchart

Error result

UDP close processing start

Socket status read/verify

The specified UDP socket is already in the

closed state.

Are bits C and E both 1?

(Opened state?)

Yes

Execute a UDP close request

(CMD = 0034H).

Hold the input of function block in the

on state until the SEND instruction

completes.

Instruction

completion

Verify the status

An error occurred in the close processing

and the specified socket could not be

closed.

Handle the error according to the

completion and socket status.

Normal complete?

Yes

Terminate UDP close processing

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5. TCP open request (using the SEND instruction)

a. Function

This request opens (active/passive) any of the eight sockets.

Transmission protocol: TCP/IP

b. Transfer parameters

Module designation

Command number

Socket identifier (1 to 8)

Open type

3100H

CMD = 0035H

SportNO

A+1

A+2

A+3

A+4

A+5

Kind

Remote port IP address

DIPAddress

Remote port object socket TCP port number

Local port specified socket TCP port number

Open wait timeout time

A+6

A+7

A+8

DTCP_PORTNO

STCP_PORTNO

TimeCNT

Open type (1 or 2)

1: Active open (client side)

2: Passive open (server side)

Open wait timeout time: specified in 0.1 second units. (1 to 65535) If zero is specified, the

system is set to an unlimited (infinite) wait state.

c. Status (See figure 4.3 for details on bits C, D, E and F.)

SportNO

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

SportNO: Socket identifier (1 to 8)

TermSTS:See tables 4.3 and 4.4.

Detail information: See table 4.5.

d. Important items

After this request completes normally, TCP send, receive or close requests can be sent to the

socket.

An error is returned if an open request is issued for an already open socket.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Already open (0080H)

An error is returned if a value other than 1 to 8 is specified as the socket identifier.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Illegal socket identifier (0082H)

An error will be returned if a value outside the range 1024 to 65535 is specified for the local

port specified socket TCP port number.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Port number error (0071H)

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Not only must the specified socket TCP port number on the local port not overlap with any

TCP port number already in use in a local port socket, but it also must not overlap with any

UDP port numbers or UDP port numbers used for message transmission. An error will

occur if the port number overlaps.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Already open (0080H)

A connection to the local port itself cannot be established, even if the local port IP address is

specified as the remote port IP address.

Values in the range 1024 to 65535 can be specified as the object socket TCP port number for

the remote port. An error will be returned if a value outside that range is specified.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Port number error (0071H)

An error will be returned if the open timeout time is exceeded.

¬The passive open timeout

Status: Transmission error (TermSTS = 0BH)

Detailed information: Timeout(0020H)

•The active open timeout

Status: Transmission complete timeout (TermSTS = 06H)

While the open wait timeout limit can be set to any value in the range 0.1 to 6553.5 seconds or

unlimited (infinite), we recommend that the timeout limit be set in the range 0.1 to 32

seconds for active opens. This is because the Ethernet Port processing continuation time for

active open processing is 32 seconds. Even if the timeout limit is set to a value over 32

seconds, once 32 seconds has elapsed, the open processing will never actually be performed.

The system will be in an idle state until the specified time has elapsed.

When a passive open operation is executed, the specified socket goes to the active open wait

state. If the DIPAddress and DTCP_PORTNO values are set to 0, the socket is set to the state

in which a particular remote port is not specified. (In this state the socket can handle an active

open from any other (i.e., any remote) port on the network.)

A connection is established by an active open from another socket applied to a socket in the

passive open state. A connection cannot be established by a passive open from another socket

applied to a socket in the passive open state. Similarly, a connection cannot be established by

an active open from another socket applied to a socket in the active open state.

For a socket in the passive open state, it is not possible to open multiple connections from other

ports by issuing multiple active opens.

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e. TCP open processing example

Ladder program flowchart

Error result

TCP open processing start

Socket status read/verify

Are bits C and D both 0?

(Closed state?)

The specified socket is already open

(active or passive).

Yes

Execute a TCP open request

(CMD = 0035H).

Active or passive

open

Hold the input of function block in the

on state until the SEND instruction

completes.

Instruction

completion

Verify the status

Did

the operation

complete before being

timed out?

Connection could not be established within

the time limit.

Yes

An error occurred during open processing

and the connection could not be

established.

Handle the error according to the

completion and socket status.

Normal complete?

Yes

Terminate TCP open processing

(Connection established)

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6. TCP send request (using the SEND instruction)

a. Function

This request sends local port register data using an open TCP socket.

Amount of data sent: 1 to 1000 words

b. Transfer parameters

Module designation

Command number

Socket identifier (1 to 8)

3100H

CMD = 0037H

SportNO

A+1

A+2

A+3

A+4

A+5

Transmission data length: 1 to 1000 words

Transmission data storage register type code

Transmission data storage register number

WordSize

SRID

StreqNOD

Transmission data storage register type code: Type code for the register that holds the

transmission data. (See Figure 5.1)

Transmission data storage register number:

Starting number of the registers that hold the

transmission data.

c. Status (See figure 4.3 for details on bits C, D, E and F.)

SportNO

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

SportNO: Socket identifier (1 to 8)

TermSTS:See tables 4.3 and 4.4.

Detail information: See table 4.5.

d. Important items

Send requests complete at the point they are stored in the Ethernet Port. This is to allow the

send to be performed later even if that send request cannot be executed immediately due to

network congestion or other problems. The Ethernet Port can store up to three requests per

socket, and the Ethernet Port returns an error for send requests that it cannot store.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Timeout(0020H)

The T/C register flag data is not transmitted if the T/C registers are not specified as storage

registers for transmitted data.

An error is returned if a send request is issued for a socket that is not yet opened.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Unopened (0081H)

An error is returned if a value other than 1 to 8 is specified as the socket identifier.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Illegal socket identifier (0082H)

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An error will be returned if a value of 0 words or 1001 or more words is specified as the

transmission data size.

Status: Transmission word count error (TermSTS = 09H)

The T2N performs an area check for the register area based on the transmission data storage

Status: Boundary error (TermSTS = 0AH)

If a close request from the remote port TCP socket has arrived while a connection is

established, and the user program issues a send request, the Ethernet Port returns the following

error.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Unopened (0081H)

Verify the socket status (see section 6.3) RCLOSE and CONN bits, and close the socket.

With a connection established, if a no response state from the remote port continues when data

is sent and the Ethernet Port internal resend processing times out (the timeout time is about 1

minute), the NOACK bit in the socket status will be set to 1. User programs should close such

sockets. Errors will be returned for send/receive requests issued in this state.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Protocol error (0091H)

However, note that the Ethernet Port will return normal complete responses for TCP send

requests issued prior to the timeout, since the send requests from the T2N are stored internally

by the Ethernet Port.

When the number of send requests that can be stored is exceeded, errors will be returned for

that and all following send requests.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Timeout (0020H)

One of the following problems may have occurred when there is no response from the remote

port:

The remote port may have gone down.

Power may have been lost.

The remote ports and/or local port may have become disconnected from the network.

If the T2N internal completion wait time limit (2 seconds) is exceeded for this request, the error

listed below is returned.

Status: Send completion timeout (TermSTS = 06H)

In this case, first verify that the Ethernet Port is not in the down state by checking the station

status, and then perform the required error handling.

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The Ethernet Port uses a priority ordering in processing sockets 1 through 8. Therefore,

systems constructed so that socket 1 is activated frequently may not be able to process socket 8,

resulting in the following error response:

Status: Send completion timeout (TermSTS = 06H)

When constructing a system, take the socket utilization conditions into account when allocating

sockets. Since the send/receive processing for each socket requires about 50 ms, applications

that issue send or receive requests to a given socket should leave an interval of at least 50 ms

times the number of sockets used between each request.

(Interval between requests to the same socket) ³ (Number of sockets used ´ 50 ms)

Similarly, the above intervals averaging 50 ms should be left between transmissions from

remote ports to the local port.

(Interval between remote port transmissions) ³ (Number of remote ports ´ 50 ms)

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e. TCP transmission processing example

Ladder program flowchart

Error result

TCP transmission processing start

The processing in this section can be

performed at this stage or at the point the

instruction terminates abnormally.

Socket status read/verify

A connection has not been established with

the specified TCP socket. (Open processing

is required.)

Are bits B and F both 1?

(Is a connection established?)

Yes

The specified TCP socket is either:

• Closed by the remote port, or

• Not responding.

Are bits 8 and 9 both 0?

(In neither the RCLOSE nor NOACK

state?)

(The socket must be closed by the local

port.)

Yes

Execute a TCP send request

(CMD = 0037H).

Hold the input of function block in the

on state until the SEND instruction

completes.

Instruction

completion

Verify the status

An error occurred in transmission

processing.

Transmission from the specified socket is

not possible.

Handle the error according to the

completion and socket status.

Normal complete?

Yes

Terminate TCP transmission

processing

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7. TCP receive request (using the RECV instruction)

a. Function

If an opened TCP socket receives data, read the received data into registers on the local T2N.

If no data has been received, wait until data arrives (the wait time can be set) and then, after

reception, read the received data into the local T2N registers.

Reception data size: 1000 words (fixed)

b. Transfer parameters

Module designation

3100H

CMD = 0038H

SportNO

WordSize

DRID

Command number

A+1

A+2

A+3

A+4

A+5

A+6

Socket identifier (1 to 8)

Reception data length: 1000 words

Reception data storage register type code

Reception data storage register number

Reception wait timeout time

DregNO

TimeCNT

Reception data length:

This parameter must be set to 1000 words.

Reception data storage register type code: Type code for the register that holds the received

data. (See Figure 5.1)

Reception data storage register number:

Starting number of the registers that hold the received

data.

Reception wait timeout time:

specified in 0.1 second units. (1 to 65535)

If zero is specified, the system is set to an unlimited

(infinite) wait state.

c. Status (See figure 4.3 for details on bits C, D, E and F.)

SportNO

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

SportNO: Socket identifier (1 to 8)

TermSTS:See tables 4.3 and 4.4.

Detail information: See table 4.5.

d. Methods for storing reception data

Applications must allocate a reception data storage area of 1001 words. The reception data

count and the reception data (the data received by the object socket at the point the receive

request was issued) will be stored in this area as shown below.

Reception data count (bytes)

¬ Start of the specified

Reception data storage

Reception data

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The T2N checks for register area allocation of the reception data size plus one word and

returns an error if the register area does not exist.

Status: Boundary error (TermSTS = 0AH)

In this case, data is not transferred to the register area, and the data is discarded. The data is

not retained in the Ethernet Port either.

e. Important items

An error is returned if a receive request is issued for a socket that is not yet opened.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Unopened (0081H)

An error is returned if a value other than 1 to 8 is specified as the socket identifier.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Illegal socket identifier (0082H)

An error will be returned if a value of 0 words or 1001 or more words is specified as the

reception data size.

Status: Transmission word count error (TermSTS = 09H)

An error will be returned if the reception timeout time is exceeded.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Timeout(0020H)

If a close request from the remote port TCP socket has arrived while a connection is

established, and the user program issues a receive request, the Ethernet Port returns the

following error. Issuing a receive request in the receive wait state will also result in the

following error being returned.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Unopened (0081H)

Verify the socket status (see section 6.3) RCLOSE and CONN bits, and close the socket.

Allocate a reception data storage register area per a socket with a size equal to the size of

the transmission data plus one word.

If the reception data size is larger than the reception data size of the receiving Ethernet Port,

the size of transmission data for the single operation and the size of reception data at that time

is transmitted to the T2N’s reception data storage register area.

Since a TCP receive request merely places the socket in the receive wait state, it cannot detect

remote ports that are not responding. Use one of the following methods to prevent this state.

Monitor for a no-response state by sending data periodically over a separate (different)

TCP connection.

Execute a remote port presence verification request for the remote port periodically. (See

section 7.3.)

Monitor the interval between data receptions when data is being received periodically.

(Receive request issued first type: specify a limited timeout limit.)

(Socket status monitoring type: monitor the interval between points when the received text

present bit is set to the on state.)

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One of the following problems may have occurred when there is no response from the remote

port:

The remote port may have gone down.

Power may have been lost.

The remote ports and/or local port may have become disconnected from the network.

In the Ethernet Port TCP socket interface, when reception data in the Ethernet Port is

read out by a receive request from the T2N, the Ethernet Port sends an ACK

(acknowledge response) to the port that sent the data. Since an ACK will not be sent to the

sending port if the received data remains in the Ethernet Port if the T2N does not read out that

received data, the sending port will resend the data. If this state continues for a predetermined

period, the sending port may will decide that the TCP connection is abnormal and close the

connection. To prevent this from occurring, the T2N software should monitor the RCV (receive

data present) bit and issue receive requests when necessary.

With TCP receive requests, the amount of data transferred to the reception data storage register

area will differ with both the timing with which the T2N issued the receive request and the

timing with which the data arrives at the Ethernet Port. To handle single units of transmission

data on the receiving side as single units as well, the user software on the receiving side must

recognize the end of the transferred data (either by using counts in the transmitted data or by

including an end marker in the transmitted data) and iterate receive requests until all the

transmitted data has been received.

User programs must save all incoming data so that the register area used to transfer data to the

T2N is not overwritten when using iterated receive requests.

The Ethernet Port uses a priority ordering in processing sockets 1 through 8. Therefore,

systems constructed so that socket 1 is activated frequently may not be able to process socket 8,

resulting in the following error response:

Status: Send completion timeout (TermSTS = 06H)

When constructing a system, take the socket utilization conditions into account when allocating

sockets. Since the send/receive processing for each socket requires about 50 ms, applications

that issue send or receive requests to a given socket should leave an interval of at least 50 ms

times the number of sockets used between each request.

(Interval between requests to the same socket) ³ (Number of sockets used ´ 50 ms)

Similarly, the above intervals averaging 50 ms should be left between transmissions from

remote ports to the local port.

(Interval between remote port transmissions) ³ (Number of remote ports ´ 50 ms)

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TCP reception processing example (Socket status monitoring type)

Ladder program flowchart

Error result

TCP reception processing start

The processing in this section can be

performed at this stage or at the point the

instruction terminates abnormally.

Socket status read/verify

A connection has not been established with

the specified TCP socket. (Open processing

is required.)

Are bits B and F both 1?

(Is a connection established?)

Yes

The specified TCP socket is:

• Closed by the remote port

Is bit 9 set to 0?

(In the state other than RCLOSE?)

(The socket must be closed by the local

port.)

Yes

The specified TCP socket has not received

data.

Is bit A set to 1?

(Reception text present.)

Yes

Execute a TCP receive request

(CMD = 0038H).

Hold the input of function block in the

on state until the RECV instruction

completes.

Instruction

completion

Verify the status

An error occurred in reception processing.

The specified socket coule not receive the

data.

Handle the error according to the

completion and socket status.

Normal complete?

Yes

Terminate TCP reception processing

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g. TCP reception processing example (Receive request issued first type)

Ladder program flowchart

Error result

TCP reception processing start

The processing in this section can be

performed at this stage or at the point the

instruction terminates abnormally.

Socket status read/verify

A connection has not been established with

the specified TCP socket. (Open processing

is required.)

Are bits B and F both 1?

(Is a connection established?)

Yes

The specified TCP socket is:

• Closed by the remote port

Is bit 9 set to 0?

(In the state other than RCLOSE?)

(The socket must be closed by the local

port.)

Yes

Execute a TCP receive request

(CMD = 0038H).

Hold the input of function block in the

on state until the RECV instruction

completes.

Instruction

completion

Verify the status

Did

the operation

complete before being

timed out?

Text was not received within the time limit.

Yes

An error occurred in reception processing.

The specified socket could not receive the

data.

Handle the error according to the

completion and socket status.

Normal complete?

Yes

Terminate TCP reception processing

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8. TCP close request (using the SEND instruction)

a. Function

Close the open TCP socket.

Release the (unlimited wait state) receive request and terminate the TCP socket.

b. Transfer parameters

Module designation

Command number

Socket identifier (1 to 8)

3100H

CMD = 0039H

SportNO

A+1

A+2

c. Status (See figure 4.3 for details on bits C, D, E and F.)

SportNO

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

SportNO: Socket identifier (1 to 8)

TermSTS:See tables 4.3 and 4.4.

Detail information: See table 4.5.

d. Important items

TCP close requests are processed with the highest priority and other executing requests are

discarded, even if the object socket is executing a TCP open, send, or receive request. Other

requests during the execution of this request will be discarded.

An error is returned if a close request is issued for a socket that is not yet opened.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Unopened (0081H)

An error is returned if a value other than 1 to 8 is specified as the socket identifier.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Illegal socket identifier (0082H)

A TCP receive requests will result in an error being returned if an unlimited wait state

TCP open request/receive request is terminated with this request.

Status: Transmission completion timeout (TermSTS = 06H)

Supplement:

The T2N sees its requests (module control and socket interface transmission) to the Ethernet

Port as being "transmission" requests. As a result, when a request is forcibly terminated and a

response is not received from the Ethernet Port, the result is a send request timeout even if the

instruction was a RECV instruction.

If a close request is comes from the remote port TCP socket while a connection is established,

the local port must also close the socket. As a technique for checking for the reception of close

requests from the remote TCP socket, user programs should monitor the RCLOSE and CONN

bits in the socket status. (See section 6.3.)

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If a close request is sent from the Ethernet Port TCP socket while a connection is established,

The T2N cannot reopen request using the same port number of the closed port number for 10

seconds or more since the Ethernet Port is set the close request.

Supplement:

On engineering workstation and personal computer systems, it may not be possible to reopen

a TCP socket on the port that performed the close processing for a fixed period.

The Ethernet Port which received a close request from the T2N replies to be received the T2N.

Therefore, a close request of the T2N completes the no waiting time. The Ethernet Port send a

close request to a remote port and is waiting for a close request from a remote port.

If the T2N executes a open request in the same port number while the Ethernet Port is waiting

for a close request from a remote port, a open request will result in an error being returned.

Status: Transmission error (TermSTS = 0BH)

Detailed information: Opened (0080H) or

LAN controller driver error (0090H/0092H)

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e. TCP close processing example

Ladder program flowchart

Error result

TCP close processing start

This is not necessary in processing for which

the RCLOSE and NOACK bits have

become 1.

Socket status read/verify

Are bits B and F both 1?

(Is a connection established?)

The specified UDP socket is already in the

closed state.

Yes

Execute a TCP close request

(CMD = 0039H).

Hold the input of function block in the

on state until the SEND instruction

completes.

Instruction

completion

Verify the status

An error occurred in the close processing

and the specified socket could not be

closed.

Handle the error according to the

completion and socket status.

Normal complete?

Yes

Terminate TCP close processing

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6.5 Sample Programs

This section presents sample programs using UDP and TCP sockets.

1. UDP sockets

This is a sample program that issues the requests used with UDP sockets. It assumes that the

parameter set up and operating mode control requests (run mode/socket interface transmission

enable) have already completed.

a. UDP open request

This program issues a UDP open request for socket number 2 on the Ethernet Port.

This ladder program is executed by turning on the A contact on the R0620.

Parameters:

12544: 3100H, 00049: 0031H

UDP port number: 4000

| /* UDP open request: executed when R0620 is set on.

|R0620

1|-| |-+[12544 MOV RW000][00049 MOV RW001]----------------------------|

/* Module designation, CMD number setup

+[00002 MOV RW002][04000 MOV RW003]----------------------------|

/* Socket identifier, UDP port number setup */

+[RW000 SEND RW010][RST R0620]---------------------------------|

/* Turn R0620 off after request setup and completion. */

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b. UDP close request

This program issues a UDP close request for socket number 2 on the Ethernet Port.

This ladder program is executed by turning on the A contact on the R0623.

Parameters: 12544: 3100H, 00052: 0034H

| /* UDP close request: executed when R0623 is set on. */

|R0623

1|-| |-+[12544 MOV RW000][00052 MOV RW001]----------------------------|

/* Module designation, CMD number setup

+[00002 MOV RW002]---------------------------------------------|

/* Socket identifier setup */

+[RW000 RECV RW010][RST R0623]---------------------------------|

/* Turn R0623 off after request setup and completion. */

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c. UDP send request

This program issues a UDP send request for socket number 2 on the Ethernet Port.

This ladder program is executed by turning on the A contact on the R0622.

Parameters: 12544: 3100H, 00050: 0032H

0341995909: 14627185H

Transmission destination IP address: 133.113.98.20

Transmission destination object socket UDP port number: 3000

Transmission data word count: 1000

Transmission data storage registers: D1000 and above

| /* UDP send request: executed when R0622 is set on. */

|R0622

1|-| |-+[12544 MOV RW000][00050 MOV RW001]----------------------------|

/* Module designation, CMD number setup */

+[00002 MOV RW002]---------------------------------------------|

/* Socket identifier setup */

+[0341995909 DMOV RW004· RW003][03000 MOV RW005]----------------|

/* Remote port IP address, port number setup */

+[01000 MOV RW006]---------------------------------------------|

/* Transmission data word count setup

+[00004 MOV RW007][01000 MOV RW008]----------------------------|

/* Transmission data storage register type, storage register

|number setup */

+[RW000 SEND RW010][RST R0622]---------------------------------|

/* Turn R0622 off after request setup and completion. */

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d. UDP receive request

This program issues a UDP send request for socket number 2 on the Ethernet Port.

This ladder program is executed by turning on the A contact on the R0621.

Parameters: 12544: 3100H, 00051: 0033H

0341995909: 14627185H

Transmission source IP address: 133.113.98.20

Transmission source object socket UDP port number: 3000

Reception data word count: 1000

Reception data storage registers: D2500 and above

Reception timeout time: 1800 seconds

| /* UDP receive request: executed when R0621 is set on. */

|R0621

1|-| |-+[12544 MOV RW000][00051 MOV RW001]----------------------------|

/* Module designation, CMD number setup

+[00002 MOV RW002]---------------------------------------------|

/* Socket identifier setup */

+[0341995909 DMOV RW004· RW003][03000 MOV RW005]----------------|

/* Remote port IP address, port number setup */

+[01000 MOV RW006]---------------------------------------------|

/* Reception data word count setup */

+[00004 MOV RW007][02500 MOV RW008][18000 MOV RW009]-----------|

/* Reception data storage register type, storage register

|number, timeout time setup */

+[RW000 RECV RW010][RST R0621]---------------------------------|

/* Turn R0621 off after request setup and completion. */

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2. TCP sockets

This is a sample program that issues the requests used with TCP sockets. It assumes that the

parameter set up and operating mode control requests (run mode/socket interface transmission

enable) have already completed.

a. TCP open request (passive)

This program issues a TCP open request (passive) for socket number 8 on the Ethernet Port.

This ladder program is executed by turning on the A contact on the R0630.

Parameters: 12544: 3100H, 00053: 0035H

341995909: 14627185H

Remote port IP address: 133.113.98.20

Remote port object socket TCP port number:

Local port specified socket TCP port number:

Open request timeout time: 1800 seconds

4000

| /* TCP passive open request: executed when R0630 is set on. */

|R0630

1|-| |-+[12544 MOV RW000][00053 MOV RW001]----------------------------|

/* Module designation, CMD number setup */

+[00008 MOV RW002][00002 MOV RW003]----------------------------|

/* Socket identifier, open type setup

+[0341995909 DMOV RW005· RW004][04000 MOV RW006]----------------|

/* Remote port IP address and port number setup */

+[04000 MOV RW007][18000 MOV RW008]----------------------------|

/* Local port number, timeout time setup

+[RW000 SEND RW010][RST R0630]---------------------------------|

/* Turn R0630 off after request setup and completion. */

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b. TCP open request (active)

This program issues a TCP open request (active) for socket number 8 on the Ethernet Port.

This ladder program is executed by turning on the A contact on the R0640.

Parameters:

12544: 3100H, 00053: 0035H

341995909: 14627185H

Remote port IP address: 133.113.98.20

Remote port object socket TCP port number:

Local port specified socket TCP port number:

Open request timeout time: 1800 seconds

4000

| /* TCP active open request: executed when R0640 is set on. */

|R0640

1|-| |-+[12544 MOV RW000][00053 MOV RW001]----------------------------|

/* Module designation, CMD number setup */

+[00002 MOV RW002][00001 MOV RW003]----------------------------|

/* Socket identifier, open type setup

+[RW106· RW105 DMOV RW005· RW004][RW107 MOV RW006]---------------|

/* Remote port IP address and port number setup */

+[RW107 MOV RW007][18000 MOV RW008]----------------------------|

/* Local port number, timeout time setup

+[RW000 SEND RW010][RST R0640]---------------------------------|

/* Turn R0640 off after request setup and completion. */

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c. TCP close request

This program issues a TCP close request for socket number 8 on the Ethernet Port.

This ladder program is executed by turning on the A contact on the R0633.

Parameters: 12544: 3100H, 00057: 0039H

| /* TCP close request: executed when R0633 is set on. */

|R0633

1|-| |-+[12544 MOV RW000][00057 MOV RW001]----------------------------|

/* Module designation, CMD number setup

+[00008 MOV RW002]---------------------------------------------|

/* Socket identifier setup */

+[RW000 SEND RW010][RST R0633]---------------------------------|

/* Turn R0633 off after request setup and completion. */

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d. TCP send request

This program issues a TCP send request for socket number 8 on the Ethernet Port.

This ladder program is executed by turning on the A contact on the R0632.

Parameters: 12544: 3100H, 00055: 0037H

Transmission data word count: 1000

Transmission data storage registers: D1000 and above

| /* TCP send request: executed when R0632 is set on. */

|R0632

1|-| |-+[12544 MOV RW000][00055 MOV RW001]----------------------------|

/* Module designation, CMD number setup */

+[00008 MOV RW002]---------------------------------------------|

/* Socket identifier setup */

+[01000 MOV RW003]---------------------------------------------|

/* Transmission data word count setup

+[00004 MOV RW004][00000 MOV RW005]----------------------------|

/* Transmission data storage register type, storage register

|number setup */

+[RW000 SEND RW010][RST R0632]---------------------------------|

/* Turn R0632 off after request setup and completion. */

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e. TCP receive request

This program issues a TCP receive request for socket number 8 on the Ethernet Port.

This ladder program is executed by turning on the A contact on the R0631.

Parameters: 12544: 3100H, 00056: 0038H

Reception data word count: RW103

Reception data storage registers: D4000 and above

Reception data transfer destination registers: D1001 and above

Reception timeout time: 1800 seconds

| /* TCP receive request: executed when R0631 is set on. */

|R0631

1|-| |-+[12544 MOV RW000][00056 MOV RW001]----------------------------|

/* Module designation, CMD number setup

+[00008 MOV RW002][RW103 MOV RW003]----------------------------|

/* Socket identifier, reception data word count setup */

+[00004 MOV RW004][04000 MOV RW005][18000 MOV RW006]-----------|

/* Reception data storage register type, register number,

|timeout time setup */

+-|^|-+[00004 MOV RW021][04001 MOV RW022]----------------------|

| /* Data transfer source register type, number setup

+[00001 MOV RW025]---------------------------------------|

| /* Data transfer count setup

+[00004 MOV RW023][01001 MOV RW024]----------------------|

| /* Data transfer destination register type, number setup */

+[RW103 +

01000 -> RW008]-----------------------------|

/* Transmission event count setup */

+[SET R0635][RST R0631]----------------------------------------|

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| /* TCP fragmented data reception processing */

|R0635 R063D

2|-| |-+-|/|--[RW000 RECV RW010][SET R063D]----------------------------|

/* Request setup

|R063D

+-| |-+-|^|--[RTR1D4000]----------------------------------------|

/* Reception data count conversion (bytes to

|words) */

|R063E

+-|/|-+[RW021 XFER RW025 -> RW023]-----------------------|

/* Reception data transfer (D4001 to D1001) */

+[ +1 RW009][ +1 RW022][ +1 RW024]------------------|

/* Increment address and pointer. */

R063E |

+[RW009 >= D4000]------------------------------------( )--|

/* Reception data size check

|R063E

+-| |-+[RW008 > RW024][ RST R063D]-----+[ 00000 MOV RW009]|

+[ 04001 MOV RW022]|

/* Processing for data less than the reception

|data size */

+[RW008 <= RW024]-----+[ RST R063D]-----------------|

+[ 00000 MOV RW009][RST R0635]|

/* Processing for data greater than the

|reception data size */

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7. RAS Information

This chapter describes the following RAS functions provided by the Ethernet Port.

CAUTION

1. Chapter 7 presents information related to using the functions provided by the Ethernet Port from a

T2N, including the instruction (request) format, important items that require attention, and sample

programs.

Make a point of understanding the content of chapter 4 thoroughly before writing programs that use

the Ethernet Port. The sample programs present basic examples of Ethernet Port usage, and should

be reviewed carefully before use in an actual system.

1. Ethernet Port status information

Station status (T2N special registers)

Down information (T2N interface buffer)

2. Test functions from user programs

Remote port verification request (corresponds to the UNIX ping command)

Inter-port loopback test (between T2N and T2N/T3H units)

3. Time setting function

4. Information provided by RAS information readout

LAN controller (network circuit) information

Protocol state

State of the T2N-Ethernet Port interface

Event trace

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7.1 T2N Special Relays and Registers

The Ethernet Port status information is reflected in the T2N special relays and special registers.

a. Special relays (the renewing cycle of 100 ms)

Special relay

Name

Function

S000B

Ethernet Port error

(warning)

1: The installed Ethernet Port unit is down.

(The T2N continues to operate.)

0: Reset the system from a user program after resolving the

error in the down Ethernet Port.

b. Special registers

T2N read out the internal station status of Ethernet Port and copy the SW register (the

renewing cycle of 100 ms).

Special registers Name

SW063

CH1 station status

c. Station status format

DOWN

STBY

MTEN

TEST

INZ

RUN

STEN

Bit F: DOWN (down)...........................................1: Down mode, 0: Other than down mode

Bit E: INZ (initialization).....................................1: Initialization in progress

0: Initialization completed

Bit D: STBY (standby).........................................1: Standby mode

0: Other than standby mode

Bit C: RUN (run)..................................................1: Run mode, 0: Other than run mode

Bit 5: MTEN (Message transmission)..................1: Enabled, 0: Prohibited

Bit 4: STEN (socket interface transmission).........1: Enabled, 0: Prohibited

Bit 0: TEST (test).................................................1: Test function execution in progress

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d. Operation mode and station status of Ethernet Port

Each bit of station status has the following mean. If you want to judge the mode

(initialize mode/ run mode/ standby mode), look at the value of the register.

The mode of Ethernet Port

During initialize (Power on / Reset request)

Standby mode (initialize processing normally complete)

Run mode : Allows the message transmission

Run mode : Allows the socket interface

The station status

4000H

2000H

1020H

1010H

Run mode : Allows the message transmission

and socket interface

1030H

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7.2 Down Information

When an Ethernet Port goes to down mode, the factor that caused that transition is stored in the

T2N interface buffer as one word of data. This data can be read by the T2N with the READ

instruction.

Table 7.1 lists the down information error codes and the factors that caused the transition to down

mode.

Table 7.1 Down Information

Error code (H)

0010

Interpretation

Watchdog timeout

0020

Memory bus stall

0030

A TRAP occurred

0040

Jabbering timeout

0050

0160

0260

0360

0500, 0501

0502, 0503

0504

LAN controller check error

ROM BCC check data match error

System RAM area check error

T2N interface buffer check error

Semaphore acquisition error

MBX receive error

0505

MBX send error

0506

0507

0508

TCP resend queue full

Acquired buffer in use

Error in acquiring initial buffer

Important items

This is a read-only area. Do not write to this area with the WRITE instruction. Subsequent reads

will not return correct down information.

Sample: Down information readout

|R0000

1|-| |--[04081 MOV RW010][00001 MOV RW011][H00FE READ RW010 -> D1000]--|

READ instruction description

H00FE: Module designation ... Ethernet Port must specify H00FE.

RW010: Specifies the 04081 (0FF1H) down information area.

0FF1H is the down information area for the Ethernet Port.

RW011: Specifies the number of words (00001) to be read out.

D1000: Specifies the register in which to store the read out down information.

In this case, the down information that is read out is stored in D1000.

The down information is stored in D1000 by turning R0000 on.

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7.3 Remote Port Verification Request

This request verifies the existence of the specified remote port, and corresponds to the UNIX ping

command. This request can be issued when the Ethernet Port operating mode is either run or

standby mode. The Ethernet Port will respond to this request if its operating mode is either run or

standby mode.

Remote port verification request (using the SEND instruction)

a. Function

This is a request that verifies the existence of the specified remote port.

b. Transfer parameters

3100H

Module designation

CMD number

A+1

A+2

A+3

CMD = 0014H

D- IP address

IP address of the remote station whose

existence is to be verified.

(The input format is the same as that for the

parameter setup request.)

c. Status (See figure 4.3 for details on bits C, D, E and F.)

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

d. Important items

This request is possible in run and standby modes. (The IP address of the local port must be set

up.)

The Ethernet Port returns a response to this request in run and standby modes. (The IP address

of the local port must be set up.)

If the remote port exists:

Normal return

If the remote port does not exist (within 4 seconds):

Status:

Transmission error (TermSTS = 0BH)

Detailed information: Timeout occurred (0020H)

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e. Sample program

This sample ladder program issues a remote port verification request to the Ethernet Port.

This program is executed by turning on the R0504 A point.

Parameters: 12544:3100H, 00020:0014H, 341995909;14627185H

85H. 71H. 62H. 14H

133. 113. 98. 20

|R0504

R0604 |

1|-| |-----------------------------------------------------------( )--|

/* Remote port verification request */

|R0604

2|-| |-+[12544 MOV RW000][00020 MOV RW001]----------------------------|

/* Designates the module and sets the CMD number. */

+[341995909 DMOV RW003· RW002]----------------------------------|

/* Sets remote port IP address */

+[RW000 SEND RW010][RST R0504]---------------------------------|

/* Sets the request. */

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7.4 Remote Port Loopback (for an Ethernet Port)

This request sends test data to the specified remote Ethernet Port (T2N/T3H) and verifies that

transmission is being performed correctly by receiving that data looped back from the remote port.

A user program must compare the transmitted and received data for equivalence.

Remote port loopback request (using the SEND instruction)

a. Function

This request sends test data to the specified remote Ethernet Port (T2N/T3H) and verifies that

transmission is being performed correctly by receiving that data looped back from the remote port.

The T2N OS creates the test data.

b. Transfer parameters

3100H

CMD = 000FH

WordSize

SRID

Module designation

A+1

A+2

A+3

A+4

A+5

A+6

A+7

A+8

A+9

CMD number

Loopback data length: 1 to 485 words

Send data storage register type code

Send data storage register number

Loopback data storage register type code

Loopback data storage register number

Timer count

SRegNO

DRID

DRegNO

Timecnt

D-IPAddress

Loopback destination IP address

(The input procedure is the same as that for the parameter

setup request.)

A+10

D-UDP PortNO

Loopback destination message transmission UDP port number

c. Status (See figure 4.3 for details on bits C, D, E and F.)

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

d. Important items

This request cannot be executed unless message transmission is enabled with an operating

mode control request.

In response to a request from a user program, the T2N OS performs the processing using the

Ethernet Port PC link protocol.

User programs on the loopback destination do not take part in this operation.

A user program must compare the transmitted and loopback data for equivalence.

A transfer word count error (TermSTS = 09H) occurs if the loopback data length exceeds the

range 1 to 485 words (or 1 to 323 words for the T and C registers).

A register specification error (TermSTS = 01H) occurs if a value other than a stipulated value

is specified for the register type codes (SRID/DRID).

A register specification error (TermSTS = 01H) occurs if 0007H (the T register) is specified

for the send data storage register type code and a register other than the T register is specified

for the loopback data storage register type code. This also holds for the C register.

A boundary error (TermSTS = 0AH) occurs if a range spanning both the base T registers (0 to

511) and the expansion T registers (512 to 999) is specified for the T register.

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For data storage registers, a boundary error (TermSTS = 0AH) occurs if the specified area

(start register + register range) does not exist in the local port.

A response timeout error (TermSTS = 02H) occurs if the loopback response time exceeds the

time specified by the timer counter value.

If the local port registers are write protected by setting the special coil, the memory write

protected status (TermSTS = 04H) is returned.

0: Write enabled

1: Write protected

SW067

SW C

RW LW W XW/YW

Special registers

Counter registers

Timer registers

Input/output registers

Link registers

Link relay registers

Auxiliary registers

Data registers

PC internal file registers

Expansion file registers (IC card)

e. Sample program

This sample ladder program issues a remote port loopback request to the Ethernet Port.

This program is executed by turning on the R0092 A point.

A user program must compare the transmitted and loopback data for equivalence.

Parameters:

12544:3100H, 00015:000FH

|R0092

1|-| |-+[12544 MOV W0903][00015 MOV W0904]----------------------------|

/* Designates the module and sets the CMD number. */

+[00485 MOV W0905]---------------------------------------------|

+[00004 MOV W0906][00000 MOV W0907]----------------------------|

/* Sets the loopback data length. */

/* Sets the send source register type and starting register

|number. */

+[00004 MOV W0908][00500 MOV W0909]----------------------------|

/* Sets the loopback destination register type and starting

|register number. */

+[00100 MOV W0910]---------------------------------------------|

/* Sets the response time limit. (10 seconds) */

+[341995909 DMOV W0912· W0911][01025 MOV W0913]-----------------|

/* Loopback destination IP address, message transmission UDP

|port number */

+[W0903 SEND W0914][RST R0092]---------------------------------|

/* Sets the request. */

7.5 Time Setting

The Ethernet Port internal time is set from the T2N. This information is used as the time

information in the Ethernet Port event trace.

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Time set request (using the SEND instruction)

a. Function

This request sets the Ethernet Port internal time from a user program.

b. Transfer parameters

3100H

Module designation

CMD number

A+1

A+2

A+3

A+4

CMD = 0018H

Month

Year

Day

Hour

Seconds

Minute

Enter the year, month, day, hour, minute, and seconds as BCD codes.

The date July 20, 1996 14:30:00 would be entered as:

3100H

0018H

0796H

1404H

0030H

12544

00024

01942

05124

00048

A+1

A+2

A+3

A+4

c. Status (See figure 4.3 for details on bits C, D, E and F.)

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

d. Important items

This request can be executed in run or standby mode.

The time set here is updated by the Ethernet Port internal timer, and thus may get out of

synchronization with the T2N time.

We recommend setting the Ethernet Port time once a day.

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e. Sample program

This sample ladder program issues a time set request to the Ethernet Port.

This program is executed by turning on the R0508 A point.

Parameters: 12544:3100H, 00024:0018H, 01942:0796H, 05124:1404H, 00048:0030H

|R0508

R0608 |

1|-| |-----------------------------------------------------------( )--|

/* Time set request */

|R0608

2|-| |-+[12544 MOV RW000][00024 MOV RW001]----------------------------|

/* Designates the module and sets the CMD number.

+[01942 MOV RW002][05124 MOV RW003][00048 MOV RW004]-----------|

/* Sets the year, month, day, hour, minute, and seconds. */

+[RW000 SEND RW010][RST R0508]---------------------------------|

/* Sets the request. */

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7.6 RAS Information Readout

This request reads out the Ethernet Port RAS information (internal error information and

phenomenon history) from a user program.

RAS information readout request (using the RECV instruction)

a. Function

This request reads out the Ethernet Port RAS information from a user program.

b. Transfer parameters

3100H

CMD = 0015H

DRID

Module designation

A+1

A+2

A+3

A+4

A+5

A+6

CMD number

RAS information storage register type

RAS information storage register start address

RAS request type

DRegNO

Kind

Start

Start position: Valid when Kind is 2 or 4.

Number of items read out: Valid when Kind is 4.

ReadCnt

(1) RAS information storage register type code

This code specifies the type of the register used to store the read out RAS information.

See figure 5.1 for the type codes that can be specified here.

(2) RAS information storage register start address

Specifies the start address for the registers specified by the local port register type code.

(3) RAS request type: specifies the type of RAS information read out

1: RAS counter..............LAN controller (line) information (See table 7.2.)

2: MIB information .......LAN controller interface, IP, TCP, and UDP information

(See tables 7.3 to 7.6.)

3: Maintenance data (Cannot be used.)

4: Event trace information (See table 7.7.)

5: RAS information clear

(4) Start position: Only valid when the readout request type is 2 (MIB information) or 4 (trace

information).

MIB information (2) ...... 0 = MIB_IF

1 = MIB_IP

2 = MIB_TCP

3 = MIB_UDP

Trace information (4)..... 0 to 160; 0 corresponds to the most recent information.

(5) Number of items read out: Only valid when the readout request type is 4 (trace

information).

1 to 30 items.

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c. Status (See figure 4.3 for details on bits C, D, E and F.)

TermSTS

B+1

Detailed information (Only valid when TermSTS = 0BH.)

d. Important items

This request can be used in run and standby modes.

The read out RAS information is stored in the specified register area as shown below.

RAS information

word count

Specified register start address

RAS information

A register area whose size is the size of the read out

RAS information plus one word must be allocated.

A boundary error (TermSTS = 0AH) occurs if it is not possible to allocate an area that is the

size of the read out RAS information plus one word for the RAS information storage area.

A parameter error (TermSTS = 03H) occurs on any of the following transfer parameter

settings.

If the RAS request type (Kind) is out of range (a value other than 1 to 5).

If the start position (Start) is out of range (a value of 4 or larger) for MIB information.

If the start position (Start) is out of range (a value of 161 or larger) for event trace

information.

If the read count (ReadCnt) is out of range (a value of 31 or larger) for event trace

information.

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e. Sample program

This sample ladder program issues a RAS information readout to the Ethernet Port.

This program is executed by turning on the R0505 A contact.

Parameters:

RAS storage registers: Starting at D0000.

RAS request type: Event trace information, reads out 30 items starting with the most

recent data.

12544:3100H, 00021:0015H

|R0505

R0605 |

1|-| |-----------------------------------------------------------( )--|

/* RAS information readout

|R0605

2|-| |-+[12544 MOV RW000][00021 MOV RW001]----------------------------|

/* Designates the module and sets the CMD number.

+[00004 MOV RW002][00000 MOV RW003]----------------------------|

/* Sets the RAS storage register type and start number

+[00004 MOV RW004]---------------------------------------------|

/* Sets the RAS request type. */

+[00000 MOV RW005][00030 MOV RW006]----------------------------|

/* Sets the information readout start position and count. */

+[RW000 RECV RW010][RST R0505]---------------------------------|

/* Sets the request. */

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(1) RAS counters...........................LAN controller (line) information

Reads out 128 words of data using RAS information readout.

RAS information details

Table 7.2 RAS Counters

Symbol

Description

RAS_CNT [0]

RAS_CNT [1]

RAS_CNT [2]

Normal reception count

Bus read error (reception buffer read failure) count

Remote reset packet reception count

(Packets whose Ethernet header type was set to 0900H.)

RAS_CNT [3]

RAS_CNT [4]

RAS_CNT [5]

RAS_CNT [6]

RAS_CNT [7]

RAS_CNT [8]

Short packet (packet length under 60 bytes) reception count

Alignment error (The number of bits in the received data was not divisible by 8.) count

CRC error (received packet CRC check error) count

Overflow (Incoming packets discarded due to full receive buffer.) count

Remaining registers unused

RAS_CNT [127]

(2) MIB information: MIB_IF.......LAN controller interface information

Reads out 13 words of data using RAS information readout.

Table 7.3 MIB_IF

Symbol

Description

MIB_IF [0]

MIB_IF [1]

MIB_IF [2]

MIB_IF [3]

MIB_IF [4]

MIB_IF [5]

MIB_IF [6]

MIB_IF [7]

MIB_IF [8]

MIB_IF [9]

MIB_IF [10]

MIB_IF [11]

MIB_IF [12]

It is possible to use the interface number in this system

Reserved

Lower level layer of IP with interface type of protocol

Progress of time with changing states by the interface

Total number of octets (bytes) received by the interface

Number of non-broadcast/non-multicast packets transferred upstream

Number of broadcast/multicast packets transferred upstream

Number of packets discarded due to reception resource limitation

Number of packets discarded due to format errors

Number of packets sent to an undefined protocol

Total number of octets sent by the interface

Number of packets from upstream that were not broadcast or multicast packets

Number of packets from upstream that were broadcast or multicast packets

Packet:

A unit of data flowing on the transmission path. (See figure 7.1.)

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(3) MIB information: MIB_IP.......IP protocol information

Reads out 17 words of data using RAS information readout.

Table 7.4 MIB_IP

Symbol

Description

MIB_IP [0]

MIB_IP [1]

MIB_IP [2]

MIB_IP [3]

MIB_IP [4]

MIB_IP [5]

MIB_IP [6]

MIB_IP [7]

MIB_IP [8]

MIB_IP [9]

MIB_IP [10]

Indicate IP gateway in action or not action

Default TTL (Time to Live) of IP packet

Total number of IP datagrams received from the interface

Number of IP datagrams discarded due to format errors

Number of IP datagrams discarded due to incorrect delivery.

Number of IP datagrams sent out.

Number of IP datagrams sent to an undefined protocol

Number of IP datagrams transferred to upstream

Number of IP datagrams transferred from upstream

Number of IP datagrams discarded due to not exist route

The maximum number of seconds that maintained reception fragment and waiting

reassembly

MIB_IP [11]

MIB_IP [12]

MIB_IP [13]

MIB_IP [14]

MIB_IP [15]

MIB_IP [16]

Number of received IP fragments that required reassembly

Number of IP datagrams that were reassembled successfully

Number of IP datagrams for which reassembly failed

Number of IP datagrams that were fragmented successfully

Number of IP datagrams for which fragmentation failed an which were discarded

Number of created IP fragments

IP datagram: The IP header and IP data sections of a packet (See figure 7.1.)

IP fragment: Items that are divided into multiple IP datagrams when sending over 1500 bytes of

data.

Reassembly: Restoring data to its original form from fragmented IP datagrams

(4) MIB information: MIB_TCP .... TCP protocol information

Reads out 10 words of data using RAS information readout.

Table 7.5 MIB_TCP

Symbol

Description

MIB_TCP [0]

MIB_TCP [1]

MIB_TCP [2]

MIB_TCP [3]

MIB_TCP [4]

MIB_TCP [5]

MIB_TCP [6]

MIB_TCP [7]

MIB_TCP [8]

MIB_TCP [9]

The maximum of resent timeout (per ms)

Number of active open connections

Number of passive open connections

Number of times the connection open operation failed

Number of currently open connections

Number of segments received

Number of segments sent

Number of segments resent

Number of segments discarded due to format errors

Number of generated resets

Segment: The TCP header and TCP data block in an IP datagram (See figure 7.1.)

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(5) MIB information: MIB_UDP ... UDP protocol information

Reads out 4 words of data using RAS information readout.

Table 7.6 MIB_UDP

Symbol

Description

MIB_UDP [0]

MIB_UDP [1]

MIB_UDP [2]

MIB_UDP [3]

Number of UDP datagrams transferred upstream

Number of datagrams addressed to unused ports

Number of datagrams discarded due to format errors

Number of datagrams transferred from upstream

UDP datagrams: The UDP header and UDP data block in an IP datagram (See figure 7.1.)

(6) Event trace information

Record size:

16 bytes

160

Number of records:

Operation on overflow: Old information is updated. This means that it is always possible

to verify the 160 most recent event trace records.

Format:

Since this format is for Ethernet Port internal data, it is binary

codes. However, the time is expressed in BCD.

Event code

Detailed information 1

Detailed information 2

Detailed information 3

Detailed information 4

Month

Year

Day

Hour

Time information BCD

Seconds

Minute

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Event trace item:

See table 7.7

Table 7.7 Event Trace Items

Event Detail information 1 (H) Detail information 2 (H) Detail information 3 (H) Detail information 4 (H) Content

code

0001H ROM error (0160)

RAM error (0260)

Initialization error

DPRAM error (0360)

0002H Program address

Error code

NMI (0000)

Read port contents

None

Watchdog timer flag

NMI occurrence factor

TRAP (0001)

Watchdog timer check

(0002)

Watchdog timer check

(0003)

Watchdog timer flag

0004H Power on (0001)

Reset switch (0002)

Start type

Software reset (0003)

0005H Initialization (0000)

Control request (0001)

0007H Task ID

Request code

Station status

Write port contents

Mode prior to change

Memory pool number

Mode after change

Error code

Mode change

(station status)

Instruction storage

buffer allocation error

0008H Task ID

Station status

Error code

Transmission prohibit

0009H Receive response code

T2N driver reception or

response code error

0100H CMD number (0011)

CMD number (0012)

Station status

Write port contents

T2N-Ethernet Port

interface

completion error

UDP port (0001)

Station status (0002)

Mode prior to change

Task start number

MAC setting flag

socket (0001)

UDP port number

Station status

CMD number (0013)

Mode after change

Task completion status

IP setting flag

0200H Task ID

Error code

Message transmission

completion error

bind (0002)

sendto (0003)

length (0004)

Length

recvfrom (0005)

Error code

0300H Task ID

Request code

Socket transmission

completion error

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Preamble (7 bytes)

Signal used to synchronize reception

SFD (Start Frame Delimiter) (1 byte)

Remote port address (6 bytes)

Local port address (6 bytes)

Ethernet type (2 bytes)

0800H:IP, 0806H:ARP

IP header (20 bytes)

Packets

UDP header

(8 bytes)

TCP header

(20 bytes)

traveling on the

transmission

path

(72 to 1526

bytes)

UDP data field

(up to 1472 bytes)

IP datagram

(46 to 1500

bytes)

Data fields in

the packets

traveling on the

transmission

path

TCP data field

(up to 1460 bytes)

IP data field

(up to 1480

bytes)

FCS (Frame Check Sequence) (4 bytes)

32-bit CRC code for the sections of the packet

other than the preamble, the SFD, and the FCS.

(Packet error detection)

Figure 7.1 Packet Format/IP Datagram

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8. Error Handling

This chapter describes the error analysis and recovery procedures for errors that occur while using

the Ethernet Port. Also refer to the T2N user's manual when recovering from Ethernet Port-related

errors.

8.1 LED Display

The Ethernet Port indicates its Ethernet Port status in the ERUN, ET/R and EACC LEDs.

Table 8.1 lists the state indicated by the ERUN LED. Note that the Ethernet Port operating mode

can be determined by the combination of the ERUN and ET/R LED display states as listed in table

8.2. User programs should read out and verify the down information error codes listed in table 8.2

using the READ instruction issued for the down information in the T2N interface buffer. (See

section 7.2, Down Information.)

Ethernet Port that fail (go to the down state) should be replaced.

Table 8.1 States Indicated by the ERUN LED

LED display

State

ERUN (Run)

Indicates the Ethernet Port normal/error (down mode) status.

Lit............. Ethernet Port normal

Off............ Ethernet Port error (down)

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Table 8.2 Ethernet Port Down States Indicated by ERUN, ET/R LED Combinations

LED combination displayed

State

ERUN lit

Ethernet Port operating normally in standby mode (parameter setup wait state)

The Ethernet Port goes to this state after power is first applied and after a reset.

Ethernet Port operating normally in run mode (transmission possible)

The Ethernet Port switches to this mode in response to an operating mode control

request.

(Parameter setup is required to switch the Ethernet Port to run mode.)

An error occurred during operation and the Ethernet Port is down.

ERUN off,

ET/R (Ethernet transmission/

Possible causes of the Ethernet Port going down

Down information error code

receive) blinking

Watchdog timeout occurred

Memory bus stall occurred

Trap occurred

0010

0020

0030

Jabbering timeout occurred

Semaphore acquisition error

MBX reception error

0040

0500, 0501

0502, 0503

0504

MBX transmission error

No empty TCP resend queue

Acquired buffer was in use

Initial buffer acquisition error

0505

0506

0507

0508

Down mode due to the occurrence of an error during self diagnostics at power on.

Possible causes of the Ethernet Port going down

Down information error code

LAN controller check error

0050

0160

0260

0360

ROM BCC check found a discrepancy

System RAM area check error

T2N interface buffer check error

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The EACC LED indicates when the T2N is accessing the Ethernet Port.

Table 8.3 States Indicated by the EACC LED

LED display

State

EACC (Access) Indicates whether or not the T2N is accessing the Ethernet Port.

Lit ........ The T2N is accessing the Ethernet Port.

Off ....... The T2N is not accessing the Ethernet Port.

Lights after Ethernet Port initialization completes when power is first applied. (Access starts.)

If this LED does not light after power is turned on:

Verify that the T2N is correctly connected to the base unit.

If this LED does not light at above, then the T2N itself is defective. Replace the T2N.

Supplement:

We recommend keeping spares on hand to minimize the time required to determine the

location of the fault using and to minimize the time required for recovery.

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8.2 Status (error status)

The status indicates the status during SEND/RECV instruction execution or after execution

completes. If a SEND/RECV instruction does not complete normally, refer to the detailed

information (Ethernet Port error response) and the status and review the instruction word format at

the T2N and Ethernet Port states (operating modes).

The detailed information is stored in the register following the completion status when the

completion status TermSTS value indicates a transmission error (0BH).

Figure 8.1 shows the structure of the status information. Tables 8.4 and 8.5 list the TermSTS

values, and table 8.6 lists the contents of the detailed information.

The status (error status) has the following structure.

Status

B + 1

Detailed information

Sport NO

TermSTS

Only on an error 0: Error occurred at local station.

1: Error occurred at remote station.

Socket identifier: Only valid for socket interface transmission

instructions. ("0" for other instructions)

status 0: Initial state

1: While send requesting

2: Send complete and while

waiting response

busy 0: Initial state

1: Transmission port busy

abn 0: Normal complete

1: Error complete

3: Receive complete

Figure 8.1 Status Structure

Table 8.4 TermSTS (Part 1)

Meaning

TermSTS Status

00H

01H

Normal complete

•

Occurs if a register other than XW, YW, W, LW, RW, D, F, T, C, or SW is

specified as the data storage register in one of the following requests.

Requests: RAS information readout, remote port loopback, UDP send/receive,

TCP send/receive, register read/write.

In a register read or write request, the request specified a read or write from a

T register to a register other than a T register.

(This also applies to C registers.)

02H

Response timeout

• Occurs if a response is not received within the specified time for a remote port

loopback or register read/write request.

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Table 8.5 TermSTS (Part 2)

TermSTS Status

03H Parameter error

Meaning

• Occurs if a value other than 3 is specified for the module ID.

• Occurs if a value other than 1 is specified for the channel number.

• Occurs if a command number other than one of the following is specified for a

SEND instruction.

000FH, 0011H - 0014H, 0018H, 0021H, 0031H, 0032H, 0034H, 0035H,

0037H, 0039H

• Occurs if a command number other than one of the following is specified for a

RECV instruction.

0015H, 0021H, 0033H, 0038H

• Occurs if a value other than 1 to 8 is specified for the socket identifier.

(See section 6.4 "Using the Ethernet Port Socket Interface".)

• Occurs if an incorrect parameter is specified in a RAS information readout

request.

(See section 7.6 "RAS Information Readout".)

• Occurs if an attempt to write is made when the remote registers were write

protected.

04H

Memory write protect

• Occurs if an attempt to read is made when the local registers were write

protected.

05H

06H

(Reserved)

• Occurs if the Ethernet Port is down.

Module error

• Occurs if the Ethernet Port is initializing.

Initialization in progress

• Occurs if a T2N internal timer times out.

Requests: UDP open, UDP send, UDP close, TCP send, TCP close

Transmission complete

timeout

• Occurs if the corresponding Ethernet Port is not installed.

07H

08H

No send channel (CH)

• Occurs if the local port IP address was specified for the remote destination IP

address.

Port address out of range

Requests: Remote port loopback, register read/write

• Occurs if either 0 words or 486 or more words were specified for either a

09H

Incorrect transmission word

count

• Occurs if either 0 words or 1001 or more words were specified for a UDP/TCP

send/receive request.

• Occurs if the specified area (start address + register range) does not exist in

the T2N data storage registers.

Requests: RAS information readout, remote port loopback, UDP send/receive,

TCP send/receive, register read/write

0AH

0BH

Boundary error

Transmission error

• Occurs if the Ethernet Port returns an error response.

Detailed information (the Ethernet Port response status) is stored.

• Occurs if the T2N cannot access the Ethernet Port.

0CH

0DH

0EH

No I/O response

(Reserved)

• Occurs if a request is discarded when a T2N internal resource insufficiency

occurs due to increasing amounts of transfer data.

Send data capacity

exceeded

• Occurs if a T2N retransmission times out.

0FH

(Reserved)

When a transmission error (0BH) occurs, details of the Ethernet Port error response are stored in the

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Table 8.6 Detailed Information (Ethernet Port Error Responses)

Code

Error

Description

Normal complete

Local port fault

Local port standby

0001H Request completed normally

0002H The local port is in down mode

0003H Data transmission in standby mode (socket interface transmission or PC link

protocol transmission) was requested.

Timeout

0020H Timeout occurred during TCP open processing or receive processing, or during

UDP receive processing.

Length error

0030H Incorrect send data length

Port mode error

0040H One of the following requests was issued in a mode other than standby mode:

a. Parameter setup, b. MAC address setup, c. Reset

MAC/IP not set up

0050H

Occurs if the MAC address or IP address is not set up.

Transmission prohibited state

0060H • Occurs if a PC link request was issued from the T2N in run mode in the

message transmission prohibited state.

• Occurs if a socket open, close, send, or receive request is issued by the T2N

in run mode in the socket interface transmission prohibited state.

Format error

0070H Occurs when there is a format error in the request text.

0071H Port number error

0072H Request code error

0073H Time setting: Year

0074H Time setting: Month

0075H Time setting: Day

0076H Time setting: Hour

0077H Time setting: Minute

0078H Time setting: Second

Opened

0080H Occurs if an open request is issued for an already open socket.

0081H Occurs if send, receive, or close request is issued for an unopened socket.

0082H Occurs if the socket identifier is out of range (1 to 8).

Unopened

Incorrect socket identifier

Incorrect control request

specification

0083H Occurs if a request that was prohibited by an operating mode control request is

issued.

• Occurs if a run request is issued in run mode.

• Occurs if a standby request is issued in standby mode.

• Occurs if a run request and a standby request are issued at the same time.

LAN controller driver error

0090H Occurs if the setting of the local port IP address and port number in the area

reserved for transmission fails.

0091H Error in the TCP or UDP protocol (such as a transmission phase error)

0092H • Occurs if the setting of the remote port IP address in the remote port

information area (the NETDATA table) fails.

• Occurs if the remote port IP address network address differs from the local

port IP address network address.

Memory pool allocation failure

Port 2 task start failure

00A0H Occurs if the Ethernet Port internal OS fails to allocate memory.

00A1H Occurs if computer link or PC link socket identifier acquisition fails.

Broadcast specification error

00A2H Occurs if the remote IP address is broadcast on a remote port verification

request.

MAC address specification error 00B0H BCC error

00B1H

Occurs if an error occurs after address saving on a MAC setup request.

Insufficient resources error

00C0H Occurs if there are insufficient resources for UDP send or PC link transmission.

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8.3 T2N Special Relays and Registers

The Ethernet Port status information is reflected in the T2N special relays and special registers.

1. Special relays

Special relay

Name

Function

S000B

Ethernet Port error

(warning)

1: The installed Ethernet Port unit is down.

(The T2N continues to operate.)

0: Reset the system from a user program after resolving the

error in the down Ethernet Port.

2. Special registers

Special registers Name

SW063

CH1 station status

3. Station status format

DOWN

STBY

MTEN

TEST

INZ

RUN

STEN

Bit F: DOWN (down)...........................................1: Down mode, 0: Other than down mode

Bit E: INZ (initialization).....................................1: Initialization in progress

0: Initialization completed

Bit D: STBY (standby).........................................1: Standby mode

0: Other than standby mode

Bit C: RUN (run)..................................................1: Run mode, 0: Other than run mode

Bit 5: MTEN (Message transmission)..................1: Enabled, 0: Prohibited

Bit 4: STEN (socket interface transmission).........1: Enabled, 0: Prohibited

Bit 0: TEST (test).................................................1: Test function execution in progress

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8.4 Socket Interface Information

The information for the eight socket interface sockets held by the Ethernet Port can be read out

with the T2N READ instruction. (See Section 6.3 Socket Interface Information.) The Ethernet Port

holds five words of socket status information for each socket.

Remote port TCP/UDP port number

Remote port IP address

TCP/UDP port number for this socket

Socket status

Table 8.7 lists the structure of the socket interface information and the extended memory area

addresses.

Table 8.7 Socket Interface Information

Socket identifier

Remote port number (TCP only)

Remote port IP address (TCP only)

0F4BH 0F53H 0F5BH 0F63H 0F6BH 0F73H 0F7BH 0F83H

0F4CH 0F54H 0F5CH 0F64H 0F6CH 0F74H 0F7CH 0F84H

0F4DH 0F55H 0F5DH 0F65H 0F6DH 0F75H 0F7DH 0F85H

Local port TCP/UDP port number

Socket status

0F4EH 0F56H 0F5EH 0F66H 0F6EH 0F76H 0F7EH 0F86H

0F4FH 0F57H 0F5FH 0F67H 0F6FH 0F77H 0F7FH 0F87H

For UDP sockets, the remote port number and IP address data are invalid.

The socket status has the following structure.

TCP

AOPEN CONN RCLOSE

UDP POPEN RCV NOACK

Bit no. Bit

Condition under which the bit is set to 1

TCP used by the socket

Condition under which the bit is reset to 0

The socket closed in response to a close request

TCP

UDP

UDP used by the socket

AOPEN TCP socket in active open state

POPEN TCP socket in passive open state or UDP

socket in open state

CONN

TCP connection established

Disconnected by the local port with a close request

Disconnected by the remote port

No received text

RCV

Received text present

RCLOS An established TCP connection disconnected The socket closed in response to a close request

by the remote port

NOACK No response received from the remote port for The socket closed in response to a close request

a local port send operation in a state where a

TCP connection was established, and the TCP

resend function resulted in a timeout (because

the remote port was down, etc.).

If the wait time exceeds the set value during a When a TCP active open request is reissued.

TCP active open request.

This state does not occur for TCP passive

open requests.

A socket status in which neither AOPEN nor POPEN is set to 1 indicates that the socket is in the

closed state.

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8.5 Troubleshooting

1. If the Ethernet Port fails to come up normally (i.e., does not reach standby state.)

If the Ethernet Port is functional, then the Ethernet Port can be initialized and brought to the

standby state (with the ERUN LED lit) by applying power or by issuing a reset request.

START

Apply the rated line voltage to the primary side of

the power supply module.

Is power supplied to the T2N power

supply module?

Yes

Is the T2N correctly mounted in the

base unit?

Insert the PU235N/245N into its slot correctly.

Yes

Replace the PU235N/245N.

Read out the down information, and send both

that information and the PU235N/245N to

Toshiba.

2. If the Ethernet Port fails during operation

Recovery Replace the PU235N/245N.

procedure

Before replacing the PU235N/245N, read out the down information, and then send both that information

and the PU235N/245N to Toshiba.

3. If a SEND or RECV instruction fails complete

Recovery (1) Verify that the inputs of function block are held in the on state until the instruction completes.

procedure

(2) Determine whether the user program is writing to the status register while the instruction is executing.

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4. If the Ethernet Port fails to enter run mode

This section assumes that the Ethernet Port has come up normally up to this point. Note that the

parameters must be set up with a parameter setup request before issuing the operating mode

control request used to switch the Ethernet Port from standby mode to run mode.

a. Parameter setup request

START

Execute a parameter setup request that sets up

the IP address and the message transmission

UDP port number.

Is the parameter setup request

executed?

Yes

Verify the status using the procedure described in

the item 3 " If a SEND or RECV instruction fails

complete" on page 148.

Does the SEND instruction

complete?

Yes

Check the status and resolve the

error.

To the operating mode control request flowchart

END

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b. Operating mode control request

START

Set up correct specification information and issue

an operating mode control request.

Is an operating mode control

request executed?

Yes

Verify the status using the procedure described in

the item 3 " If a SEND or RECV instruction fails

complete" on page 148.

Does the SEND instruction

complete?

Yes

The Ethernet Port internal MAC address has

been corrupted.

Replace the PU235N/245N.

Have the parameters not been

set up yet?

Yes

Check the status and resolve the

error.

END

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5. If computer link protocol transmission fails

a. Host computer side (main port)

START

Is the transmission destination IP

Verify the slave Ethernet Port transmission

destination IP address.

address set to that of the slave

Ethernet Port?

Yes

Verify the slave Ethernet Port message

transmission UDP port number.

Supplement:

Is the transmission destination

message transmission UDP port

number correct?

Remember that there are separate send and

receive ports that each have their own

message transmission UDP port number.

Yes

Did the computer link protocol

return without errors?

Check the computer link protocol format.

Yes

1.Recheck the slave port IP address and

message transmission UDP port numbers.

Does a response come back if a

ping is issued to the slave Ethernet

Port?

2.Verify that there is no router on the network.

3.Check the network verification items.

Yes

Check the network verification

items, i.e., the items unrelated to

the Ethernet Port.

END

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b. Ethernet Port side (slave port)

START

Set the Ethernet Port to run + message

transmission enabled using an operating mode

control request.

Is the station status such that run +

message transmission is enabled?

Yes

1. Check the main port side IP address.

2. Verify that there is no router on the network.

3. Check the network verification items.

Does a response come back if a

ping is issued to the host

computer?

Yes

Is the error counter read out from

the RAS information constant (i.e.,

not being incremented)?

(Use RAS information readout to

determine this.)

It is possible that there is an abnormality on the

network itself. Check the network verification

items.

RAS error counters: Alignment error:

Short packet

Yes

CRC error

END

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6. If PC link protocol transmission fails

a. Main port side Ethernet Port

START

Verify the status using the procedure described in the

item 3 " If a SEND or RECV instruction fails complete"

on page 148.

Does the SEND/RECV instruction

complete?

Yes

Is the station status such that

run + message transmission is

enabled?

Was there a response timeout?

(TermSTS = 02H)

Yes

Set the Ethernet Port to run + message

transmission enabled using an

Check the status and

resolve the error.

operating mode control request.

Is the transmission destination IP

address set to that of the slave

Ethernet Port?

Verify the slave Ethernet Port transmission destination

IP address.

Yes

Verify the slave Ethernet Port message transmission

UDP port number.

Supplement:

Is the slave port message

transmission UDP port correct?

Remember that there are separate send and

receive ports that each have their own message

transmission UDP port number.

Yes

1. Recheck the slave port IP address and message

transmission UDP port numbers.

2. Verify that there is no router on the network.

3. Check the network verification items.

Does a response come back if a

ping is issued to the slave Ethernet

Port?

Yes

Is the error counter read out from

the RAS information constant (i.e.,

not being incremented)?

It is possible that there is an abnormality on the

network itself. Check the network verification items.

(Use RAS information readout to

determine this.)

RAS error counters: Alignment error:

Short packet

Yes

CRC error

END

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b. Ethernet Port side (slave port)

START

Set the Ethernet Port to run + message

transmission enabled using an operating mode

control request.

Is the station status such that run +

message transmission is enabled?

Yes

1. Check the main port side IP address.

2. Verify that there is no router on the network.

3. Check the network verification items.

Does a response come back if a

ping is issued to the main Ethernet

Port?

Yes

Is the error counter read out from

the RAS information constant (i.e.,

not being incremented)?

(Use RAS information readout to

determine this.)

It is possible that there is an abnormality on the

network itself. Check the network verification

items.

RAS error counters: Alignment error:

Short packet

Yes

CRC error

END

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7. If transmission using UDP sockets fails

a. Open and close requests

START

Verify the status using the procedure described in

the item 3 " If a SEND or RECV instruction fails

complete" on page 148.

Does the SEND instruction

complete?

Yes

Set the Ethernet Port to run + socket

transmission enabled using an operating mode

control request.

Is the station status such that run +

socket transmission is enabled?

Yes

Check the status and resolve the

error.

END

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b. Send request

START

Verify the status using the procedure described in

the item 3 " If a SEND or RECV instruction fails

complete" on page 148.

Does the SEND instruction

complete?

Yes

Set the Ethernet Port to run + socket

transmission enabled using an operating mode

control request.

Is the station status such that run +

socket transmission is enabled?

Yes

Is the transmission destination IP

address set to that of the remote

Ethernet Port?

Verify the remote Ethernet Port transmission

destination IP address.

Yes

Open UDP ports on the local port and remote

ports.

Are the UDP ports on the local and

remote ports opened?

Yes

Does the status indicate normal

completion?

Resolve the problem by referring to the status.

Yes

1. Recheck the remote port IP address and

message transmission UDP port numbers.

Does a response come back if a

ping is issued to the remote

Ethernet Port?

2. Verify that there is no router on the network.

3. Check the network verification items.

Yes

Is the error counter read out from

the RAS information constant (i.e.,

not being incremented)?

(Use RAS information readout to

determine this.)

It is possible that there is an abnormality on the

network itself. Check the network verification

items.

RAS error counters: Alignment error:

Short packet

Yes

CRC error

END

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c. Receive request

START

Verify the status using the

procedure described in the item

3 " If a SEND or RECV

instruction fails complete" on

page 148.

Did the RECV instruction

complete?

Was the wait time set to

unlimited?

Yes

Set the Ethernet Port to run +

socket transmission enabled

using an operating mode control

request.

Did the instruction time out?

TermSTS = 0BH

Is the station status such that

run + socket transmission is

enabled?

Details = 0020H

Yes

Open UDP ports on the local

port.

Is the local port open?

Yes

Resolve the problem by referring

to the status.

Is the remote port

transmitting?

Transmit a message at the

remote port.

Yes

Are the remote port IP

address and UDP port

number correct?

Verify the remote port IP address and UDP port

number.

Yes

1. Recheck the remote port IP address and

message transmission UDP port numbers.

2. Verify that there is no router on the network.

3. Check the network verification items.

Does a response come back

if a ping is issued to the

remote port?

Yes

Is the error counter read out

from the RAS information

constant (i.e., not being

incremented)?

(Use RAS information

readout to determine this.)

It is possible that there is an abnormality on the

network itself. Check the network verification

items.

RAS error counters: Alignment error

Short packet

Yes

CRC error

END

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8. If Transmission Using TCP Sockets Fails

When troubleshooting TCP sockets, also refer to the section "TCP socket interface notes" in

section 6.2, Ethernet Port Socket Interface Usage Notes.

a. Open request

START

Verify the status using the

procedure described in the

item 3 " If a SEND or RECV

instruction fails complete"

on page 148.

Did the SEND instruction

complete?

Was the wait time set to

unlimited?

Yes

Set the Ethernet Port to run

+ socket transmission

enabled using an operating

mode control request.

Did the instruction time out?

TermSTS = 0BH

Is the station status such that

run + socket transmission is

enabled?

Details = 0020H

Yes

Resolve the problem by referring

to the status.

Is the program attempting to

issue an active open to a

socket in the passive open

state?

Decide which role each socket will play when

establishing a connection between a pair of

sockets.

Yes

Are the remote port IP

address and TCP port

number correct?

Verify the remote port IP address and TCP port

number.

Yes

1. Recheck the remote port IP address and

message transmission TCP port numbers.

2. Verify that there is no router on the network.

3. Check the network verification items.

Does a response come back

if a ping is issued to the

remote port?

Yes

Is the error counter read out

from the RAS information

constant (i.e., not being

incremented)?

(Use RAS information

readout to determine this.)

It is possible that there is an abnormality on the

network itself. Check the network verification

items.

RAS error counters: Alignment error

Short packet

Yes

CRC error

END

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b. Close request

START

Verify the status using the procedure described in the

item 3 " If a SEND or RECV instruction fails

complete" on page 148.

Does the SEND instruction

complete?

Yes

Set the Ethernet Port to run + socket transmission

enabled using an operating mode control request.

Is the station status such

that run + socket

transmission is enabled?

Yes

Resolve the problem by

referring to the status.

END

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c. Send request

START

Verify the status using the procedure described in the

item 3 " If a SEND or RECV instruction fails complete"

on page 148.

Does the SEND instruction

complete?

Yes

Is the station status such that

run + socket transmission is

enabled?

Set the Ethernet Port to run + socket transmission

enabled using an operating mode control request.

Yes

Was a TCP connection

established?

Open UDP ports on the local and remote ports.

Yes

Is the socket status

RCLOSE bit?

Close the socket.

Status: Unopened (TermSTS = 0BH, details = 0081H)

Is the socket status

NOACK bit?

Close the socket.

Status: Protocol error (TermSTS = 0BH, details = 0091H)

Does the status indicate a

timeout error?

Check the status and resolve the error.

TermSTS = 0BH

Details = 0020H

Yes

Requests cannot be accepted due to network congestion.

® Redesign the user program.

Transmission becomes impossible when the receive side user program accumulates data.

® Check the receive side processing.

1. Recheck the remote port IP address and message

Does a response come back

transmission TCP port numbers.

2. Verify that there is no router on the network.

3. Check the network verification items.

if a ping is issued to the

remote port?

Yes

Is the error counter read out

from the RAS information

constant (i.e., not being

incremented)?

(Use RAS information

readout to determine this.)

It is possible that there is an abnormality on the

network itself. Check the network verification

items.

RAS error counters: Alignment error

Short packet

Yes

CRC error

END

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d. Receive request

START

Verify the status using the

procedure described in the

item 3 " If a SEND or RECV

instruction fails complete" on

page 148.

Did the RECV instruction

complete?

Was the wait time set to

unlimited?

Yes

Set the Ethernet Port to run

+ socket transmission

enabled using an operating

mode control request.

Did the instruction time out?

TermSTS = 0BH

Is the station status such that

run + socket transmission is

enabled?

Details = 0020H

Yes

Establish a connection with

the remote port.

Was a connection

established?

Yes

Resolve the problem by referring

to the status.

Is the remote port

transmitting?

Transmit a message at the

remote port.

Yes

1. Recheck the remote port IP address and

message transmission TCP port numbers.

2. Verify that there is no router on the network.

3. Check the network verification items.

Does a response come back

if a ping is issued to the

remote port?

Yes

Is the error counter read out

from the RAS information

constant (i.e., not being

incremented)?

(Use RAS information

readout to determine this.)

It is possible that there is an abnormality on the

network itself. Check the network verification

items.

RAS error counters: Alignment error

Short packet

Yes

CRC error

END

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9. Network check items (Ethernet Port)

Check items

Countermeasure

Transmission

medium

installation

10BASE-T

1. Is the twisted pair cable connected

between the Ethernet Port and HUB?

1. Verify the twisted pair cable connections between the

Ethernet Port and HUB.

2. How long (in meters) are the twisted pair

cable (i.e. segment lengths)?

2. The maximum segment length for 10BASE-T cabling is

100 meters.

Network cable 1. Do all ports on the network respond to ping 1. Inspect the twisted pair cables for missing termination

check

correctly?

resistors and damage.

2. Is the collision frequently happen?

Can you confirm the table indicating the

collision?

2. Since network loading is heavy:

•

Transmission efficiency can be degraded (TCP), and

There is an increased possibility of packet loss (UDP).

Therefore, the circuit usage conditions should be reviewed.

3. Are the error counters read out from the

RAS information increasing as time

passes?

3. Check whether there are any defective (or substandard)

connections on the cables and HUB.

Check for the presence of noise sources in the vicinity of

the network cables.

Error counters: Alignment error, Short

packet, CRC error

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9. Installation and Wiring

9.1 Installation Environment and Base Unit Mounting

The PU235N/245N must be used in the installation environment described in section 4.1,

"Installation Environment," of the T2N User's Manual - Hardware. Also, the PU235N/245N panel

must be installed in conformance with the notes and cautionary advice presented in section 4.1,

"Installation Environment."

CAUTION

1. Only use this equipment in the environment described in the T2N User's Manual - Hardware.

Use in any other environment can cause electrical shocks, fires, failures, and malfunctions.

2. Mount this equipment according to the mounting method specified in the T2N User's Manual -

Hardware.

Mounting in any direction other than the specified direction, or defective or inadequate mounting,

can result in the equipment falling, fires, failures, and malfunctions.

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9.2 Network Wiring

See section 3.2, "Network Wiring Equipment," for details on the equipment that makes up the

network. This section presents an outline of the wiring laid inside the control panel and outside the

control panel. This section also presents individual notes on the twisted pair cables used, the

coaxial cables, the AUI cables, and the MAUs.

Basic points in laying out a network

CAUTION

1. When laying network cable, take adequate safety measures and perform all operations in

accordance with the relevant standards. See the ISO/IEC8802-3 standard for details on laying

networks.

2. We strongly recommend hiring a qualified contractor who has specialized knowledge about safety

precautions and standards.

3. Avoid installing 10BASE5, 10BASE2 or 10BASE-T networks in environments that have high noise

levels. If this is unavoidable, adopt the noise prevention measure described below.

1. Overview of wiring outside the control panel

a. Layout environment and required work

Lay out cables in a manner appropriate for the environment. The steps listed in the following table

are generally required.

Table 9.1 Wiring Environment and Work Operations

Environment in which cable is laid

Work operations

Major categories

Minor categories

Locations where cables will

not be damaged

Installation without protective pipes

Installation with protective pipes

Location where cables could Places where there is normally motion

be damaged

of people and objects

Places where cables may be influenced Installation with protective metal pipes

by humidity, chemicals, oils, or heat

Places where cables may be damaged Installation with protective pipes

by rats, mice, or other animals.

Places where cables may receive

strong mechanical shocks, or where

heavy physical loads may be placed on

the cables.

Installation with protective metal pipes

Locations where there is a

likelihood of electromagnetic

interference

Protective installation and separation

of cables.

Installation with protective metal pipes

The term "installation with protective pipes" means that either metal or PVC pipes may be used.

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b. Overview of wiring without protective pipes

(1) To protect the cables, cables should be passed through flooring ducts or wire protecting cable

covers should be used.

Note that these cables should not be laid adjacent to cables carrying high currents.

(2) Lay cables in gaps in the walls so that they will not be damaged, and run cables under the

flooring under equipment so that electromagnetic interference will not occur.

(3) Observe the applicable cable separation standards when running cables in parallel with, when

crossing, or when approaching low-voltage indoor power lines.

(4) Fasten cables every 3 meters so that the cables are not damaged when attaching cables to

walls to position the away from the floor, or when running cables vertically.

(5) When bending cables, be sure that the radius of curvature of the bend does not exceed the

bending limit for the cable used.

c. Notes on piped cabling

(1) Do not run coaxial cable and lines carrying high currents in the same pipe.

(2) When bending pipes, do not bend pipes to an angle sharper than 90 degrees.

(3) When bending pipes, the radius of curvature must be at least 6 times the internal diameter of

the pipe, and must be no smaller than the minimum radius of curvature for bending of the

enclosed cables.

(4) Ground metal pipes.

d. Separation from other wiring

As a general principle, coaxial cable should be separated by at least 2 meters from power lines and

equipment that generates electric or magnetic fields. If it is difficult to achieve a separation of 2

meters, look up the actual voltage and current of the induction source in the table below to

determine the separation distance. However, since transmitted signals are weak signals, restrict

induction sources to no more than 440 volts and 100 amperes.

Table 9.2 Recommended Minimum Separation Distance

Induction source Minimum separation for parallel lines (mm)

Voltage, current

Over 440 V

Up to 440 V

Up to 220 V

Up to 110 V

Up to 60 V

Over 100 A Up to 100 A Up to 50 A Up to 10 A

2000

600

500

2000

600

500

300

2000

600

500

300

150

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Considering resistance to noise, we recommend using either covered metal cable ducts or

protective steel pipe. Table 9.3 lists the recommended minimum separations for parallel lines in

this case.

Table 9.3 Recommended Minimum Separation Distance

(Covered metal ducts and metal pipe) (Units: mm)

Cable installation method

Parallel separation

Covered metal ducts or metal pipe

Up to Up to Up to

Up to

501 meters

10 meters 25 meters 100 meters 200 meters 500 meters or over

Power Up to 125 V, up to 10 A

150

200

250

100

200

250

200

250

cable

Up to 250 V, up to 50 A

Up to 400 V, up to 100 A

Up to 500 V, up to 200 A

100

200

100

Levels exceeding the above At least 500

When using cable ducts, install steel separators to separate power cables from coaxial cables as

shown in the figure below.

Metal duct

Separator

Power cable

Instrumentation power lines

Coaxial cable

Solenoid and other control signals

Figure 9.1 Duct Internal Layout Example

When laying cables in a pit, use separators in the same manner as when ducts are used.

Separator (steel)

Signal lines

Power source

Ground

(with a resistance to ground of 100W or less)

Figure 9.2 Pit Internal Layout Example

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e. Wiring routes

The desirable routes for laying the transmission cable can be ordered as follows.

(1) Using a dedicated route

(2) Using a route dedicated to computer system related lines

(3) Using a route dedicated to general measurement equipment

(4) Using a route dedicated to plant control related lines

2. Overview of panel internal wiring

When 10BASE-T is used with the Ethernet Port, twisted pair cable is connected to the Ethernet

Port. Keep the following points in mind when wiring inside the control panel.

a. Wiring path

Use the weak-signal route within the panel for wiring the coaxial cable.

In particular, keep the coaxial cable at least 50 cm away from power supply cables.

b. Securing coaxial cable

Secure the coaxial cable with clamp materials so that the weight of the cable is not applied to the

cable's connectors.

Remember that the cable not must be bent beyond its minimum bending radius.

3. Notes on laying and wiring twisted pair cable (10BASE-T)

a. Only use this twisted pair cable in boards. Consult with a specialist contractor if twisted pair

cable must be routed out of boards.

4. Notes on laying and wiring 10BASE2 and 10BASE5 coaxial cable

a. Only use this coaxial cable indoors. Consult with a specialist contractor if coaxial cable must

be routed outdoors.

b. Connect terminators to both ends of the coaxial cable.

c. Insulate all exposed metal parts other than the coaxial cable installation point from ground

and other metal parts.

10BASE5: Plugs, adapters, terminators

10BASE2: BNC plugs, adapters, terminators, T connectors.

d. For safety, ground, at a single point, the coaxial cable's external conductor to a point with a

resistance to ground of 100 W or less.

Also, prepare a dedicated network system ground that is not shared with other equipment.

e. Contact the manufacturer of the cable with regard to the physical characteristics value of the

coaxial cable allowable minimum bending radius.

f. Avoid locations with high temperature, high humidity, dust, or oil mist when installing coaxial

cable.

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5. Notes on laying and wiring AUI cable

a. When connecting the AUI cable to the MAU connectors, use the slide latches to secure the

connectors firmly.

b. Contact the manufacturer of the cable with regard to the physical characteristics value of the

AUI cable allowable minimum bending radius.

c. Avoid locations with high temperature, high humidity, dust, or oil mist when installing AUI

cable.

6. Notes on MAU (10BASE5) installation

a. Attach MAUs at the 2.5-meter separated marks on the coaxial cable.

b. Since the procedure for attaching MAUs to coaxial cable differs between manufacturer, refer

to the MAU user's manual.

c. Since the coaxial cable is grounded, the MAU main unit should be mounted insulated from

ground.

d. Do not install MAUs in the vicinity of equipment that generates electrical noise. If a MAU

must be installed in such a location, provide a MAU enclosure box, and mount the MAU

inside the box insulated from that box. Be sure to ground the MAU enclosure box.

e. Avoid locations with high temperature, high humidity, dust, or oil mist when installing MAU

cable.

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Appendix 1 Maintenance and Inspection

Periodic Inspection

Check the following items periodically, once every six months. Also, check these points if any

surrounding conditions or any aspect of the environmental changes.

Table A.1 Periodic Inspection Items

Inspection item

Inspection

Criterion

Resolution procedure

Power supply systems

Measure the power-supply

Voltages must be within the Adjust the input voltages to be

(T2N power supply/MAU voltage at the power-supply

stipulated ranges.

within the stipulated ranges.

power supply)

terminals.

Check for loose screws at the There must be no

Turn off (remove power from)

the power supply and tighten

down the screws with a

screwdriver.

power-supply terminals.

looseness.

Check for damage to the

power-supply cables.

There must be no damage. Turn off (remove power from)

the power supply and replace

the damaged cables.

Installation state

Is the module firmly locked in

place?

There must be no

looseness or play.

First press the module.

Transmission cable

connections

10BASE5: Are the AUI cables There must be no

First press the cable firmly into

the connector and then slide

the slide latch to the locked

position.

firmly locked in place?

looseness or play.

The 10BASE5 connector

slide latches must be in

their locked positions.

10BASE2: Are the coaxial

cables firmly locked in place?

There must be no

looseness or play.

First press the T-connector

firmly into position and then

engage the T-connector lock.

The T-connector locks

must be engaged.

10BASE-T: Are the twisted pair There must be no

First press the twisted pair

cables firmly locked in place?

looseness or play.

cable into modular connector.

The modular connector

locks must be engaged.

Transmission cable wiring 10BASE5/2/-T: Check for

There must be no damage. Stop the system, turn off

(remove power from) the power

supply and replace the

(See section 9.4,

"Network Wiring".)

damage to the cables.

damaged cables.

Are the cables installed near

any power or other cables?

There must be no power or Separate the cables from the

other similar cables in the power lines.

vicinity.

Shield the cables.

Ambient conditions

Verify that temperature,

humidity, vibration, and dust

levels are all within the

stipulated ranges.

The values must be within Improve the environment so

the ranges from the

general specifications for

the module.

that all aspects are within the

ranges stipulated in the

specifications.

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CAUTION

1. Always turn off the power before attaching or removing modules, the terminal block, or cables.

Electrical shock, malfunctions, and breakdowns are possible if these operations are performed with

the power on.

2. To keep the system operating normally at all times and to prevent trouble in advance, perform daily

inspections, periodic inspections, and cleaning.

3. Refer to the section on error recovery in this document if the Ethernet Port does not operate

correctly.

Contact your local Toshiba dealer or service representative if a breakdown occurs, and request that

the module be repaired or returned to Toshiba.

Operation and safety cannot be guaranteed if service is performed by anyone other than an

authorized Toshiba service representative.

4. Do not disassemble or modify the module hardware, and do not modify the module software.

Breakdowns or malfunctions may lead to fire, electrical shock, or injury.

5. When measuring the voltages at the module terminal block during inspections, use adequate

caution.

There is a danger of electrical shock during this operation.

6. Only exchange modules with the power completely off.

Exchanging modules with the power on can lead to malfunctions, breakdowns, and electrical shock.

7. Do not continue to use the module if it emits smoke or unusual odors, or if it is in an abnormal state

of any type.

Using the module in an abnormal state can lead to malfunctions, breakdowns, and electrical shock.

In such cases, immediately turn of all power and contact your local Toshiba dealer or service

representative.

Customers should never attempt repairs or modifications to this equipment themselves: repair and

modification operations are extremely dangerous.

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Appendix 2 Request Code Table

This table lists the request codes (CMD) used with SEND/RECV instructions sent to the Ethernet

Port. Refer to the section/item indicated in the reference column in the table for detailed

explanations of the request codes.

Table A.2 Instructions (Requests) to the Ethernet Port

Request

Function

Instruction CMD/Class Reference

Reset request

Resets the Ethernet Port.

SEND

0011H/(1)

0012H/(1)

0013H/(1)

Section 4.3

Section 4.4

Section 4.5

Parameter setup request Sets up the Ethernet Port parameters.

Operating mode control

request

Sets the operating mode.

Remote port verification Verifies the existence of another port on the

request network.

SEND

RECV

SEND

0014H/(1)

0015H/(1)

0018H/(1)

0021H/(2)

000FH/(2)

Section 7.3

Section 7.6

Section 7.5

Section 5.4

Section 5.3

Section 7.4

RAS information readout Reads out the Ethernet Port RAS information.

request

Time set request

Sets the Ethernet Port internal clock

Time information for event trace

(PC link function)

Reads register data from remote T2N into registers RECV

in the local T2N.

(PC link function)

Writes register data from the local T2N to registers SEND

in remote T2N.

Remote port loopback

request

Performs a loopback test with another Ethernet

Port on the network.

SEND

UDP open request

UDP send request

UDP receive request

UDP close request

TCP open request

TCP send request

TCP receive request

TCP close request

Opens a UDP socket.

SEND

RECV

SEND

RECV

SEND

0031H/(3)

0032H/(3)

0033H/(3)

0034H/(3)

0035H/(3)

0037H/(3)

0038H/(3)

0039H/(3)

Section 6.4 (1)

Section 6.4 (2)

Section 6.4 (3)

Section 6.4 (4)

Section 6.4 (5)

Section 6.4 (6)

Section 6.4 (7)

Section 6.4 (8)

Transmits data from an open UDP socket.

Reads out data received by an open UDP socket.

Closes (terminates) an open UDP socket.

Opens a TCP socket.

Transmits data from an open TCP socket.

Reads out data received by an open TCP socket.

Closes (terminates) an open TCP socket.

The request code (CMD) types (1) to (3) have the following meanings.

Class (1) is module control, (2) is PC link protocol transmission, and (3) is socket interface

transmission.

For a single Ethernet Port, it is not possible to request another class (1) CMD while a class

(1) CMD is executing. This is also true for class (2) CMDs. If such a request is issued, the

status will be transmission port busy, and the request will go to the wait state.

For a single Ethernet Port, when requesting a class (3) CMD, it is not possible to request

another class (3) command for a socket for which an instruction is executing. If such a request

is issued, the status will be transmission port busy, and the request will go to the wait state.

There are eight sockets, and each can independently accept and execute a class (3) instruction.

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Appendix 3 Status Table

Figure a.1 lists the completion status and detailed information stored in the specified registers

during SEND/RECV instruction execution or at instruction completion. Tables A.3 and A.4 list

the contents of the TermSTS completion status, and table A.5 lists the contents of the detailed

information (the Ethernet Port error response) loaded into the next register after the register used

for the completion status.

Sport NO

TermSTS

Only on an error 0: Error occurred at local port.

1: Error occurred at remote port.

Socket identifier:Only valid for socket interface transmission

instructions. ("0" for other instructions)

status 0: Initial state

busy 0: Initial state

1: Transmission port busy

1: While send requesting

2: Send complete and while

waiting response

abn 0: Normal complete

1: Error complete

3: Complete

Figure A.1 Status Structure

Table A.3 TermSTS (Part 1)

Meaning

TermSTS Status

00H

01H

Normal complete

•

Occurs if a register other than XW, YW,W, LW, RW, D, F, T, C, or SW is

specified as the data storage register in one of the following requests.

Requests: RAS information readout, remote port loopback, UDP send/receive,

TCP send/receive, register read/write.

•

In a register read or write request, the request specified a read or write from a

T register to a register other than a T register.

(This also applies to C registers.)

02H

03H

Response timeout

Parameter error

Occurs if a response is not received within the specified time for a remote port

loopback or register read/write request.

•

Occurs if a value other than 3 is specified for the module ID.

Occurs if a value other than 1, 2, 3, or 4 is specified for the channel number.

Occurs if a command number other than one of the following is specified for a

SEND instruction.

000FH, 0011H - 0014H, 0018H, 0021H, 0031H, 0032H, 0034H, 0035H,

0037H, 0039H

•

Occurs if a command number other than one of the following is specified for a

RECV instruction.

0015H, 0021H, 0033H, 0038H

•

Occurs if a value other than 1 to 8 is specified for the socket identifier.

(See section 6.4 "Using the Ethernet Port Socket Interface".)

Occurs if an incorrect parameter is specified in a RAS information readout

request.

(See section 7.6 "RAS Information Readout ".)

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Table A.4 TermSTS (Part 2)

Meaning

TermSTS Status

04H

Memory write protect

•

Occurs if an attempt to write is made when the remote registers were write

protected.

•

Occurs if an attempt to read is made when the local registers were write

protected.

05H

06H

(Reserved)

Module error

•

Occurs if the Ethernet Port is down.

Initialization in progress

•

Occurs if the Ethernet Port is initializing.

Transmission complete

timeout

Occurs if a T2N internal timer times out.

Requests: UDP open, UDP send, UDP close, TCP send, TCP close

07H

08H

No send channel (CH)

•

Occurs if the corresponding Ethernet Port is not installed.

Port address out of range

Occurs if the local port IP address was specified for the remote destination IP

address.

Requests: Remote port loopback, register read/write

09H

0AH

Incorrect transmission word

count

•

Occurs if either 0 words or 486 or more words were specified for either a

Occurs if either 0 words or 1001 or more words were specified for a UDC/TCP

send/receive request.

Boundary error

•

Occurs if the specified area (start address + register range) does not exist in

the T2N data storage registers.

Requests: RAS information readout, remote port loopback, UDP send/receive,

TCP send/receive, register read/write

0BH

0CH

Transmission error

•

Occurs if the Ethernet Port returns an error response.

Detailed information (the Ethernet Port response status) is stored at B+1.

No I/O response

(Reserved)

Occurs if the T2N cannot access the Ethernet Port.

0DH

0EH

Send data capacity

exceeded

•

Occurs if a request is discarded when a T2N internal resource insufficiency

occurs due to increasing amounts of transfer data.

Occurs if a T2N retransmission times out.

0FH

(Reserved)

Details on the Ethernet Port error response when a transmission error (0Bh) occurs are stored in

the register following the status. (See table A5.)

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Table A.5 Detailed Information (Ethernet Port Error Responses)

Code

Error

Description

Normal complete

Local port fault

Local port standby

0001H Request completed normally

0002H The local port is in down mode

0003H Data transmission in standby mode (socket interface transmission or PC link

protocol transmission) was requested.

Timeout

0020H Timeout occurred during TCP open processing or receive processing, or during

UDP receive processing.

Length error

0030H Incorrect send data length

Port mode error

0040H One of the following requests was issued in a mode other than standby mode:

a. Parameter setup, b. MAC address setup, c. Reset

MAC/IP not set up

0050H

Occurs if the MAC address or IP address is not set up.

Transmission prohibited state

0060H • Occurs if a PC link request was issued from the T2N in run mode in the

message transmission prohibited state.

• Occurs if a socket open, close, send, or receive request is issued by the T2N

in run mode in the socket interface transmission prohibited state.

Format error

0070H Occurs when there is a format error in the request text.

0071H Port number error

0072H Request code error

0073H Time setting: Year

0074H Time setting: Month

0075H Time setting: Day

0076H Time setting: Hour

0077H Time setting: Minute

0078H Time setting: Second

Opened

0080H Occurs if an open request is issued for an already open socket.

0081H Occurs if send, receive, or close request is issued for an unopened socket.

0082H Occurs if the socket identifier is out of range (1 to 8).

Unopened

Incorrect socket identifier

Incorrect control request

specification

0083H Occurs if a request that was prohibited by an operating mode control request is

issued.

• Occurs if a run request is issued in run mode.

• Occurs if a standby request is issued in standby mode.

• Occurs if a run request and a standby request are issued at the same time.

LAN controller driver error

0090H Occurs if the setting of the local port IP address and port number in the area

reserved for transmission fails.

0091H Error in the TCP or UDP protocol (such as a transmission phase error)

0092H • Occurs if the setting of the remote port IP address in the remote port

information area (the NETDATA table) fails.

• Occurs if the remote port IP address network address differs from the local

port IP address network address.

Memory pool allocation failure

Port 2 task start failure

00A0H Occurs if the Ethernet Port internal OS fails to allocate memory.

00A1H Occurs if computer link or PC link socket identifier acquisition fails.

Broadcast specification error

00A2H If the remote destination was specified to be broadcast in a remote port

verification request.

MAC address specification error 00B0H BCC error

00B1H

Occurs if an error occurs after address saving on a MAC setup request.

Insufficient resources error

00C0H Occurs if there are insufficient resources for UDP send or PC link transmission.

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Appendix 4 Limitations on the T2N SEND and RECV Instructions

When transmissions using the Ethernet Port occur with high frequency, the T2N internal

processing load increases and it is possible for this to interfere with the T2N periodic interrupts

and other internal operations. For example, the T2N processing load increase greatly when

requests from other ports and requests from the local port occur at the same time in a single

Ethernet Port. Therefore, the Ethernet Port must be used with the following limitations enforced.

Usage Recommendations

When using the SEND and RECV instructions, there are limitations on the interrupt periods that can be

set the fixed period interrupt programs.

(1) When using the PC link protocol with the Ethernet Port

The number of words that can be set for the SEND and RECV instructions is stipulated to be

either:

The number of words that the local port transmitted with the SEND instruction.

or:

The number of words that the local T2N transmitted in response to a data request issued

with the RECV instruction from a remote T2N.

When some number of words are transmitted by the local T2N with the SEND instruction and

some other number of words are transmitted due to a RECV instruction request from a remote, we

focus on the larger of the two word counts when transmission is through the same transmission

Ethernet Port.

T2N PU235N/

245N

In the figure to the left, the number of words

CH1

transmitted in CH1 is:

nr if ns < nr, and

ns if ns > nr.

Receive request due to a remote T2N RECV instruction

Response transmission for the RECV instruction (word count: nr)

Transmission path

Transmission to a remote T2N due to a T2N SEND instruction (word count: ns)

Figure A.2 Word Counts Considered with the PC Link Protocol

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Table A.6 Number of Words that can be Transmitted Using PC Link Protocol with the Ethernet

Port

[When TCP/UDP socket transmission is not used]

Module classification

Processing time for function

instructions

Maximum specifiable number of transmission

words for local T2N SEND instructions or remote

T2N RECV instructions

PU235N

PU245N

4 ms (maximum)

5 ms (maximum)

3 ms (maximum)

4 ms (maximum)

5 ms (maximum)

485 words (maximum)

295 words (maximum)

485 words (maximum)

346 words (maximum)

131 words (maximum)

Conditions for the above table:

a. For the T2N configuration, this table assumes the configuration of figure A.3, in which T2N

(PU235N/245N) is mounted in the main base unit.

b. Refer to the T2N User's Manual - Hardware for the processing times for the instructions.

c. This table assumes that for PU245N, 128 words is specified for S20LP PC link protocol

transmission (SEND instruction on local port or RECV instruction from remote ports).

However, if S20LP PC link protocol transmission is not used, use the PU235N row in the

above table, even if there are PU245N unit installed.

d. If less than 128 words are used with the S20LP PC link protocol transmission, the number of

words that can be specified during PC link transmission on the Ethernet Port can be increased

over the values listed in table a.6. If the number of words for S20LP PC link protocol

transmission on the PU245N decreased on one word, the number of words for PC link

protocol transmission on the Ethernet Port can increase in one word. However, the maximum

number of words that can be specified during PC link transmission on the Ethernet Port is 485

words.

With the computer link and

loader not connected

T2N

(PU235N/

245N)

(main base unit)

Figure A.3 T2N Configuration when Using the PC Link Protocol

[Example] In case of the transmission with 1024 words in the TMOV instruction is executed.

Execution time required = 206 + 3.5 * n (the number of transmission words : 1024)

= 3790

In this case, the execution time required is under 4ms. Therefore, the maximum specifiable number

of transmission words are 485 words for PU235N, 346 words for PU245N.

[Attention] In case of using the instruction below, be careful to use the maximum specifiable

number of transmission. In the case of using another instruction, be careful, too.

TMOV,TNOT,TCMP,XFER,READ,WRITE

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(2) When using socket transmission (TCP or UDP) with the Ethernet Port

Table A.7 Number of Words that can be Transmitted Using TCP/UDP

Socket Transmission with the Ethernet Port

[When the PC link protocol is not used]

Module classification

Processing time for function instructions

Maximum number of words that can be specified in

socket transmission.

PU235N

PU245N

1 ms (maximum)

2 ms (maximum)

3 ms (maximum)

4 ms (maximum)

5 ms (maximum)

1 ms (maximum)

2 ms (maximum)

3 ms (maximum)

4 ms (maximum)

5 ms (maximum)

1000 words (maximum)

927 words (maximum)

712 words (maximum)

497 words (maximum)

282 words (maximum)

978 words (maximum)

763 words (maximum)

548 words (maximum)

333 words (maximum)

118 words (maximum)

Conditions for the above table:

a. For the T2N configuration, this table assumes the configuration of figure A.4, in which T2N

(PU235N/245N) is mounted in the main base unit.

b. Refer to the T2N User's Manual - Hardware for the processing times for the instructions.

c. This table assumes that for PU245N, 128 words is specified for S20LP PC link protocol

transmission (SEND instruction on local port or RECV instruction from remote ports).

However, if S20LP PC link protocol transmission is not used, use the PU235N row in the

above table, even if there are PU245N unit installed.

d. If less than 128 words are used with the S20LP PC link protocol transmission, the number of

words that can be specified during socket transmission on the Ethernet Port can be increased

over the values listed in table A.7. If the number of words for S20LP PC link protocol

transmission on the PU245N decreased on one word, the number of words for Socket

transmission on the Ethernet Port can increase in one word. However, the maximum number

of words that can be specified during PC link transmission on the Ethernet Port is 1000

words.

With the computer link and

loader not connected

T2N

(PU235N/

245N)

(main base unit)

Figure A.4 T2N Configuration when Using the Socket Interface

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(3) When using the PC link protocol and socket transmission (TCP or UDP) with the Ethernet

Port.

Table A.8

Number of Words that can be Transmitted Using PC Link Protocol and

TCP/UDP Socket Transmission with the Ethernet Port with Ethernet

Port.

[When PC link transmission and TCP/UDP socket transmission is used either]

Module classification

Processing time for function

instructions

Maximum specifiable number of transmission words

for local T2N SEND instructions, remote T2N RECV

instructions or socket transmission

PU235N

1 ms (maximum)

2 ms (maximum)

3 ms (maximum)

4 ms (maximum)

5 ms (maximum)

1 ms (maximum)

2 ms (maximum)

3 ms (maximum)

4 ms (maximum)

5 ms (maximum)

1073 words (maximum)

858 words (maximum)

643 words (maximum)

428 words (maximum)

213 words (maximum)

1038 words (maximum)

823 words (maximum)

607 words (maximum)

392 words (maximum)

177 words (maximum)

PU245N

Conditions for the above table:

a. For the T2N configuration, this table assumes the configuration of figure A.5, in which T2N

(PU235N/245N) is mounted in the main base unit.

b. Refer to the T2N User's Manual - Hardware for the processing times for the instructions.

c. This table assumes that for PU245N, 128 words is specified for S20LP PC link protocol

transmission (SEND instruction on local port or RECV instruction from remote ports).

However, if S20LP PC link protocol transmission is not used, use the PU235N row in the

above table, even if there are PU245N unit installed.

d. The number of words is the maximum number words that can be specified during PC link

transmission and socket transmission. The maximum number of words that can be specified

during PC link transmission on Ethernet Port is 485 words, and during socket transmission on

Ethernet Port is 1000 words.

e. If less than 128 words are used with the S20LP PC link protocol transmission, the number of

words that can be specified during PC link transmission on the Ethernet Port can be increased

over the values listed in table A.8. If the number of words for S20LP PC link protocol

transmission on the PU245N decreased on one word, the number of words for PC link

protocol transmission or Socket transmission on the Ethernet Port can increase in one word.

However, the maximum number of words that can be specified during PC link transmission on

the Ethernet Port is 485 words, and during socket transmission on the Ethernet Port is 1000

words.

f. If the PU245N is used only Ethernet or S20LP PC link transmission, refer to the value listed

in table A.6 and if the PU245N is used only socket transmission on the Ethernet Port, refer to

the value listed table A.7.

With the computer link and

loader not connected

T2N

(PU235N/

245N)

(main base unit)

Figure A.5 T2N Configuration when Using the PC Link Protocol

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