Omron Network Card C200H LK401 User Manual

Cat.No. W135–E1–3

SYSMAC

C200H-LK401/C500-LK009-V1

PC Link

SYSTEM MANUAL

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PC Link

System Manual

Revised March 2000

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Notice:

OMRON products are manufactured for use according to proper procedures by a qualified operator

and only for the purposes described in this manual.

The following conventions are used to indicate and classify precautions in this manual. Always heed

the information provided with them. Failure to heed precautions can result in injury to people or dam-

age to property.

DANGER

Indicates an imminently hazardous situation which, if not avoided, will result in death or

serious injury.

WARNING

Caution

Indicates a potentially hazardous situation which, if not avoided, could result in death or

serious injury.

Indicates a potentially hazardous situation which, if not avoided, may result in minor or

moderate injury, or property damage.

OMRON Product References

All OMRON products are capitalized in this manual. The word “Unit” is also capitalized when it refers

to an OMRON product, regardless of whether or not it appears in the proper name of the product.

The abbreviation “Ch,” which appears in some displays and on some OMRON products, often means

“word” and is abbreviated “Wd” in documentation in this sense.

The abbreviation “PC” means Programmable Controller and is not used as an abbreviation for any-

thing else.

Visual Aids

The following headings appear in the left column of the manual to help you locate different types of

information.

Note Indicates information of particular interest for efficient and convenient operation

of the product.

1, 2, 3... 1. Indicates lists of one sort or another, such as procedures, checklists, etc.

OMRON, 1990

form, or by any means, mechanical, electronic, photocopying, recording, or otherwise, without the prior written permis-

sion of OMRON.

No patent liability is assumed with respect to the use of the information contained herein. Moreover, because OMRON is

constantly striving to improve its high-quality products, the information contained in this manual is subject to change

without notice. Every precaution has been taken in the preparation of this manual. Nevertheless, OMRON assumes no

responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of the informa-

tion contained in this publication.

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TABLE OF CONTENTS

PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Application Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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SECTION 1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1 PC Link Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-2 Operating Levels and Polling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 2

System Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1 System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-2 Using Link Adaptors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 3

Data Exchange and Operations . . . . . . . . . . . . . . . . . . . .

3-1 LR Area Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2 LR Area Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3 LR Area Division Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-4 Data Exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 4

Unit Components and Switch Settings . . . . . . . . . . . . . . .

4-1 C200H PC Link Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2 C500 PC Link Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3 Switch Setting Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 5

System Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1 Mounting and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 6

Programming Considerations . . . . . . . . . . . . . . . . . . . . . .

6-1 Response Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-2 Reducing Response Time (C200H, C200HS, C200HX/HG/HE(–Z)) . . . . . . . . . . . . . . . .

6-3 Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 7

Error Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7-1 SR Area Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7-2 Error Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7-3 Error Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 8

Inspection and Maintenance . . . . . . . . . . . . . . . . . . . . . . .

Appendix

A Standard Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vii

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About this Manual:

A PC Link System enables use of the LR (Link Relay) data area as a common data area shared by all PCs

in the PC Link System, thus simplifying programming, settings, and data exchange between PCs and per-

mitting effective use of inputs and outputs.

This manual has been written to provide the information necessary to design and install a single-level or

multilevel PC Link System using PC Link Units with C500, C500F, C1000H, C2000, C2000H, C200H,

C200HS, and/or C200HX/HG/HE(-Z) PCs. Before attempting to design, install, or operate a PC Link Sys-

tem, be sure to thoroughly familiarize yourself with the information contained herein. During operation,

refer to the relevant PC Programming Manuals for programming and control system details.

Section 1 introduces PC Link Systems and describes their advantages and characteristics. It also

describes the improvements made in the most recent version.

Section 2 describes the elements that go together to construct a PC Link System and the factors re-

quired to design a System.

Section 3 describes the LR area used in data transfer between the PCs, the method used to allocate

it to the PCs, and the polling process used to actually transfer data.

Section 4 provides details on PC Link Units, the main Units used to build PC Link Systems. Parts of

the Units, switch setting, and examples of switch settings are provided.

Section 5 provides details on mounting and wiring PC Link Units and provides Unit dimensions.

Section 6 offers details and examples of programming PCs to utilize PC Link Systems effectively.

Section 7 describes error indications and error processing. Both indicator lights and dedicated error-

related flags are provided.

Section 8 describes basic maintenance and hardware troubleshooting procedures.

Appendix A provides basic specifications and complete model numbers for OMRON products used

in PC Link Systems.

Appendix B provides general specifications for PC Link Units and PC Link Systems.

This manual is intended to be used in conjunction with the PC Operation Manual and/or Installation

Guides for the PCs in the System. In most Systems, the Link Adaptor Operation Guide will also be

required. The application of Link Adaptors to PC Link Systems is also described in this manual.

This manual is designed for the C500-LK009-V1 and C200H-LK401 PC Link Units. These are some-

times referred to as the LK009-V1 and LK401. The older 3G2A5-LK003-E and 3G2A5-LK009-E PC

Link Units are mentioned only to allow combination with the newer models, and are not discussed in

detail.

WARNING Failure to read and understand the information provided in this manual may result in

personal injury or death, damage to the product, or product failure. Please read each

section in its entirety and be sure you understand the information provided in the section

and related sections before attempting any of the procedures or operations given.

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PRECAUTIONS

This section provides general precautions for using the Programmable Controller (PC) and related devices.

The information contained in this section is important for the safe and reliable application of the PC. You must read

this section and understand the information contained before attempting to set up or operate a PC system.

1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Application Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Safety Precautions

Intended Audience

This manual is intended for the following personnel, who must also have knowl-

edge of electrical systems (an electrical engineer or the equivalent).

• Personnel in charge of installing FA systems.

• Personnel in charge of designing FA systems.

• Personnel in charge of managing FA systems and facilities.

General Precautions

The user must operate the product according to the performance specifications

described in the operation manuals.

Before using the product under conditions which are not described in the manual

or applying the product to nuclear control systems, railroad systems, aviation

systems, vehicles, combustion systems, medical equipment, amusement

machines, safety equipment, and other systems, machines, and equipment that

may have a serious influence on lives and property if used improperly, consult

your OMRON representative.

Make sure that the ratings and performance characteristics of the product are

sufficient for the systems, machines, and equipment, and be sure to provide the

systems, machines, and equipment with double safety mechanisms.

This manual provides information for programming and operating OMRON PCs.

Be sure to read this manual before attempting to use the software and keep this

manual close at hand for reference during operation.

WARNING It is extreme important that a PC and all PC Units be used for the specified

purpose and under the specified conditions, especially in applications that can

directly or indirectly affect human life. You must consult with your OMRON

representative before applying a PC System to the abovementioned

applications.

Safety Precautions

WARNING Do not attempt to take any Unit apart while the power is being supplied. Doing so

may result in electric shock.

WARNING Do not touch any of the terminals or terminal blocks while the power is being

supplied. Doing so may result in electric shock.

WARNING Do not attempt to disassemble, repair, or modify any Units. Any attempt to do so

may result in malfunction, fire, or electric shock.

xii

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Application Precautions

Operating Environment Precautions

Caution Do not operate the control system in the following locations:

• Locations subject to direct sunlight.

• Locations subject to temperatures or humidity outside the range specified in

the specifications.

• Locations subject to condensation as the result of severe changes in tempera-

ture.

• Locations subject to corrosive or flammable gases.

• Locations subject to dust (especially iron dust) or salts.

• Locations subject to exposure to water, oil, or chemicals.

• Locations subject to shock or vibration.

Caution Take appropriate and sufficient countermeasures when installing systems in the

following locations:

• Locations subject to static electricity or other forms of noise.

• Locations subject to strong electromagnetic fields.

• Locations subject to possible exposure to radioactivity.

• Locations close to power supplies.

Caution The operating environment of the PC system can have a large effect on the lon-

gevity and reliability of the system. Improper operating environments can lead to

malfunction, failure, and other unforeseeable problems with the PC system. Be

sure that the operating environment is within the specified conditions at installa-

tion and remains within the specified conditions during the life of the system.

Application Precautions

Observe the following precautions when using the PC system.

WARNING Always heed these precautions. Failure to abide by the following precautions

could lead to serious or possibly fatal injury.

• Always ground the system to 100 Ω or less when installing the Units. Not con-

necting to a ground of 100 Ω or less may result in electric shock.

• Always turn OFF the power supply to the PC before attempting any of the fol-

lowing. Not turning OFF the power supply may result in malfunction or electric

shock.

• Mounting or dismounting I/O Units, CPU Units, Memory Units, or any other

Units.

• Assembling the Units.

• Setting DIP switches or rotary switches.

• Connecting cables or wiring the system.

• Connecting or disconnecting the connectors.

Caution Failure to abide by the following precautions could lead to faulty operation of the

PC or the system, or could damage the PC or PC Units. Always heed these pre-

cautions.

• Fail-safe measures must be taken by the customer to ensure safety in the

event of incorrect, missing, or abnormal signals caused by broken signal lines,

momentary power interruptions, or other causes.

xiii

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Safety Precautions

• Always use the power supply voltages specified in this manual. An incorrect

voltage may result in malfunction or burning.

• Take appropriate measures to ensure that the specified power with the rated

voltage and frequency is supplied. Be particularly careful in places where the

power supply is unstable. An incorrect power supply may result in malfunction.

• Install external breakers and take other safety measures against short-circuit-

ing in external wiring. Insufficient safety measures against short-circuiting may

result in burning.

• Do not apply voltages to the Input Units in excess of the rated input voltage.

Excess voltages may result in burning.

• Do not apply voltages or connect loads to the Output Units in excess of the

maximum switching capacity. Excess voltage or loads may result in burning.

• Disconnect the functional ground terminal when performing withstand voltage

tests. Not disconnecting the functional ground terminal may result in burning.

• Be sure that all the mounting screws, terminal screws, and cable connector

screws are tightened to the torque specified in this manual. Incorrect tighten-

ing torque may result in malfunction.

• Leave the label attached to the Unit when wiring. Removing the label may re-

sult in malfunction if foreign matter enters the Unit.

• Remove the label after the completion of wiring to ensure proper heat dissipa-

tion. Leaving the label attached may result in malfunction.

• Double-check all wiring and switch settings before turning ON the power sup-

ply. Incorrect wiring may result in burning.

• Wire correctly. Incorrect wiring may result in burning.

• Mount Units only after checking terminal blocks and connectors completely.

• Be sure that the terminal blocks, Memory Units, expansion cables, and other

items with locking devices are properly locked into place. Improper locking

may result in malfunction.

• Check the user program for proper execution before actually running it on the

Unit. Not checking the program may result in an unexpected operation.

• Confirm that no adverse effect will occur in the system before attempting any of

the following. Not doing so may result in an unexpected operation.

• Changing the operating mode of the PC.

• Force-setting/force-resetting any bit in memory.

• Changing the present value of any word or any set value in memory.

• Resume operation only after transferring to the new CPU Unit the contents of

the DM Area, HR Area, and other data required for resuming operation. Not

doing so may result in an unexpected operation.

• Do not pull on the cables or bend the cables beyond their natural limit. Doing

either of these may break the cables.

• Do not place objects on top of the cables or other wiring lines. Doing so may

break the cables.

• Use crimp terminals for wiring. Do not connect bare stranded wires directly to

terminals. Connection of bare stranded wires may result in burning.

• When replacing parts, be sure to confirm that the rating of a new part is correct.

Not doing so may result in malfunction or burning.

• Before touching a Unit, be sure to first touch a grounded metallic object in order

to discharge any static built-up. Not doing so may result in malfunction or dam-

age.

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SECTION 1

Introduction

1-1 PC Link Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-2 Operating Levels and Polling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Operating Levels and Polling

Section 1-2

1-1

PC Link Systems

A PC Link System is established to interconnect two or more C-series PCs

through PC Link Units to allow data transfer through the LR area of each PC.

PC Link Subsystems can be established within the PC Link System, creating

different levels of operation. Each PC in the PC Link System automatically

exchanges data with all the PCs in the same Subsystem. Any PC in two Sub-

systems (i.e., any PC to which two PC Link Units are mounted) can be used

as a “transfer PC” to transfer data between two PC Link Subsystems.

The data communications provided by PC Link Systems allow use of the in-

puts and outputs on all of the PCs in the System in the program of any PC.

PC Link Systems do not establish hierarchies of control between PCs. i.e., all

control actions must be written in the programs of individual PCs.

Compared with I/O Links

PC Link Systems exchange data differently to I/O Links in Optical Remote I/O

Systems in three main ways. First, an I/O Link requires the use of I/O points,

reducing the number of I/O points available to connect to I/O devices. Sec-

ond, the number of bits transferred between PCs in a PC Link System is lim-

ited only by the size of the LR area and the number of PCs in the PC Link

System; an I/O Link in a Remote Optical System can handle only one or two

words. Third, I/O Links use programmed input and output operations to trans-

fer data, whereas PC Link Systems use an automatic polling method.

Effective I/O Utilization

Simplified System Setup

PC Link Systems access only the LR area of the PC for data exchange and

do not require the use of any of the PCs I/O points.

Settings on the PC Link Units allow for data exchange little or no program-

ming required.

Subsystem Data Exchange Two PC Link Subsystems operating at different levels can exchange data via

the LR area of a PC operating in both Subsystems.

LK009-V1 Improvements

The C500-LK009-V1 differs from the 3G2A5-LK009 in insulation of the trans-

mission section from the internal circuits to improve anti-noise performance.

This increased performance reduces noise interfere originating in ground dif-

ferences, cable inductance, etc. The C500-LK009-V1 can also be used to-

gether with the C200H-LK401. This is not possible with the 3G2A5-LK009.

Although not covered in detail in this manual, the LK003-E PC Link Unit can

be used in PC Link Systems together with the LK009-V1 PC Link Unit. If the

LK003-E is used, the PC Link System must be single-level and all LK009-V1

PC Link Units in the System must be set to LK003-E mode. The LK003-E (or

an LK009-V1 in LK003-E mode) can be used only on C500 PCs and cannot

be used in the same PC Link System as a C200H-LK401 PC Link Unit.

LK003-E PC Link Units

1-2

Operating Levels and Polling

All PC Link Units are assigned unit numbers which determine what part of

the LR area each is to be allocated. Whenever two or more PCs are con-

nected in a PC Link System, one of the PC Link Units must be set as the poll-

ing unit (i.e., as Unit #0) and all other PC Link Units must be set as polled

units (i.e., as any Unit other than #0). The polling unit of each PC Link Sub-

system does not control the other PCs, which are each controlled independ-

ently by their own CPUs.

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Operating Levels and Polling

Section 1-2

A maximum of two PC Link Units can be mounted to the same PC. If two PC

Link Units are mounted to one PC anywhere in the System, the System is

multilevel, and all Units must be set for a Multilevel System (see 4-2-2 Switch

Settings). In a Multilevel System, operating levels must be set to create PC

Link Subsystems. Each Subsystem will have its own polling unit.

Up to four Subsystems are possible. There will always be one more Subsys-

tem than there are PCs to which two PC Link Units are mounted. Only oper-

ating levels 0 and 1 are set, as it is necessary only to differentiate between

two PC Link Units on the same PC. All of the PC Link Unit in the same Sub-

system must be set to the same level.

A PC Link System with three Subsystems is shown below. Any one of the PC

Link Units in any Subsystem may be designated as the polling unit. All other

Units would be polled units. The small boxes shown connecting the PC Link

Units are Link Adapters, which are used to connect PC Link Units when more

than two are used in a Subsystem. See following sections for details on Sys-

tem design and Link Adapters. (The 3G2A5-LK003-E PC Link Unit cannot be

used in Multilevel Systems.)

PC Link Unit

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SECTION 2

System Design

2-1 System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-2 Using Link Adaptors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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System Configuration

Section 2-1

2-1

System Configuration

PC Link Units are mounted to the PC Racks and connected to each other.

Each PC Link Unit contains a buffer through which data is transferred to and

from the other PC Link Units connected to it. The C500-LK009-V1 can be

used with C500, C1000H, and C2000H PCs, but not with a C200H, C200HS,

or C200HX/HG/HE(-Z) PC. The C200H-LK401 can be used with C200H,

C200HS, and C200HX/HG/HE(-Z) PCs.

Link Adaptors are used in any System other than one containing only two

PC Link Units connected with wire cable. They serve as branching points to

enable connecting more than two PC Link Units, which provide only one con-

nector each allowing only two PC Link Units to be connected directly, or they

serve as conversion points to change between wire and optical fiber

cables.The 3G2A9-AL001 Link Adapter is used as the Branching Link Adapt-

er (see Example 3, below), and combinations of the 3G2A9-AL004 and

3G2A9-AL002 Link Adapters are used to convert to and from optical fiber

cable.Refer to the Link Adapter Installation Guide for Link Adapter specifica-

tions and details.

Multilink Systems

Each PC Link Unit has only one connector, making it impossible to connect

more than two PC Link Units directly. Many more PCs can become part of

the same PC Link System however, if Branching Link Adapters are used to

connect through. A PC Link System including six PCs is illustrated below to

show this. This arrangement also protects PC Link communications from

shutting down completely for failures in the line, i.e., if communications are

broken off on a branch line, data transfer will continue to PCs still connected

though PC Link Units to the polling unit.

PC with PC

Link Unit

PC with PC

Link Unit

PC with PC

Link Unit

PC with PC

Link Unit

Link Adapters

PC with PC

Link Unit

PC with PC

Link Unit

Multilevel Systems

Up to two PC Link Units can be mounted to one PC. Any PC with two PC

Link Units mounted to it or any PC part of a PC Link System that contains

such a PC is in a Multilevel PC Link System. If any one PC in the PC Link

System has two PC Link Units mounted to it, the entire System is multilevel.

Each group of PCs connected by PC Link Units and sharing parts of the LR

area are part of the same PC Link Subsystem. If a PC has two PC Link

Units mounted to it, it is part of two PC Link Subsystems, with each Subsys-

tem extending from a PC with two PC Link Units to either the end PC or the

next PC with two PC Link Units (see diagram below).

Each Subsystem will have its own polling unit. Each Subsystem is also as-

signed an operating level to differentiate the two Subsystems to which one

PC belongs. These operating levels do not imply a hierarchy or in anyway

affect operation of the Subsystems except to determine which LR words are

allocated to which Subsystem (see next subsection for details).

The following example conceptually shows a Multilevel PC Link System with

three Subsystems. Although Subsystems 1 and 3 are assigned the same

operating level, they are not related in any special way.

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System Configuration

Section 2-1

Note that a Link Adapter is not used in Subsystem 3. As explained above, it

does not require any because it contains only two PCs.

CPU Rack

Subsystem 1

operating level 1

PC Link Unit

CPU Rack

CPU

Link

Adapter

Link

Adapter

Link

Adapter

PC Link Unit

Link

Adapter

Link

Adapter

CPU

Subsystem 3

operating level 1

CPU Rack

PC Link Unit

CPU

Subsystem 2

operating level 0

Transfer PCs

A PC that has two PC Link Units mounted to it is called a transfer PC. This is

because it can be used to transfer data between the two PC Link Subsys-

tems to which it belongs.

Although all the PCs in the same Subsystem automatically have data written

into their LR areas from the PCs in the same Subsystem, this is not the case

with PCs in different Subsystems. A PC that belongs to two Subsystems can,

however, transfer data between Subsystems by reading it from any part of

the LR words it shares with one of the Subsystems and writing the data to

the words allocated it in the other Subsystem. This transfer operation is pro-

grammed by the user in the normal user program.

Transmission Distance

The total length of wire cable (e.g., RS-485 or RS-422) must not exceed 500

m. Individual branch lines from Link Adapters to PC Link Units must not ex-

ceed 10 m. Greater transmission distances can be achieved by using optical

links between PC Link Units (see Section 2 Link Adapters).

The following examples demonstrate some of the ways that PCs can be con-

nected in PC Link Systems. Example 3 also provides the appearance two of

the CPU Racks in the System.

Examples

An example of a PC Link System designed using optical links is provided in

2-2 Using Link Adapters.

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System Configuration

Section 2-1

Example 1

Single-level System

C-series PC

Polled PC

Link Unit

Polled PC

Link Unit

Polled PC

Link Unit

Polling PC

Link Unit

Link

Adaptor

Link

Adaptor

Link

Adaptor

Link

Adaptor

Polled PC

Link Unit

Polled PC

Link Unit

C-series PC

Example 2

Two-level System

C-series PC

Polled PC

Link Unit

Polling PC

Link Unit

Polling PC

Link Unit

Link

Adapter

Polled PC

Link Unit

Link

Adapter

C-series PC

Polled PC

Link Unit

Polled PC

Link Unit

C-series PC

Example 3

Three-level System

Polled PC

Link Unit

Polling PC

Link Unit

Polled PC

Link Unit

Polled PC

Link Unit

C-series PC

Polling PC

Link Unit

Polling PC

Link Unit

C-series PC

C500 CPU Rack

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System Configuration

Section 2-1

System Limitations

The maximum number of PCs that may be used in a PC Link System is lim-

ited by the number of LR words available. This is determined by the number

of levels, the specific PCs employed, and the mode settings on the PC Link

Units.

A PC Link Unit must be assigned a number no greater than one less than the

maximum number of allowable PCs to be acknowledge as part of the Sys-

tem. A PC Link Unit assigned a number greater than this limit will not be ac-

knowledged. The maximum number of Units available in a specific PC Link

System is described in the following tables.

Only the PC Link Unit combinations shown below are possible. Note particu-

larly that the LK003-E (or LK009-V1 in LK003-E mode) can only be used with

other LK003-E PC Link Units (or LK009-V1 in LK003-E mode).

Polling Unit: C200H-LK401 PC Link Unit on C200H, C200HS, or C200HX/HG/HE(-Z) PC

Polled units

LK401 on

C200H, C200HS, or

C200HX/HG/HE(-Z)

LK009-V1 on C1000H

or C2000H

LK009-V1 on C500

Max. total

Multilevel

Single-level

Polling Unit: C500-LK009-V1 PC Link Unit on C1000H or C2000H PC

Polled units

LK401 on

C200H, C200HS, or

C200HX/HG/HE(-Z)

LK009-V1 on C1000H

or C2000H

LK009-V1 on C500

Max. total

Multilevel

Single-level

Polling Unit: C500-LK009-V1 PC Link Unit on C500 PC

Polled units

LK009-V1 on

C1000H or

C500

LK401 on

LK003-E on C500 C200H, C200HS, or

C200HX/HG/HE(-Z)

Max. total

C2000H

Multilevel

Single-level

LK003-E mode

Not possible

Not possible.

Not possible

Not possible.

Polling Unit: 3G2A5-LK003-E PC Link Unit on C500 PC

Polled units

LK009-V1 on C500 in LK003-E

mode

LK003-E on C500

Max. total

Single-level

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Using Link Adaptors

Section 2-2

2-2

Using Link Adaptors

In a PC Link System, Link Adapters are used whenever more than two PC

Link Units are connected in any one PC Link Subsystem. They are also used

to enable optical links between PC Link Units to provide greater transmission

distance and greater noise resistance. When using Link Adaptors, refer to

the Link Adaptor Installation Guide.

Optical Cable in PC Link

Systems

A PC Link System can be set up to take advantage of optical communica-

tions by using combinations of Branching and Converting Link Adapters. As

shown below, each PC Link Unit is connected to a Converting Link Adapter

that converts to optical communications. Optical fiber cable is then used to

form the main line and branch lines that connect each PC Link Unit-Convert-

ing Link Adapter pair.

The straight lines in the following diagram represent wire cables; those with

zig-zags in them, optical fiber cable.

In the following example, any of the PC Link Units may be set as the polling

unit.

AL004 Link

Adapter

AL002 Link

Adapter

AL002 Link

Adapter

AL004 Link

Adapter

PC Link Unit

C-series PC

PC Link Unit

C-series PC

Optical fiber

AL004 Link

Adapter

AL004 Link

Adapter

PC Link Unit

C-series PC

PC Link Unit

C-series PC

Handling Optical Fiber

Cable

Although special characteristics of optical fibers call for care in connecting

optical devices, laying optical fiber cable basically does not differ from laying

wire cable. All OMRON PCF and the 3G5A2-PF101 APF (length: 1 m) cable

come with connectors attached. Connectors for all other APF cables must be

assembled by the customer. As using Optical Fiber cable requires the use of

Link Adaptors, refer to the Link Adaptor Installation Guide for more detailed

information.

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SECTION 3

Data Exchange and Operations

3-1 LR Area Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2 LR Area Allocations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3 LR Area Division Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-4 Data Exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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LR Area Data

Section 3-1

3-1

LR Area Data

PC Link Systems employ the LR area in the exchange of data. The content

of the LR areas in all PCs in the same PC Link Subsystem (or Single-level

System) is kept consistent. To achieve this, the LR area is divided among all

of the PCs in the Subsystem according to switch settings, and each PC

writes data only to the part of the LR area allocated to it. When a PC writes to

its LR area, the data is updated in the LR areas of all the other PCs in the PC

Link Subsystem during the next polling cycle. The other PCs can then read

this data and use it to coordinate activities with the PC that has written the

data. Each PC thus writes data to its write words and reads data from the

words written to by all of the other PC Link Units in the same Subsystem. Any

action that affects the contents of the LR area is reflected in the LR area in all

PCs. The data transfer is shown below in a Single-level System. Arrows indi-

cate data flow within the PC Link System.

“Write area” is the area written by that Unit. ”Read area” is an area read by

that Unit (i.e., written by another Unit). All unused portions of the LR area

may be used as work bits in programming.

Data

Read

area

Read

area

Read

area

Read

area

Read

area

Read

area

Read

area

Read

area

Read

area

Data

Read

area

Read

area

Read

area

What determines what part of the LR area is allocated to which PC is the unit

number assigned to each PC Link Unit. These numbers in turn determine which

PC Link Units are polling units and which are polled units.

When PC Link Unit 0 is set for the total number of LR bits used, and each of

the PC Link Units is assigned a unit number, the LR area is divided and as-

signed to each PC Link Unit automatically.

In a Multilevel System, all PCs have their LR areas divided in half, with one

half being assigned to each of two Subsystems. This is true regardless of

whether or not the PC is actually in two Subsystems, i.e., if only one PC Link

Unit is mounted to a PC in a Multilevel System, one have of the LR area is

not used by the PC Link System.

Each PC in two Subsystems (i.e.,with two PC Link Units mounted to it) thus

contains all the LR area data from both Subsystems and has a write data

area in assigned to each. Any PC with only one PC Link Unit contains only

the LR area data for the Subsystem it is in. The LR area of any PC with two

PC Link Units (i.e., the data-transfer PCs) can thus be used to transfer data

between two Subsystems by programming the data-transfer PC to move data

between its section of the first half and its section of the last half of its LR

area. See Section 6 Application Examples for specific LR area allocation ex-

amples for both Single-level and Multilevel Systems.

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LR Area Allocations

Section 3-2

3-2

LR Area Allocations

To enable data transfer between PCs in an PC Link System, part of the LR

area is allocated as the write area for each PC in the System. Which and how

many LR words are allocated to each PC are determined by switch settings,

which are described in 4-2-2 Switch Settings. This section describes the

method for allocating words assuming that each PC is allocated the maxi-

mum number of words possible.

LR Area Allocation in

Mixed-PC Systems

If a System contains PCs that have different sizes of LR areas, only the

words that are common to both areas are used in actual PC Link communi-

cations. In the following example, the LR areas of each PC are illustrated

below it. Words labeled “work words” are not used by the PC Link System

and are available for use in programming if required. As shown, the rest of

the LR area is divided with the smaller LR area of the other PC to form the

write words for each.

C1000H CPU Rack

C500 CPU Rack

PC Link Units

C1000H CPU

C500 CPU

LR 00 to LR 15

LR 0186 to LR 1351

LR 00 to LR 15

LR 16 to LR 31

LR 32 to LR 63

Work words

Single-level System

The following example combines one C2000H PC, two C500 PCs, and a

C200H PC in a Single-level System using 128 LR bits per PC. The PC Link

Unit on the C2000H PC at the left end of the System has been designated as

the polling unit. The C500 PCs, providing the smallest LR areas, limit the

number of bits that can be transferred via the PC Link Units. Because the

C500 PC has only 32 words, only words 00 through 31 may be used in the

C2000H PCs (Units #0 and #2). The C2000H and C200H LR words that are

not used (32 to 63) may be used as work bits in programming. The LR word

allocations for each PC Link Unit are given below it. The shaded area is the

section of the LR area written to by the PC Link Unit. The arrows indicate

data flow.

In this example, data written to words LR 8 through 15 by the PC to which PC

Link Unit 2 is mounted is automatically transmitted to words LR 8 through 15

in the other PCs. While the PCs for PC Link Units #0, #1, and #3 are able to

read this data freely, they cannot write in this area. All of the other PCs also

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LR Area Allocations

Section 3-2

are assigned the word shaded below them which they write and can be writ-

ten by the other PCs.

C500 CPU Rack

C200H CPU Rack

PC Link Unit 0

C2000H CPU Rack

PC Link Unit 2

PC Link Unit 1

PC Link Unit 3

C2000H CPU

Unit 0

C500 CPU

Unit 1

C500 CPU

Unit 2

C200H CPU

Unit 3

LR 00 to LR 07

LR 08 to LR 15

LR 16 to LR 23

LR 24 to LR 31

LR 00 to LR 07

LR 08 to LR 15

LR 16 to LR 23

LR 24 to LR 31

LR 00 to LR 07

LR 08 to LR 15

LR 16 to LR 23

LR 24 to LR 31

LR 08 to LR 15

LR 16 to LR 23

LR 24 to LR 31

Useable

as work

bits

Useable

as work

bits

LR 32 to LR 63

Note The C200H could be replaced by the C200HS and C200HX/HG/HE(-Z) with-

out any changes in this example.

LR Area Allocations in

Multilevel Systems

In a Multilevel PC Link System, only half of the LR area in each PC is used

for communications in any one PC Link Subsystem. The first half of the

words (from word 00) is used by the Subsystem assigned operating level 0;

the second half, by the Subsystem assigned operating level 1. This is true

regardless of whether or not a PC is actually in two Subsystems. In the ex-

ample on the next page, the two C500s do not use LR words 16 through 31

because they are not in a Subsystem in operating level 1. If another PC Link

Unit was later added to either PC, these words would be available for use by

it. The number of words used by a Subsystem is thus half of the number of

words provided by the PC with the smallest LR area.

Once the words used in a Subsystem are determined, the process is the same

as for any other PC Link System: words common to all of the PCs in a Subsystem

are divided evenly among the PC Link Units, with unit numbers determining

which words are allocated to which Unit. Again, the Unit assigned number 0 in

each Subsystem is the polling unit for that Subsystem.

Below are provided the system configuration, unit numbers, operating levels,

and word allocations for each PC Link Unit in a Multilevel System. The vertical

bars represent the LR area in each PC. Arrows indicate data flow from the words

written to by each PC. Write words for each PC have been shaded.

In the Subsystem assigned operating level 1, LR words 56 through 63 are not

used for PC Link communications because switch settings are available only for

2, 4, 8, or 16 PC Link Units per Subsystem. If a fourth PC was added to this Sub-

system, it would be assigned these words.

Although not used by the PC Link System, words labeled “not used” may be

used as work words in programming to manipulate data within the CPU.

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LR Area Allocations

Section 3-2

In the example below, the C2000H PC would be a transfer PC and could be used

to transfer data between the two Subsystems, e.g., to write to LR word12 by the

C200H PC in operating level 0 to LR word 32, one of its write words in operating

level 1. Any PC in level 1 could then access this data directly from LR word 32 in

its own LR area.

C500 CPU Rack

C2000H CPU Rack

PC Link Unit 0

C200H CPU Rack

PC Link Unit 2

PC Link Unit 1

PC Link Unit 3

C200H CPU Rack

PC Link Unit 0

Operating

level 0

C1000H

CPU

Rack

PC Link Unit 2

PC Link Unit 1

Operating

level 1

C2000H CPU

Unit 0, level 0

C500 CPU

Unit 1, level 0

C500 CPU

Unit 2, level 0

C200H CPU

Unit 3, level 0

LR 00 to LR 03

LR 04 to LR 07

LR 08 to LR 11

LR 12 to LR 15

LR 04 to LR 07

LR 08 to LR 11

LR 12 to LR 15

LR 04 to LR 07

LR 08 to LR 11

LR 12 to LR 15

LR 04 to LR 07

LR 08 to LR 11

LR 12 to LR 15

Useable

as work

bits.

Useable

as work

bits.

Useable

as work

bits.

LR 16 to LR 31

LR 32 to LR 63

(level 1)

(continued below)

Useable

as work

bits.

C200H CPU

Unit 2, level 1

C1000H CPU

Unit 1, level 1

(level 1)

Useable

as work

bits.

LR 00 to LR 31

(level 0)

Unit 0, level 1

LR 32 to LR 39

LR 40 to LR 47

LR 48 to LR 55

LR 56 to LR 63

LR 32 to LR 39

LR 40 to LR 47

LR 48 to LR 55

LR 56 to LR 63

LR 40 to LR 47

LR 48 to LR 55

LR 56 to LR 63

Useable

as work

bits.

Useable

as work

bits.

Note The C200H could be replaced by the C200HS and C200HX/HG/HE(-Z) with-

out any changes in this example.

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LR Area Allocations

Section 3-2

System with Three

Subsystems

The following example combines a C2000H PC, fourteen C500 PCs, and

fifteen C200H PCs in a Multilevel System with three Subsystems. Not all PCs

are shown below; missing Units are indicated by dotted lines. The PC Link

Unit farthest to the left in each Subsystem has been designated as the poll-

ing unit. The C500 PCs, providing the smallest LR area in their Subsystems,

limit the number of bits that can be transferred via the PC Link Units. The LR

word allocations for each PC Link Unit are given below it. The shaded area is

the section(s) of the LR area written to by the PC Link Unit(s).

In this example, data written to LR 03 by the PC with PC Link Unit 1 of the

leftmost Subsystem (level 0) is automatically transmitted to LR 03 in the

other PCs of that Subsystem. To make the data available to the middle Sub-

system (level 1), it is necessary for the transfer PC to transfer the data from

LR 03 to LR 32 or LR 33 (the level 1 write words for that PC). To do this, the

PC must be programmed with MOV LR 03 to LR 32 or LR 33. The data is

then automatically transmitted to LR 16 or LR 17 in the other PCs of the mid-

dle Subsystem. To make the data available to the rightmost Subsystem (level

0), it is necessary for the transfer PC to transfer the data from LR 16 or LR

17 to LR 00 or LR 01. Again, the MOV instruction is utilized.

Because this is a Multilevel System, only half of the available LR words may

be used by each Subsystem: the first half by the level 0 Subsystems, the

second half by the level 1 Subsystem. The unused LR words in each PC may

be used as work bits in programming.

C2000H PC

Unit 0,

level 0

C200H PC

Unit 1,

level 0

C500 PC

Unit 1,

level 1

C1000H PC

Unit 1,

level 0

C1000H PC

Unit 7,

level 0

C200H PC

Unit 15,

level 0

Unit 0,

level 1

C500 PC

Unit 7,

level 1

Unit 0,

level 0

Note The C200H could be replaced by the C200HS and C200HX/HG/HE(-Z) with-

out any changes in this example.

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LR Area Division Tables

Section 3-3

C2000H PC

Unit 0,

level 0

C200H PC

Unit 1,

level 0

C200H PC

Unit 15, level 0 as work

Unit 0, level 1

Useable C500 PC

C500 PC

Unit 7, level 1

Unit 0, level 0

C1000H PC

Unit 1,

level 0

C1000H PC

Unit 7,

level 0

Unit 1,

level 1

bits

Unit 0,

level 0

Unit 0, LR 02 & LR 03

level 1

LR 00 & LR 01

LR 02 & LR 03

LR 00 & LR 01

LR 02 & LR 03

Unit 0, level 0

Unit 1, level 0

LR 00 & LR 01

LR 02 & LR 03

LR 00 & LR 01

LR 02 & LR 03

LR 00 & LR 01

LR 02 & LR 03

LR 00 to

LR 15

Unit 7, level 0

LR 14 & LR 15

LR 16 & LR 17

LR 18 & LR 19

LR 14 & LR 15

LR 16 & LR 17 Unit 0, level 1

LR 18 & LR 19 Unit 1, level 1

LR 16 to

LR 31

LR 16 to

LR 31

Unit 15

LR 30 & LR 31

level 0

LR 30 & LR 31

LR 32 & LR 33

LR 34 & LR 35

LR 30 & LR 31 Unit 7, level 1

LR 30 & LR 31

LR 46 & LR 47

LR 32 to

LR 63

LR 32 to

LR 63

LR 32 to

LR 63

LR 32 to

LR 63

LR 48 to

LR 63

Useable as work bits

3-3

LR Area Division Tables

The PC Link Unit has the ability to transfer from 2 to 32 words (32 to 512

bits) of data between PCs. The LR area is divided according to the number of

PC Link Units and the number of Subsystems in the System. Refer to the

appropriate table for your System. Any unused portion of the LR area may be

used as work bits. The number of LR bits transferred per Unit and Single-le-

vel/Multilevel designation are made on switches on the PC Link Units.

Single-level Systems

C200H, C200HS, C200HX/HG/HE(-Z), C1000H, or C2000H PCs

No. of PC Link Units

17 to 32

9 to 16

5 to 8

128

3 or 4

256

512

LR Wd

0 and 1

2 and 3

LR bits/Unit

Unit #0

Unit #1

Unit #2

Unit #3

Unit #0

Unit #1

Unit #2

Unit #3

Unit #4

Unit #5

Unit #6

Unit #7

Unit #8

Unit #9

Unit #10

Unit #11

Unit #12

Unit #13

Unit #14

4 and 5

Unit #1

Unit #2

Unit #3

Unit #4

Unit #5

Unit #6

Unit #7

6 and 7

8 and 9

10 and 11

12 and 13

14 and 15

16 and 17

18 and 19

20 and 21

22 and 23

24 and 25

26 and 27

28 and 29

Unit #1

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LR Area Division Tables

Section 3-3

30 and 31

Unit #15

Unit #16

Unit #17

Unit #18

Unit #19

Unit #20

Unit #21

Unit #22

Unit #23

Unit #24

Unit #25

Unit #26

Unit #27

Unit #28

Unit #29

Unit #30

Unit #31

32 and 33

34 and 35

36 and 37

38 and 39

40 and 41

42 and 43

44 and 45

46 and 47

48 and 49

50 and 51

52 and 53

54 and 55

56 and 57

58 and 59

60 and 61

62 and 63

Unit #8

Unit #4

Unit #5

Unit #6

Unit #7

Unit #2

Unit #1

Unit #9

Unit #10

Unit #11

Unit #12

Unit #13

Unit #14

Unit #15

Unit #3

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LR Area Division Tables

Section 3-3

C500 PCs

If the LK003-E is used or LK-009-E(-V1) is used in LK003 mode, the right-

most three columns of the following table can be applied.

No. of PC Link Units

5 to 8

3 or 4

128

LR Wd

0 and 1

2 and 3

LR bits/Unit

256

Unit #0

Unit #1

Unit #2

Unit #3

Unit #4

Unit #5

Unit #6

Unit #7

4 and 5

Unit #1

Unit #2

Unit #3

Unit #4

Unit #5

Unit #6

Unit #7

6 and 7

8 and 9

Unit #1

Unit #2

Unit #3

10 and 11

12 and 13

14 and 15

16 and 17

18 and 19

20 and 21

22 and 23

24 and 25

26 and 27

28 and 29

30 and 31

Unit #1

Usable as

work bits.

Multilevel Systems

In a System with more than two Subsystems, the same data applies to any

Subsystems designated level 0 and those Subsystems designated level 1.

C200H, C200HS, C200HX/HG/HE(-Z), C1000H, or C2000H PCs

Level 0

No. of PC Link Units

9 to 16

5 to 8

3 or 4

128

LR Wd

0 and 1

2 and 3

LR bits/Unit

256

Unit #0

Unit #1

Unit #2

Unit #3

Unit #4

Unit #5

Unit #6

Unit #7

Unit #8

Unit #9

Unit #10

Unit #11

Unit #12

Unit #13

Unit #14

Unit #15

4 and 5

Unit #1

Unit #2

Unit #3

Unit #4

Unit #5

Unit #6

Unit #7

6 and 7

8 and 9

Unit #1

Unit #2

Unit #3

10 and 11

12 and 13

14 and 15

16 and 17

18 and 19

20 and 21

22 and 23

24 and 25

26 and 27

28 and 29

30 and 31

Unit #1

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LR Area Division Tables

Section 3-3

Level 1

No. of PC Link Units

9 to 16

5 to 8

3 or 4

128

256

LR Wd

LR bits/Unit

32 and 33

34 and 35

Unit #0

Unit #1

Unit #2

Unit #3

Unit #4

Unit #5

Unit #6

Unit #7

Unit #8

Unit #9

Unit #10

Unit #11

Unit #12

Unit #13

Unit #14

Unit #15

36 and 37

38 and 39

40 and 41

42 and 43

44 and 45

46 and 47

48 and 49

50 and 51

52 and 53

54 and 55

56 and 57

58 and 59

60 and 61

62 and 63

Unit #1

Unit #2

Unit #3

Unit #4

Unit #5

Unit #6

Unit #7

Unit #1

Unit #2

Unit #3

Unit #1

C500 PCs

Level 0

No. of PC Link Units

5 to 8

3 or 4

128

LR Wd

0 and 1

2 and 3

LR bits/Unit

Unit #0

Unit #1

Unit #0

4 and 5

Unit #2

Unit #3

Unit #4

Unit #5

Unit #6

Unit #7

Unit #1

Unit #2

Unit #3

6 and 7

8 and 9

Unit #1

10 and 11

12 and 13

14 and 15

Level 1

No. of PC Link Units

5 to 8

3 or 4

128

LR Wd

LR bits/Unit

Unit #0

Unit #1

16 and 17

18 and 19

Unit #0

20 and 21

22 and 23

24 and 25

26 and 27

28 and 29

30 and 31

Unit #2

Unit #3

Unit #4

Unit #5

Unit #6

Unit #7

Unit #1

Unit #2

Unit #3

Unit #1

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Data Exchange

Section 3-4

3-4

Data Exchange

System control in a PC Link System is decentralized; the polling unit merely

handles communications among the PC Link Units. A link is established be-

tween the polling unit and a polled unit when the polled unit confirms a sec-

tion of the LR area allocated to it as a write area.

The polling unit polls each PC Link Unit in the System or Subsystem in turn,

sending the most recent LR data for the other PCs in the System and receiv-

ing the most recent LR data from the PC Link Unit being polled. Data is held

in a PC Link Unit in a buffer that is updated by the PC during the PC Link

servicing portion of the PC’s scan. When Units are polled, the RUN and Error

flag statuses for each Unit in the System are also updated. In the following

diagram T is the transmission time per PC (see below).

Polling unit

Unit 1

Unit 2

Unit n

Polled unit

Total polling time = T x number of PC Link Units + 10 ms

If an error occurs during transfer, communication is broken either partially or

completely (see 7-1 SR Area Flags for details), preventing LR data from be-

ing updated, although the most recent data is normally preserved, even for

power failures.

Maximum and Minimum

Polling Time

The maximum time required per PC scan for PC Link Unit transmissions de-

pends on the number of PC Link Units in the System and the number of LR

bits transferred per PC, i.e., the maximum time is the time required to service

all PCs and update all LR words in each. The equation for this is given below.

The final 10 ms is required for processing at the end of transmission.

Maximum transmission time =

transmission time per PC Link Unit x number of PC Link Units + 10 ms

The minimum transmission time is the transmission time for one PC Link Unit

plus the post-transfer processing time:

Minimum transmission time =

transmission time for one PC Link Unit + 10 ms

Transmission Time per PC Link Unit

Number of LR bits

Transmission time

128

256

512

2.2 ms

2.5 ms

2.8 ms

3.8 ms

5.8 ms

Induction Sequence

After 256 cycles of PC Link Unit polling, an induction sequence is executed if

any PC Link Units have not been established in communications. This se-

quence is executed for each non-active PC Link Unit to established commu-

nications and requires 15 ms per PC Link Unit.

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Data Exchange

Section 3-4

PC Data Areas

PC Link Units utilize data areas in the PCs for both communication and op-

eration monitoring. These data areas are enumerated in the table below.

C2000H, C1000H, C200H,

C500

C200HS, or C200HX/HG/HE(-Z)

LR Area

LR 0000 to LR 6315 (1,024 bits)

24708 to 24715

LR 0000 to LR 3115 (512 bits)

5808 to 5815

Error flags

24808 to 24815

6208 to 6215

24908 to 24915

25008 to 25015

PC RUN flags 24700 to 24707

24800 to 24807

5800 to 5807

6200 to 6207

24900 to 24907

25000 to 25007

More detailed information about each of the areas is provided in Section 7

Error Processing.

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SECTION 4

Unit Components and Switch Settings

4-1 C200H PC Link Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1-1 Nomenclature, Switches, and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1-2 Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2 C500 PC Link Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2-1 Nomenclature, Switches, and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2-2 Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3 Switch Setting Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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C200H PC Link Units

Section 4-1

4-1

C200H PC Link Units

4-1-1

Nomenclature, Switches, and Indicators

The basic names and functions of PC Link Unit components are given below.

Front Panel

Display

Indicates operational status.

Switches 1 through 4

Used to set the PC Link Unit unit number,

the Special I/O Unit unit number, and the

number of LR bits in the Subsystem.

Switches 5 and 6

Used to set the type of transmission

line and termination resistance.

RS-485 connector

Used to connect the PC Link Unit

to another PC Link Unit or to a

Link Adapter.

Display

RUN

This PC Link Unit

Unit 0

Another PC Link Unit in the System

Error indicator

The LEDs indicate the following :

LED

Function/Meaning

Lit when PC Link Units are operating.

RUN

LINK 0

Lit when PC Link Unit #0 (polling unit) is operating properly. Not lit

when an error has occurred.

THIS

Lit when this PC Link Unit is operating properly. Not lit when an

error has occurred.

OTHER

ERROR

Lit when other PC Link Units are operating properly. Not lit when

an error has occurred.

Light when a unit number is set incorrectly; flashes when an error

has occurred on the links between #0 or others and this PC Link

Unit. Not lit during normal operation.

All LEDs not lit. All LEDs will go out when an error occurs in the PC.

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C200H PC Link Units

Section 4-1

Back Panel

DIP switch (SW7)

Adjusted to select Single/

Multilevel System, operating

level, mode, and number of

I/O refresh words.

Connector

Used to connect the PC

Link Unit to the Rack.

4-1-2

Switch Settings

Switch settings determine how the PC Link Units will work together and how

the LR area will be allocated to data communications. All switches should be

set before mounting a PC Link Unit to the PC.

Note Errors in switch settings, which are not always detected by the System, can

cause incorrect data communications. Set and check all switch settings care-

fully.

Front-panel Switches

The switches on the front panel are numbered from 1 through 4. They are set

using a regular screwdriver. Turn the switch until the desired number appears

in the window. Be careful not to damage the slots on the switches. Do not

leave a switch mid-way between settings.

Switches 1 and 2:

PC Link Unit Number

Switches 1 and 2 determine the PC Link Unit number. Switch 1 is the tens

digit; switch 2, the ones digit. The number of the Unit thus can be read di-

rectly by considering the digits in the windows of switch 1 and switch 2 as a

single number. Each PC Link Unit in every Subsystem must be given its own

unit number. This number will determine the LR words allocated to the Unit.

The Unit assigned number 0 is the polling unit. All other Units are polled

units. Do not use the same unit number more than once in any one Subsys-

tem. Do not set a number higher than one less than the maximum number of

PC Link Units allowed in the System (see 2-1 System Configuration for spe-

cific limits). Errors in setting unit number are sometimes not detected by the

System, leading to incorrect data in the LR area. Set unit numbers carefully.

Switch 3:

Special I/O Unit Number

The C200H-LK401 PC Link Unit is considered a Special I/O Unit for the

C200H, C200HS, or C200HX/HG/HE(-Z) PC and must be assigned a unit

number as such. Set a number between 0 and 9. The unit number assigned

to the PC Link Unit must not be used for any other Special I/O Unit controlled

by the same PC. IR and DM words allocated to the unit number assigned are

not used by the PC Link Unit, and may therefore be used as work bits in pro-

gramming.

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C200H PC Link Units

Section 4-1

Switch 4:

Number of LR Bits

This setting is necessary only on the polling unit (Unit 0). This setting deter-

mines the number of LR bits that will be transferred via the LR area for each

PC Link Unit.

Setting

No. of LR bits

PC Link Units No. of LR bits

PC Link Units

Single-level

Multilevel

128

256

512

Setting

unavailable

As there is a maximum number of LR bits available for use in the LR area

and since the number of available bits must be split equally among the PC

Link Units of the System, as the number of bits required by a particular Unit

increases, the maximum number of PC Link Units in the Subsystem must

decrease. As the number of Units required in the Subsystem increases, the

number of LR bits assigned to each PC Link Unit must decrease.

Switch 5:

Transmission Line Selector

Set switch 5 to the right if only wire cable is used in the System, and to the

left if optical links are used between Link Adapters.

Switch 6:

Termination Resistance

Set switch 6 to the left to connect (turn ON) termination resistance (220 Ω),

and to the right to disconnect (turn OFF) termination resistance. The termina-

tion resistance must be turned ON in the first and last PC Link Units in each

Subsystem.

Switch 7:

Back-panel DIP Switch

Pins 5 through 7 are not used and must be set to OFF. The rest of the pins

are set as described below.

Pins 1 and 2:

I/O Refresh Bits

This setting determines the number of LR bits refreshed during each PC

scan. The number set here must be equal to or greater than the number of

LR bits transferred per PC set on switch 4.

Reducing the number of bits refreshed will shorten the PC scan time, but it

will increase the transmission time in the PC Link System. These relation-

ships are shown in the following tables along with pin settings.

Pin 1

OFF

Pin 2

OFF

No. of refresh bits Increase in scan time

512

256

128

8.9 ms

5.7 ms

3.6 ms

2.8 ms

OFF

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C200H PC Link Units

Section 4-1

The following table shows the number of scans of delay in communication

produced by various numbers of refresh bits and LR bits. The delays given

are for Single-level Systems. Delays in Multilevel Systems would be half of

those shown below.

No. of re- 64

fresh bits

128

256

512

No. of

LR bits

––

128

256

512

––

Note The IORF (97) instruction can be used in programming to refresh LR bits at

particular points in a programming if current LR data is required. Refer to the

Operation Manual for your CPU Unit for details.

Pins 3 and 4:

Levels

When mounting two PC Link Units to the same PC in a Multilevel System, set

one PC Link Unit for operating level 0 and the other for operating level 1. Set

all PC Link Units in each Subsystem to the same operating level. If all PCs in

the System have only one PC Link Unit mounted to them, set all Units for a

Single-level System. There is no difference in the first two settings. Operating

Level flags, AR 2411 and AR 2412, can be used to check operating levels.

Note An error indication will not be made even if two PC Link Units with the same

Subsystem are mounted to the same PC; set and check the pins with care.

SW7

Setting

Single-level

OFF

Single-level

OFF

Multilevel, level 1

Multilevel, level 0

OFF

Pins 8:

Double Allocation Setting

Pin 8 on switch 7 can be turned on to allocate twice the normal number of

words to any polled unit. This is not possible for a polling unit, which will be

allocated the normal number of words regardless of the setting of pin 8.

If pin 8 is left off, the PC Link Unit will be allocated the number of words indi-

cated by setting of switch 4. The actual words will be determined by the unit

number.

If pin 8 is turned on, the PC Link Unit will be allocated the words both for its

unit number and for the next larger unit number, i.e., it will be allocated twice

the number of words set on switch 4. If pin 8 is set for double allocation, do

not use the next larger number for any other PC Link Unit.

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C500 PC Link Units

Section 4-2

Note LR area data will not be accurate if the next larger unit number is set on an-

other PC Link Unit and no error indication will be made.

When a PC Link Unit is set for double allocation, the RUN and Error Flags for

both the assigned unit number and those for the next larger unit number will

operate according to the status of the PC Link Unit.

Pin 8, SW7

OFF

Allocation

Normal

Double

LR Area

for Unit n

Words

for

Unit 0

Words

for Unit

Only these words

allocated normally.

Words for both Unit n

and Unit n+1 allocated

when pin 8 is turned on.

Words

for Unit

n+1

4-2

C500 PC Link Units

4-2-1

Nomenclature, Switches, and Indicators

The basic names and functions of PC Link Unit components are given below.

DIP switch cover

Remove with a regular

screwdriver to access the

DIP switch used to set the

unit number on all PC Link

Units and to set the number

of LR bits in the Subsystem

on Unit 0.

Display

Employed in

either of two ways

depending on the

DIP switch setting

on the back of the

PC Link Unit. (see

below)

LK009-V1

RS-485 connector

Used to connect the PC Link

Unit to another PC Link Unit or

to a Link Adapter.

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C500 PC Link Units

Section 4-2

Display Pattern A

Display Patterns

LK009-V1

Unit 0

Unit 2

Unit 4

Unit 6

Unit 1

Unit 3

Unit 5

Unit 7

Display Pattern B

LK009-V1

Unit 0

This PC Link Unit

Another PC Link

Unit in System

The LED’s indicate the following for either display pattern:

LED status

Meaning

Lit

The specified PC Link Unit is operating properly.

Blinking

An error has occurred in the specified PC Link Unit after

its link to the System is established.

Unlit

The specified PC Link Unit is not linked to the System.

Back Panel

Connector

Used to connect

the PC Link Unit

to the Rack.

DIP switch (SW3)

Adjusted to select

Single/Multilevel

Transmission line selector (SW2)

Adjusted to select electrical cables

or a combination of electrical and

optical fiber cables.

System, operating

level, display pat-

tern, and termina-

tion resistance.

4-2-2

Switch Settings

Switch settings determine how the PC Link Units will work together and how

the LR area will be allocated to data communications. All switches should be

set before mounting a PC Link Unit to the PC.

Note Errors in switch settings, which are not always detected by the System, can

cause incorrect data communications. Set and check all switch settings care-

fully.

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C500 PC Link Units

Section 4-2

Front-panel DIP Switch:

Unit Number

Each PC Link Unit must be given a unit number. This number will determine

the LR words allocated to it. The Unit assigned number 0 is the polling unit.

All other Units are polled units. Do not use the same unit number more than

once in any one Subsystem. Do not set a number higher than one less than

the maximum number of PC Link Units allowed in the System. Remove the

DIP switch cover with a screwdriver and adjust the DIP switch according to

the following tables. Confirm that all switches have been properly set and

that the PC power is off before mounting the PC Link Unit to the PC. Exam-

ple DIP switch settings are presented at the end of this section.

Number of LR bits

(See page 31.)

Unit no.

OFF

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C500 PC Link Units

Section 4-2

Number of LR Bits

The following setting is necessary only on the polling unit (Unit 0). This set-

ting determines the number of LR bits that will be transferred via the LR area

for each PC Link Unit.

On C1000H, or C2000H PC

Number of LR Bits/Maximum PC Link Units per Subsystem

On C500 PC

Single-level

32/32

Multilevel

32/16

64/8

LK003 mode

256/2

Single-level

32/8

Multilevel

32/8

OFF

64/16

128/4

64/8

64/4

128/8

128/4

256/2

64/8

128/4

128/2

256/4

256/2

512/2

Setting unavailable

Back-panel DIP Switch

The back-panel DIP switch is a 4-pin switch, as shown below. Set each of the

pins as described.

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C500 PC Link Units

Section 4-2

Pin 1: Termination

Resistance

To operate properly, the PC Link Unit at each end of the main line of each

Subsystem must have the termination resistance switch turned ON, and all

PC Link Units that branch off the main line must be turned OFF. An example

is provided below. Each large box represents one or two PC Link Units

mounted to a C-series PC; each small box; a Link Adapter. The different lines

represent different Subsystems.

Resistance ON

Resistance OFF

Resistance ON

Resistance OFF

Resistance ON

Resistance OFF

Resistance ON

Resistance OFF

Resistance ON

Resistance OFF

Pin 2: Display Pattern

If eight PC Link Units or fewer are employed in one Subsystem, adjust the

display selector for pattern A by setting this switch OFF. If more than eight

PC Link Units are employed in one level, adjust the display selector for pat-

tern B by setting this switch to ON.

Pins 3 and 4: Levels and

Modes

When mounting two PC Link Units to the same PC in a Multilevel System, set

one PC Link Unit for operating level 0 and the other for operating level 1. Set

all other PC Link Units in each Subsystem to the same operating level. In a

Single-level System (i.e., a System that has no PC with two PC Link Units

mounted to it), designate the mode. Pin combinations are as shown below.

Setting

Single-level, LK009 mode

Single-level, LK003 mode

Multilevel, level 1

OFF

Multilevel, level 0

Switch 2:

Transmission Line Selector

Set this selector to the top position if optical fiber cable is used to connect

Link Adapters. Set it to the bottom position if only electrical cable is used in

the System.

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Switch Setting Example

Section 4-3

4-3

Switch Setting Example

Switch settings for the following System are given below for level 0. The set-

tings for all PC Link Units in level 1 would be the same, except for the level

setting (pins 3 and 4 on the back-panel DIP switches). These are the normal

settings, but not the only ones possible. The System is multilevel with two

Subsystems, contains eight PC Link Units in each Subsystem, and combines

C2000H, C500, and C200H PCs.

C500 PC

C200H PC

Unit 1,

level 0

Unit 2,

level 0

Unit 3,

level 0

C2000H PC

Link

Adaptor

Link

Adaptor

Unit 0

(polling unit),

level 0

C500 PC

C200H PC

Unit 0

(polling unit),

level 1

Unit 1,

level 1

Unit 2,

level 1

Unit 3,

level 1

Link

Adaptor

Link

Adaptor

Note The C200H could be replaced by the C200HS and C200HX/HG/HE(-Z) with-

out any changes in this example.

Unit 0, Level 0

C500-LK009-V1

The transmission line selector is set to the bottom position (no optical links).

The DIP switches are set as follows:

Front-panel DIP Switch

SW1

64 transfer LR bits

Unit 0

Back-panel DIP Switch

SW3

Multilevel System, level 0

Display pattern A

Termination resistance ON

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Switch Setting Example

Section 4-3

Unit 1, Level 0

C500-LK009-V1

The transmission line selector is set to the bottom position (no optical links).

The DIP switches are set as follows:

Front-panel DIP Switch

SW1

Setting not necessary

Unit 1

Back-panel DIP Switch

SW3

Multilevel System, level 0

Display pattern A

Termination resistance OFF

Unit 2, Level 0

C500-LK009-V1

The transmission line selector is set to the bottom position (no optical links).

The DIP switches are set as follows:

Front-panel DIP Switch

SW1

64 transfer LR bits

Unit 2

Back-panel DIP Switch

SW3

Multilevel System, level 0

Display pattern A

Termination resistance OFF

Switches 1 and 2

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Switch Setting Example

Section 4-3

Unit 3, Level 0

C200H-LK401

Switch 3 is set to any number not used by another Special I/O Unit. Switch 4

does not need to be set. Switch 5 is set to the right to designate no optical

links in the System. Switch 6, the termination resistance, is turned ON (to the

left). The other switches are set as shown below.

SW1 SW2

Unit 3

DIP Switch

SW1

Normal Allocation

Not used, turn OFF

Multilevel, level 0

64 I/O

refresh bits

Unit 0, Level 1

C500-LK009-V1

The transmission line selector is set to the bottom position (no optical links).

The DIP switches are set as follows:

Front-panel DIP Switch

SW1

64 transfer LR bits

Unit 0

Back-panel DIP Switch

SW3

Multilevel System, level 1

Display pattern A

Termination resistance ON

Unit 1, Level 1

C500-LK009-V1

The transmission line selector is set to the bottom position (no optical links).

The DIP switches are set as follows:

Front-panel DIP Switch

SW1

Setting not necessary

Unit 1

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Switch Setting Example

Section 4-3

Back-panel DIP Switch

SW3

Multilevel System, level 1

Display pattern A

Termination resistance OFF

Unit 2, Level 1

C500-LK009-V1

The transmission line selector is set to the bottom position (no optical links).

The DIP switches are set as follows:

Front-panel DIP Switch

SW1

64 transfer LR bits

Unit 2

Back-panel DIP Switch

SW3

Multilevel System, level 1

Display pattern A

Termination resistance OFF

Switches 1 and 2

Unit 3, Level 1

C200H-LK401

Switch 3 is set to any number not used by another Special I/O Unit. Switch 4

does not need to be set. Switch 5 is set to the right to designate no optical

links in the System. Switch 6, the termination resistance, is turned ON (to the

left). The other switches are set as shown below.

SW1 SW2

Unit 3

DIP Switch

SW1

Normal Allocation

Not used, turn OFF

Multilevel, level 1

64 I/O

refresh bits

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SECTION 5

System Installation

5-1 Mounting and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1-1 Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1-2 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Mounting and Connections

Section 5-1

5-1

Mounting and Connections

5-1-1

Mounting Location

C2000H Simplex System

The PC Link Unit may be mounted to any of the slots on the C2000H CPU

Rack.

C2000H Duplex System

C500 or C1000H System

The PC Link Unit may be mounted to any of the six slots on the Power Sup-

ply side (right side) of the I/O Rack connected to the CPU Rack.

On C500-BC082 or C500-BC052 Racks, the PC Link Unit may be mounted

to any of the five slots on the CPU side (right side) of the CPU Rack.

On C500-BC081 or C500-BC051 Racks, the PC Link Unit may be mounted

to any of the three slots on the CPU side (right side) of the CPU Rack.

C200H, C200HS, or

C200HX/HG/HE(-Z) System

The PC Link Unit can be mounted to any slot on the CPU Rack or an Expan-

sion I/O Rack connected under the CPU Rack except for the two rightmost

slots on the CPU Rack (those closest to the CPU). The PC Link Unit cannot

be mounted to a Slave Rack (a Rack that contains a Remote I/O Slave Unit)

or to an Expansion I/O Rack controlled through a Slave Rack.

5-1-2

Connections

Although connections made directly to the PC Link Units are generally

shielded twisted pair cable, the PC Link System can also contain optical links

between the Link Adapters (see 2-2 Using Link Adapters for details). The

System is thus either all electrical cable or a combination of electrical and

optical fiber cable.

Connectors are provided with the PC Link Units and the Link Adapters. All

cable must be purchases separately. Shielded twisted pair cable is recom-

mended.

Note that RS-485 interfaces (connectors) are used for the PC Link Units, but

RS-422 interfaces (connectors) are used for Link Adapters.

Electrical Cable Only

When only electrical cables are used, wiring is 2-conductor half duplex and

should be shielded twisted pair cable.

PC Link Unit

LK009-V1

PC Link Unit

LK009-V1

Link Adapter AL001

–

PC link Unit

LK009-V1

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Mounting and Connections

Section 5-1

Pin connections for Systems not using optical links are shown below. Twist

DB and DA together. The shield wire is connected only at one end of each

cable to prevent current flow. For cables connecting a PC Link Unit to a Link

Adapter, connect the shield wire to FG at the PC Link Unit connector (either

the connector hood, if it is metal, or pin #7 can be used). For cables connect-

ing two Link Adapters, connect the shield wire to pin #7 at either Link Adapter

connector, but not at both. Connector pin numbers and connector assembly

are described in following subsections.

PC Link Unit connector or

AL001 Link Adapter

Pin no. Signal name

Shielded twisted pair cable

Transfer data B (DB)

Frame ground (FG)

Transfer data B (DB)

Frame ground (FG)

Transfer date A (DA)

Frame ground (FG)

Transfer date A (DA)

Frame ground (FG)

Hood

Electrical and Optical Fiber Optical fiber cable is extremely effective in eliminating malfunctions caused

Cable

by noise sources near the connecting cables or by differences in the PC

ground impedances. It also increases the total cable length allowable in the

System. When optical fiber cable is used together with electrical cables, wir-

ing is 4-conductor simplex. Wire cable sections should be kept as short as

possible, preferably less than 10 meters each.

PC Link Unit

LK009-V1

Link Adapter

AL002(-P)

Link Adapter

AL004(-P)

–

Link Adapter

AL004(-P)

PC Link Unit

LK009-V1

Optical fiber

cable

Link Adapter

AL004(-P)

–

PC Link Unit

LK009-V1

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Mounting and Connections

Section 5-1

Pin connections for Systems using optical links are shown below. Twist SDB

with SDA; RDA with RDB. The shield wire is connected only at one end of

each cable to prevent current flow. For cables connecting a PC Link Unit to a

Link Adapter, connect the shield wire to FG at the PC Link Unit connector

(either the connector hood, if it is metal, or pin #7 can be used). Connector

pin numbers and connector assembly are described in following subsections.

See Section 2 Link Adapters for information on optical fiber cables.

PC Link Unit connector

AL004(-P) Link Adapter

Pin no. Signal name

Shielded twisted pair cable

Transfer data B (RDB)

Receive data B (RDB)

Send data B (SDB)

Receive data A (RDA)

Frame ground (FG)

Send data B (SDB

Receive data A (RDA)

Frame ground (FG)

Send date A (SDA)

Frame ground (FG)

Hood

Frame ground (FG)

Connector Pin Numbers

Connector pin numbers and cable-connector layout are shown below. Con-

nector assembly is described in a following subsection.

Connector

Housing

Maker

XM2A-0901

XM2S-0911

OMRON

Connectors

Pin no.

Cable (shielded twisted-pair

cable recommended)

Cable Lengths

Keep the length of the connecting cable between a Link Adapter and a

branched PC Link Unit to within 10 m. In Systems employing optical fiber ca-

ble between Link Adapter, the lengths of electrical cable should be made as

short as possible to take full advantage of the properties of the optical links. If

only electrical cable is used, the total length of all the cables on both main

and branch lines must not exceed 500 m.

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Mounting and Connections

Section 5-1

Wiring Cables

Use the following procedure to wire connectors.

Refer to the following diagrams as necessary.

Preparing to Connect

Shield Wire to FG

1, 2, 3... 1. Cut the cable to the required length.

2. Being careful not to damage the braiding underneath, use a razor blade

to cut away 25 mm of sheath.

3. Using scissors, cut away all but 10 mm of the exposed shield wire braid-

ing.

4. Using wire strippers, remove the covering from the last 5 mm of all

wires.

5. Fold the braiding back over the end of the sheath.

6. Wrap aluminum foil tape 1 1/2 turns over top of the braiding on top of

the sheath.

25 mm

10 mm

5 mm

Aluminum foil tape

Preparing for No Shield

Wire Connection to FG

Refer to the following diagrams as necessary.

1, 2, 3... 1. Cut the cable to the required length.

2. Being careful not to damage the braiding underneath, use a razor blade

to cut away 25 mm of sheath.

3. Using scissors, cut away all of the exposed shield wire braiding.

4. Using wire strippers, remove the covering from the last 5 mm of all

wires.

5. Wrap electrician’s tape over top of the end of the cut sheath.

25 mm

5 mm

Electrician’s

tape

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Dimensions

Section 5-2

Soldering

Observe the following when soldering wires onto the connector.

1, 2, 3... 1. Place heat-shrinking tubes onto all wires far enough from the end so as

to not interfere with soldering.

2. Presolder all wires and connector terminals.

3. Solder all wires, inserting 4 mm of the exposed 5 mm of wire into the

connector terminal.

4. Move the heat-shrinking tubes onto the soldered area and shrink them

into place.

Hood Assembly

Assemble the connector hood as shown the following diagram. See the con-

nection diagrams above to confirm whether one end is or is not to be con-

nected to the shield wire.

Aluminum foil tape

Hood (FG) connected

to shield wire

Hood (FG) not connected

to shield wire

5-2

Dimensions

C500-LK009-V1

Unit: mm

Backplane

250

100*

Approx.

150**

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Dimensions

Section 5-2

C500-LK401

117*

100

Backplane

130

Approx. 160**

*PC Link Unit and Base

**Including RS-485 Connector

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SECTION 6

Programming Considerations

6-1 Response Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-2 Reducing Response Time (C200H, C200HS, C200HX/HG/HE(-Z)) . . . . . . . . . . . . . . . . .

6-3 Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Response Times

Section 6-1

6-1

Response Times

The processing that determines and the methods for calculating maximum

and minimum response times from input to output are provided in this sub-

section. The following System and I/O program steps will be used in all ex-

amples below. This System contains eight PC Link Units.

Although more precise equations are possible if required, equations used for

the following calculations do not consider fractions of a scan.

In looking at the following timing charts, it is important to remember the se-

quence processing occurs during the PC scan, particular that inputs will not

produce programmed-actions until the program has been execution.

PC Link Unit

Unit 0

Unit 7

Output on PC

of Unit 7

Input on PC

of Unit 0

LR bit

Input

Output

Input

LR XXXX

Output

Note Noise may increase I/O delays.

C500 PCs

Minimum Response Time

The following illustrates the data flow that will produce the minimum re-

sponse time, i.e., the time that results when all signals and data transmis-

sions are processed as soon as they occur.

I/O refresh

Program executed.

Scan time

PC Link Unit servicing

PC with

Unit 0

Minimum transmission time

Buffer in Unit 0

PC Link Unit

transmissions

Buffer in Unit 7

Program executed.

PC with

Unit 7

Scan time

Input

Output

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Response Times

Section 6-1

The equation for minimum I/O response time is thus as follows:

Response time = input ON delay + scan time of PC of Unit 0 + minimum

transmission time + scan time of PC of Unit 7 + output ON

delay

Inserting the following values into this equation produces a minimum I/O re-

sponse time of 99 ms.

Input ON delay

1.5 ms

15 ms

20 ms

50 ms

Output ON delay

Scan time of PC of Unit 0

Scan time of PC of Unit 7

Minimum transmission time

12.5 ms (for 8 Units transferring 64 bits

each)

Maximum Response Time

The following diagram illustrates the data flow that will produce the maximum

response time. Delays occur because signals or data is received just after

they would be processed, because processing cannot be finished at one

time, or because data is sent during processing. In all cases, processing

must wait until the next scan/polling cycle.

First output to the buffer in the polling unit is delayed because all of the data

could not be loaded into the buffer at once. The polling delay is the result of

the LR data in its PC being updated immediately after the previous data was

sent to the buffer in the PC Link Unit, causing a delay until the next polling

cycle. One more polling cycle is then required before the data reaches the

buffer in PC Link Unit 7.

I/O refresh

PC Link Unit servicing

Output to buffer not completed.

Scan time

PC with

Unit 0

Buffer in

Unit 0

PC Link polling time

Polling delay

Induction sequence

processing time

PC Link

Unit trans-

missions

I/O refresh

Maximum

Transmis-

sion time

PC Link Unit servicing

Buffer in

Unit 7

PC with

Unit 7

Scan time

Input

Output

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Response Times

Section 6-1

The equation for maximum I/O response time is as follows:

Response time = input ON delay + (scan time of PC of Unit 0 x 3) + (PC Link

polling time x 2 + induction sequence processing time) +

(scan time of PC of Unit 7 x 2) + output ON delay

Inserting the same values plus the following values into this equation pro-

duces a maximum I/O response time of 236.5 ms.

PC Link polling time: 30 ms

Induction sequence processing time: 0 ms

C1000H and C2000H PCs

Minimum Response Time

Although the scan for C1000H and C2000H PCs is slightly different from that

for the C500 PC, the data flow that produces the minimum response time

between input and output and the equation for computing it are the same as

those shown for C500 PCs. Using the minimum transmission time of 12.5 ms

in the equation produces a minimum I/O response time of 99 ms.

Maximum Response Time

The following diagram illustrates the data flow that will produce the maximum

response time for a Single-level PC Link System. Delays occur because sig-

nals or data is received just after they would be processed or because data is

sent during processing. In either case, processing must wait until the next

scan/polling cycle.

The polling delay is the result of the LR data in its PC being updated immedi-

ately after the previous was sent to the buffer in the PC Link Unit, cause a

delay until the next polling cycle. One more polling cycle is then required be-

fore the data reaches the buffer in PC Link Unit 7.

Output refresh

PC Link Unit servicing

Scan time

PC with

Unit 0

Polling

delay

PC Link

polling time

Buffer in

Unit 0

Input re-

freshed

Induction sequence

processing time

PC Link

Unit trans-

missions

Output refresh

Program

executed.

Maximum

transmission

time

PC Link Unit

servicing

Buffer in

Unit 7

PC with

Unit 7

Scan time

Program

executed.

Input

Output

The equation for maximum I/O response time is thus as follows:

Response time = input ON delay + (scan time of PC of Unit 0 x 2) + (PC Link

polling time x 2 + induction sequence processing time) +

(scan time of PC of Unit 7 x 2) + output ON delay

Inserting the same values plus the following values into this equation and

again using the minimum transmission time produces a maximum I/O re-

sponse time of 336.5 ms.

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Response Times

Section 6-1

PC Link polling time: 30 ms

Induction sequence processing time: 120 ms

In a Multilevel PC Link System, the time required for the output may be

delayed one more scan at both Unit 0 and Unit 7. This is because PC Link

servicing is split into two parts in the PC scan, only one of which may be

serviced during any one scan depending on the time required for program

execution. Refer to the C1000H/C2000H Operation Manual for details.

C200H, C200HS, and C200HX/HG/HE(-Z) PCs

Minimum Response Time

The following illustrates the data flow that will produce the minimum re-

sponse time, i.e., the time that results when all signals and data transmis-

sions are processed as soon as they occur.

Program executed.

I/O refresh

Scan time

PC with

Unit 0

Minimum transmission time

Buffer in Unit 0

PC Link Unit trans-

missions

I/O refresh

Buffer in Unit 7

Program

executed.

PC with

Unit 7

Scan time

Input

Output

The equation for minimum I/O response time is thus as follows:

Response time = input ON delay + scan time of PC of Unit 0 + minimum

transmission time + (scan time of PC of Unit 7 x 2) + output

ON delay

Inserting the following values into this equation produces a minimum I/O re-

sponse time of 149.3 ms.

Input ON delay

1.5 ms

15 ms

20 ms

50 ms

Output ON delay

Scan time for PC of Unit 0

Scan time for PC of Unit 7

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Response Times

Section 6-1

Maximum Response Time

The following diagram illustrates the data flow that will produce the maximum

response time. Delays occur because signals or data is received just after

they would be processed or because data is sent during processing. In either

case, processing must wait until the next scan/polling cycle.

First output to the buffer in the polling unit is delayed by the setting of the

number of LR bits to be refreshed each scan. A similar delay is present when

the LR data reaches Unit 7. The polling delay is the result of the LR data in

its PC being updated immediately after the previous was sent to the buffer in

the PC Link Unit, cause a delay until the next polling cycle. One more polling

cycle is then required before the data reaches the buffer in PC Link Unit 7.

I/O refresh

Scan time

PC with

Unit 0

PC Link

polling time

Buffer in Unit 0

Polling delay

Induction sequence

processing time

PC Link Unit

transmissions

Maximum

transmission

time

Buffer in Unit 7

PC with

Unit 7

Scan time

Input

Output

The equation for maximum I/O response time is thus as follows:

Response time = input ON delay + [scan time of PC of Unit 0 x (number of

LR transfer bits ÷ I/O refresh bits)] + alpha + (PC Link poll-

ing time + induction sequence processing time) + {scan

time of PC of Unit 7 x [(number of LR transfer bits ÷ I/O

refresh bits) x 2 + 1]} + beta + output ON delay

If scan time of PC of Unit 0 > PC Link polling time, alpha = scan time of PC of

Unit 0. If scan time of PC of Unit 0 < PC Link polling time, alpha = PC Link

polling time.

If scan time of PC of Unit 7 > PC Link polling time, beta = scan time of PC of

Unit 7. If scan time of PC of Unit 7 < PC Link polling time, beta = PC Link

polling time.

Inserting the following values into this equation produces a maximum I/O re-

sponse time of 661.3 ms.

I/O refresh bits for Unit 0

I/O refresh bits for Unit 7

256

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Reducing Response Time (C200H, C200HS, C200HX/HG/HE/(-Z))

Section 6-2

6-2

Reducing Response Time (C200H, C200HS,

C200HX/HG/HE(-Z))

IORF(97) can be used in programming to shorten the I/O response time

greater than is possible by setting a high number of refresh bits. (Remember,

increasing the number of refresh bits set on the back-panel LED shortens

response time, but increases the scan time of the PC.) The following calcula-

tions for the maximum scan time use the same example System configura-

tion as that used in 6-1 Response Times. In programming the PCs for PC

Link Units #0 and #7, IORF(97) is executed during every PC scan for the PC

Link Units. The basic equation for the maximum I/O response time is as fol-

lows:

Response time = input ON delay + [scan time of PC of Unit 0 x (number of

LR transfer bits ÷ number of I/O refresh bits ÷ 2)] + alpha +

PC Link scan time + invitation sequence processing time +

{scan time of PC of Unit 7 x [(number of LR transfer bits ÷

number of I/O refresh bits ÷ 2) x 2 + 1]} + beta + output ON

delay

If scan time of PC of Unit 0 > PC Link scan time, alpha = scan time of PC of

Unit 0. If scan time of PC of Unit 0 < PC Link scan time, alpha = PC Link

scan time.

If scan time of PC of Unit 7 > PC Link scan time, beta = scan time of PC of

Unit 7. If scan time of PC of Unit 7 < PC Link scan time, beta = PC Link scan

time.

The required data from the example System configuration is as follows:

Input ON delay

1.5 ms

15 ms

Output ON delay

Scan time of PC of Unit 0

20 ms + 5.7 ms = 25.7

(required for IORF execution)

Scan time of PC of Unit 7

50 ms + 5.7 ms = 55.7

(required for IORF execution)

Number of PC Link Units

Number of LR bits

1,024

256

Number of refresh bits for Unit 0

Number of refresh bits for Unit 7

PC Link scan time

256

32.4 ms

Invitation sequence processing time 0 ms

Placing these values into the equation produces a maximum I/O response

time of 466.9 ms, approximately 200 ms shorter than that obtained for the

same I/O example in 6-1 Response Times.

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Programming Examples

Section 6-3

6-3

Programming Examples

This example explains the programming required to start the entire Control

System shown below only after all “preparation-completed flags” are turned

ON for both Subsystems. Using the following programming, any PC that is

not in RUN mode will be ignored and operations will continue for the other

PCs. The program is designed to start the System only if none of the PCs is

already running. The Control System consists of 15 PCs and 16

C500-LK009-V1 PC Link Units using 32 transfer bits each. Both polling units

are mounted to a C1000H PC. All other PC Link Units are mounted to C500

PCs in two Subsystems each consisting of seven PC Link Units.

C1000H PCs

Unit 0

C500 PCs

Unit 1

Unit 0

Unit 2

Unit 3

Unit 4

Unit 5

Unit 6

Unit 7

Level 0

C500 PCs

Unit 1

Level 1

C1000H Write Bits

C500 Write Bits

LR 0000

LR 3200

LR 0001

Level 0 START command bit

Level 1 START command bit

Preparation-completed flag for Units #0, level 0 and level 1

LR 0201

LR 0401

LR 0601

LR 0801

LR 1001

LR 1201

LR 1401

LR 1801

LR 2001

LR 2201

LR 2401

LR 2601

LR 2801

LR 3001

Preparation-completed flag for Unit #1, level 0

Preparation-completed flag for Unit #2, level 0

Preparation-completed flag for Unit #3, level 0

Preparation-completed flag for Unit #4, level 0

Preparation-completed flag for Unit #5, level 0

Preparation-completed flag for Unit #6, level 0

Preparation-completed flag for Unit #7, level 0

Preparation-completed flag for Unit #1, level 1

Preparation-completed flag for Unit #2, level 1

Preparation-completed flag for Unit #3, level 1

Preparation-completed flag for Unit #4, level 1

Preparation-completed flag for Unit #5, level 1

Preparation-completed flag for Unit #6, level 1

Preparation-completed flag for Unit #7, level 1

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Programming Examples

Section 6-3

LR Area Allocations

C1000H PC

Level 0 C500 PCs

Unit 0 LR 00 & LR 01

Unit 1 LR 02 & LR 03

Unit 2 LR 04 & LR 05

Unit 3 LR 06 & LR 07

Unit 4 LR 08 & LR 09

Unit 5 LR 10 & LR 11

Unit 6 LR 12 & LR 13

Unit 7 LR 14 & LR 15

Unit 0 LR 00 & LR 01

Unit 1 LR 02 & LR 03

Unit 2 LR 04 & LR 05

Unit 3 LR 06 & LR 07

Unit 4 LR 08 & LR 09

Unit 5 LR 10 & LR 11

Unit 6 LR 12 & LR 13

Unit 7 LR 14 & LR 15

Level 0

Work bits LR 16 & LR 31

Unit 0 LR 32 & LR 33

Unit 1 LR 34 & LR 35

Unit 2 LR 36 & LR 37

Unit 3 LR 38 & LR 39

Unit 4 LR 40 & LR 41

Unit 5 LR 42 & LR 43

Unit 6 LR 44 & LR 45

Unit 7 LR 46 & LR 47

Level 1 C500 PCs

Work bits LR 00 & LR 15

Unit 0 LR 16 & LR 17

Unit 1 LR 18 & LR 19

Unit 2 LR 20 & LR 21

Unit 3 LR 22 & LR 23

Unit 4 LR 24 & LR 25

Unit 5 LR 26 & LR 27

Unit 6 LR 28 & LR 29

Unit 7 LR 30 & LR 31

Level 1

Work bits LR 48 & LR 63

Program

PC RUN flags (24800 through 24807 and 25000 through 25007) are used in

programming the PC with Units #0. They are ON when the PC is operational.

Units #0 (Levels 0 and 1)

Preparations completed flag

LR 0001

LR 0000

LR 3200

LR 0001 LR 0201 LR 0401

LR 1401 LR 3401 LR 3601

LR 4601

24807

25001

25002

25007

24801 24802

LR 0000

Unit 0 operations

started

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Programming Examples

Section 6-3

Unit 1, Level 0

Preparations completed flag

LR 0201

LR 0000

Unit 1 operations

started

Unit 1, Level 1

Preparations completed flag

LR 1801

LR 1600

Unit 1 operations

started

Unit 7, Level 0

Preparations completed flag

LR 1401

LR 0000

Unit 7 operations

started

Unit 7, Level 1

Preparations completed flag

LR 3001

LR 1600

Unit 7 operations

started

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Programming Examples

Section 6-3

System Configuration 2

This example is for a System with three Subsystems consisting of a C1000H

PC, a C2000H PC, thirteen C500 PCs, and a C200H PC as shown below.

Programming on the following pages shows the necessary steps for transfer-

ring data through the transfer PCs. Not all PCs in the System are described.

(A)

C1000H PC

(B)

C2000H PC

C500 PC

Unit 7

C500 PC

Unit 6

C500 PC

Unit 1

C500 PC C500 PC

Unit 1 Unit 2

C500 PC

Unit 6

C200H PC

Unit 7

Unit 0 Unit 0

Unit 1 Unit 0

Level 0

Level 1

Level 0

LR Area Allocations

All words below are shown with the Unit that writes to them.

C500 PC

Unit 7

C500 PC

Unit 6

C500 PC

Unit 1

C1000H PC

C2000H PC

C500 PC

Unit 1

C500 PC

Unit 2

C500 PC

Unit 6

C200H PC

Unit 7

LR 00 &

LR 01

LR 00 &

LR 01

Unit 0,

level 0

Unit 0,

level 0

LR 02 &

LR 03

LR 02 &

LR 03

LR 04 &

LR 05

LR 12 &

LR 13

LR 12 &

LR 13

LR 14 &

LR 15

LR 14 &

LR 15

LR 32 to

LR 47

Unit 0,

level 1

LR 48 to

LR 63

Unit 1,

level 1

Note The C200H could be replaced by the C200HS and C200HX/HG/HE(-Z) with-

out any changes in this example.

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Programming Examples

Section 6-3

Programming Example 1

Using the above System, the following programming, which is started by

turning ON input 0000 in PC (D), will move the contents of DM 0100 from PC

when PC (D) sends a START signal is sent to PC (B). This signal is trans-

ferred across the PCs to PC (C) (at the extreme left in the table below) and

then the transfer of data is instigated from PC (C) to PC (D) (right to left in

the table below.)

PC (C) Programming

PC (A) Programming

PC (B) Programming

PC (D) Programming

Start input

LR 0100

MOV(21)

LR 5000

LR 1400

0000

0100

5000

1400

DM 0100

LR 14

LR 1500

MOV(21)

LR 3600

MOV(21)

LR 0015

MOV(21)

LR 14

LR 35

LR 01

1500

DM 0000

3600

0015

Contents of DM 0100 is

transferred to LR 14 and the

Completed flag, LR 1500

(defined by the program-

mer), is turned ON when LR

0100 (written by PC(A))

turns ON.

A START signal is sent to PC

PC (B)) turns ON. When

transfer of DM 0100 data has

been completed at PC (C),

the contents of LR 14 is

transferred to LR 35 and the

Completed flag, LR 3600, is

turned ON.

A START signal is sent to PC

(A) when LR 1400 (written by

PC (D)) turns ON. When

transfer of LR 14 data to LR

35 has been completed at PC

(A), the contents of LR 35 is

transferred to LR 01 and the

Completed flag, LR 0015, is

turned ON.

A START signal is sent to PC

(B) when input 0000 turns

ON. When transfer of LR 35

data to LR 01 has been com-

pleted at PC (B), the contents

of LR 01 is transferred to DM

0000.

0000 ON

LR 1400 ON

LR 5000 ON

LR 1400 ON

LR 5000 ON

LR 0100 ON

DM 0100→LR 14

LR 1500 ON

^{LR 14}→LR 35

LR 3600 ON

^{LR 35}→LR 01

LR 0015 ON

^{LR 01}→DM 000

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Programming Examples

Section 6-3

Programming Example 2

Using the above System, the following programming, which is started by start

input 0000 in PC (A), will compare the contents of DM 0200 in PCs (C) and

(D) and output an alarm signal if the contents differ.

PC (C) Programming

PC (A) Programming

PC (B) Programming

PC (D) Programming

Start input

00000

LR 3200

0000

LR 0000

MOV(21)

LR 1500

MOV(21)

LR 0000

MOV(21)

3200

DM 0200

LR 14

LR 48

DM 0200

LR 14

LR 1500 LR 4900

CMP(20)

1500

4900

1500

LR 14

LR 48

Equal flags

25506

01000

Alarm output

Input 0000 ON

LR 0000 ON

LR 3200 ON

LR 0000 ON

DM 0200→LR 14

LR 3200 ON

LR 0000 ON

DM 0200→LR 14

LR 1500 ON

^{LR 14}→LR 48

LR 4900 ON

LR 1500 ON

LR 1500

LR 4900

LR 14≠LR 48

YES

Alarm output 01000 ON

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SECTION 7

Error Processing

The PC Link Units provide various means of monitoring systems operation and resolving errors when they occur. These

include LED indications, PC RUN and Error Flags, and, for C200H, C200HS, and C200HX/HG/HE(-Z) systems, Special

I/O Unit Error Flags and Restart Bits.

7-1 SR Area Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7-2 Error Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7-3 Error Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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SR Area Flags

Section 7-1

7-1

SR Area Flags

PC RUN and Error Flags

PC RUN Flags can be read to determine the operational status of each PC to

which a PC Link Unit is mounted. All PCs are operational when their PC RUN

Flag is ON.

If there is a transfer error or a power failure for any PC Link Unit, the Error

Flag for that Unit will turn ON, and an error message will be sent. When the

error is removed (the power comes on or transfer preparation is completed)

the Error Flag will go OFF. An error in Unit 0 stops all data transfer, but an

error in another Unit only stops that Unit’s communication. LR bit status is

maintained whenever communication stops for one or more Units. Error

Flags will not turn ON for FALS(07) instructions; use the PC RUN Flags. The

following tables show the unit number for Single-level Systems (top line) and

the unit number followed by the level for Multilevel Systems (bottom line).

C200H, C200HS, C200HX/HG/HE(-Z), C1000H, and C2000H PCs

Bit

Bit 8 Bit 7

Bit 0

247

#31

#30

#29

#28

#27

#26

#25

#24

#8,1

#31

#30

#29

#28

#27

#26

#25

#24

#8,1

#15,1 #14,1 #13,1 #12,1 #11,1 #10,1 #9,1

248

#23

#7,1

#22

#6,1

#21

#5,1

#20

#4,1

#19

#3,1

#18

#2,1

#17

#1,1

#16

#0,1

#23

#7,1

#22

#6,1

#21

#5,1

#20

#4,1

#19

#3,1

#18

#2,1

#17

#1,1

#16

#0,1

249

#15

#14

#13

#12

#11

#10

#8,0

#15

#14

#13

#12

#11

#10

#8,0

#15,0 #14,0 #13,0 #12,0 #11,0 #10,0 #9,0

250

#7,0

#6,0

#5,0

#4,0

#3,0

#2,0

#1,0

#0,0

#7,0

#6,0

#5,0

#4,0

#3,0

#2,0

#1,0

#0,0

Error Flags

PC RUN Flags

C500 PCs

Bit

Bit 8 Bit 7

Bit 0

#7,1

#6,1

#5,1

#4,1

#3,1

#2,1

#1,1

#0,1

#7,1

#6,1

#5,1

#4,1

#3,1

#2,1

#1,1

#0,1

#7,0

#6,0

#5,0

#4,0

#3,0

#2,0

#1,0

#0,0

#7,0

#6,0

#5,0

#4,0

#3,0

#2,0

#1,0

#0,0

Error Flags

PC RUN Flags

Level Flags

AR area flags that indicate the type of System and level of the Subsystem of

the PC Link Unit mounted to the PC are also provided for C200H, C200HS,

C200HX/HG/HE(-Z), C1000H, and C2000H PCs. AR bit 2411 will be ON if a

level 1 PC Link Unit in a Multilevel System is mounted to the PC.

AR bit 2412 will be ON if a level 0 PC Link Unit in a Multilevel System or a

PC Link Unit in a Single-level System is mounted to the PC.

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SR Area Flags

Section 7-1

Special I/O Unit Restart Bits Because the C200H-LK401 is treated as a Special I/O Unit, Special I/O Unit

and Error Flags

(C200H, C200HS,

C200HX/HG/HE(-Z))

Restart Bits and Error Flags are effective for it. An Error Flag turns ON when

the same Special I/O Unit unit number is assigned to more than one Unit or

when an error has occurred in the refresh cycle between the PC and the

Special I/O Unit with the designated unit number. This unit number is dif-

ferent than and set independently from the PC Link Unit’s unit number.

When an error occurs in any Special I/O Unit, SR bit 25415 will also turn ON.

Restart Bits can be used to restart a Special I/O Unit to clear an error or to

change switch settings by turning the flag bit OFF, and then back ON, either

through programming or through the Programming Console. The restart op-

eration starts the PC Link Unit from the same initial step as if the power were

just turned on, and will turn ON the Error Flag for that Unit at the PC of other

Special I/O Units. If the PC Link Unit still does not function properly, turn off

the power to the PC, then turn it on again. Error Flags and Restart Bit are

refreshed every PC scan.

Word

Bit

Function

AR 00

Error Flag for Special I/O Unit #0

Error Flag for Special I/O Unit #1

Error Flag for Special I/O Unit #2

Error Flag for Special I/O Unit #3

Error Flag for Special I/O Unit #4

Error Flag for Special I/O Unit #5

Error Flag for Special I/O Unit #6

Error Flag for Special I/O Unit #7

Error Flag for Special I/O Unit #8

Error Flag for Special I/O Unit #9

Restart Bit for Special I/O Unit #0

Restart Bit for Special I/O Unit #1

Restart Bit for Special I/O Unit #2

Restart Bit for Special I/O Unit #3

Restart Bit for Special I/O Unit #4

Restart Bit for Special I/O Unit #5

Restart Bit for Special I/O Unit #6

Restart Bit for Special I/O Unit #7

Restart Bit for Special I/O Unit #8

Restart Bit for Special I/O Unit #9

AR 01

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Error Examples

Section 7-2

7-2

Error Examples

Error conditions are indicated by the LEDs as described below.

Note Some errors in switch settings (e.g., setting the same unit number for more

than on PC Link Unit) will not result in an error display, but will cause LR area

data to be in error.

LK009

LK401

MEANING

Indicates all PC Link Units in this operating level are

exchanging data normally.

Indicates data exchange is not occurring with any other

PC Link Unit.

Only possible on the polling unit: indicates that none of

the PC Link Units are capable of data exchange.

Indicates an error exists in another PC Link Unit that is

not the polling unit.

Indicates an error exists between this Unit and the polling

unit.

Indicates setting of PC Link Unit numbers is wrong.

Note: Open circles indicate lit LEDs. Half-back circles indicate flashing LEDs.

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Error Examples

Section 7-2

System Configuration

This example will describe error indications on all PC Link Units using the

following System configuration. Transmission line breaks will be described at

two different points, A and B. Unit 3 has been set for double allocation, and

thus is allocated the LR bits and flags from both Unit 3 and Unit 4.

Double allocation

C2000H PC

C500 PC

Unit 1

C500 PC

Unit 2

C200H PC

Unit 5

Unit 0,

(polling unit)

Unit 3

(B)

(A)

Note The C200H could be replaced by the C200HS and C200HX/HG/HE(-Z) with-

out any changes in this example.

Break at Point A

Because Unit 0 receives no response from Units 1, 2, 3, and 5 it indicates an

error for all of them. Because Units 1, 2, 3, and 5 receive no polling signal

from Unit 0, they each indicate an error for it. LED indications are shown be-

low, as well as the conditions of the PC RUN and Error Flags in the SR area.

Unit 0 (C2000H PC)

Display pattern A

Display pattern B

Allocated to Unit 3.

Bit 15

Bit 0

Word 250

Error Flags ON

for Units 1 to 5

PCs operative

for all Units

Error Flag OFF

for Unit 0

Units 1 and 2 (C500 PC)

Display pattern A

Display pattern B

Allocated to Unit 3.

Bit 15

Bit 0

Word 62

Error Flags OFF for

Units 1 to 5

PCs operative

for all Units

Error Flag ON for

Unit 0

Units 3 and 5 (C200H PC)

Allocated to Unit 3.

Bit 15

Bit 0

Word 250

Error Flags OFF

for Units 1 to 5.

PCs operative

for all Units.

Error Flag ON for

Unit 0.

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Error Examples

Section 7-2

Break at Point B

Because Unit 0 receives no response from Unit 1 only, it indicates an error

for it, and normal conditions for Units 2 and 3. Since Unit 1 receives no poll-

ing signal from Unit 0, it indicates an error for Unit 0. Units 2, 3, and 5 receive

signals from each other and indicate normal conditions other than an error for

Unit 1. LED indications are shown below, as well as the conditions of the PC

RUN and Error Flags in the SR area.

Unit 0 (C2000H PC)

Display pattern A

Display pattern B

Allocated to Unit 3.

Bit 15

Bit 0

Word 250

Error Flags OFF

for Units 2 to 5.

PCs operative

for all Units.

Error Flag OFF

for Unit 0.

Error Flag ON for

Unit 1.

Unit 1 (C500 PC)

Display pattern A

Display pattern B

Allocated to Unit 3.

Bit 15

Bit 0

Word 62

Error Flags OFF

for Units 1 to 5.

PCs operative

for all Units.

Error Flag ON for

Unit 0.

Unit 2 (C500 PC)

Display pattern A

Display pattern B

Allocated to Unit 3.

Bit 15

Bit 0

Word 62

Error Flags OFF

for Units 2 to 5.

PCs operative

for all Units.

Error Flag

OFF for Unit 0.

Error Flag ON for

Unit 1.

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Error Tables

Section 7-3

Units 3 and 5 (C200H PC)

Allocated to Unit 3.

Bit 15

Bit 0

Word 250

Error Flags OFF

for Units 2 and 5.

PCs operative

for all Units.

Error Flag OFF

for Unit 0.

Error Flag ON for

Unit 1.

Note The C200H could be replaced by the C200HS and C200HX/HG/HE(-Z) with-

out any changes in this example.

7-3

Error Tables

C500, C1000H, and C2000H PCs

Error Unit #0 PC

CPU error down (line

broken or

Unit #0

Unit #1

cable

problem

Unit #0

cable

problem

Unit #n

cable

problem

Error in

data

reception broken or

Unit #n

down (line

Unit #n

PC CPU

error

watchdog (missing

(missing

from Unit watchdog

timer

error)

or broken) or broken) or broken)

timer

error)

Condition

Unit #0

At startup

Link not established

---

During op- PC RUN All LEDs All

Error Error Flags for Unit #n ON. LED for Unit PC RUN

eration

Flag OFF not lit (link Flags OFF #n flashing (link with Unit #n broken). Flag

for

for Unit #0. broken).

but that for

#0. All

LEDs but

Unit

OFF (pre-

vious data

retained).

LINK

flashing.

At startup

Link not established

---

Units oth- During op- PC RUN Error Flags for Unit #0 Error Flags Error Flags Error Flags PC RUN

er than #0 eration

and #n

Flag OFF ON. LED for Unit #0 for Unit #n for

for Unit #0. flashing (link broken). ON. LED Unit ON. ON. LED Unit

“this” for Unit #n Flag

for

for Unit #n “THIS

for Unit #n OFF (pre-

flashing

(previous

LINK” LED flashing vious data

flashing

(previous

retained).

data

re- (previous

data

re-

tained for data

re- tained for

Unit #n).

---

tained for Unit #n).

Unit #n).

At startup

Link not established

Unit #n

During op- PC RUN Error Flags for Unit #0 Error Flags ---

eration Flag OFF ON. LED for Unit #0 for Unit #0

All LEDs Frozen

not lit.

for Unit #0 flashing (link broken).

(previous

ON. LED

for Unit #0

flashing

data

re-

tained for

Unit #0)

(previous

data

re-

tained for

Unit #0).

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Error Tables

Section 7-3

C200H, C200HS, and C200HX/HG/HE(-Z) PCs

Error Unit #0 PC

CPU error

Unit #0

Special

I/O Unit

error

Unit #1

cable

problem

Unit #0

cable

problem

Unit #n

cable

problem

Error in

data

reception

from Unit

Unit #n

PC CPU

error

Unit #n

Special

I/O Unit

error

(missing

or broken) or broken) or broken)

Condition

At startup

Link not established

---

Error Error Flags for Unit #n ON. OTHER LED not lit; ER-

not lit (link 25415 ON; Flags OFF ROR LED flashing (link with Unit #n broken).

Unit #0

During op- All LEDs SR

eration

bit All

broken).

RUN LED but that for

not lit (link #0. “OTH-

broken).

ER” LED

not lit; ER-

ROR LED

flashing.

(error for all

polled

Units).

At startup

Link not established

---

Units oth- During op- Error Flags for Unit #0 ON. LED not lit; Error Flags Error Flags Error Flags for Unit #n

er than #0 eration

and #n

ERROR LED flashing (link broken).

for Unit #n for

ON.OTH- Unit ON; lit; ERROR LED flashing.

ER LED “THIS

“this” ON; “OTHER” LED not

not lit; ER- LINK” LED

ROR LED not lit; ER-

flashing.

ROR LED

flashing

(link with

“this” Unit

broken).

At startup

Link not established

---

Unit #n

During op- Error Flags for Unit #0 ON. “LINK 0” Error Flags ---

eration and “OTHER” LEDs not lit; ERROR for Unit #n

All LEDs “RUN” LED

not lit.

not lit(link

with Unit #n

broken).

LED flashing.

ON; “LINK

0” LED not

lit; ERROR

LED flash-

ing.

General Errors

Error

Possible cause

PC power OFF

Correction

LED does not light

Turn

power

ON.

PC Link Unit loose.

Tighten mounting screws.

Unit no./number of transfer

points settings not matched

properly.

Reset Unit no. and/or number of

transfer points.

LED does not light

properly

PC Link Unit display pattern set- Readjust display pattern setting.

ting wrong.

Poor cable connections.

Check cables, screws and con-

nectors.

Data not being trans-

ferred properly

Mode selector not adjusted prop- Check mode selector setting.

erly.

Same unit no. set for two differ-

ent Units.

Check unit no. settings.

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Error Tables

Section 7-3

Error List for Special I/O

Units (C200H, C200HS,

C200HX/HG/HE(-Z))

Because the C200H-LK401 is treated as a Special I/O Unit, the following er-

rors, Error Flags, and Restart Bits are used with it.

Error

Causes and status

Correction

Waiting for Special I/O Special I/O Unit has a hardware mal-

Unit start-up. function. PC will not begin operation.

Replace the abnormal Special I/O Unit with a

new Unit. (Abnormal Unit displays only $s

when I/O table is read.)

Too many Special I/O Same unit number has been assigned Set unit numbers so that each is used only

Units.

to more than one Special I/O Unit. PC once. (Unit numbers can be accessed by read-

will not begin operation. SR bit 25415 ing the I/O table.)

is ON.

Error in Special I/O

Unit.

Refreshing was not normally executed Obtain abnormal unit number by reading

between CPU and the Special I/O

Unit. Only the abnormal Unit will stop

operation. SR bit 25415 is ON.

AR 0000 to AR 0009, remove the cause of the

error, and then restart by turning on and then

off the appropriate Restart Bit (AR 0100 to

AR 0109). If the Unit does not recover normal

operation after restarting, replace it with a new

one.

Error Flags

The following Error Flags will turn ON when the same unit number is as-

signed to more than one Special I/O Unit, or when the refreshing operation

between the PC and the Special I/O Unit is not normally executed.

(C200H, C200HS,

C200HX/HG/HE(-Z))

Bit

AR0000

Unit number

AR0001

AR0002

AR0003

AR0004

AR0005

AR0006

AR0007

AR0008

AR0009

Restart Bits

(C200H, C200HS,

C200HX/HG/HE(-Z))

The following Restart Bits are turned on, and then back off again to restart

Special I/O Units. It is not necessary to turn off Unit power when its Restart

Bit is used.

Bit

AR0100

Unit number

AR0101

AR0102

AR0103

AR0104

AR0105

AR0106

AR0107

AR0108

AR0109

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SECTION 8

Inspection and Maintenance

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Inspection and Maintenance

Section 8

PC Link Units should be inspected regularly at the same time as the PCs to

which they are attached. The following three areas should be given special

attention.

Item

Description

Ambient conditions

Temperature: 0° to 55°C

Humidity: 35% to 85%

Dust-free

Proper attachment PC Link Unit attached firmly?

Connectors and cables firm?

No breaking cables?

Others

If Link Adapters* are used, is power supply stable and within

appropriate limits?

If optical fiber cable is used, is it kinked (limit: 15-mm-radius

bends)?

If there is a problem, follow the following steps.

1, 2, 3... 1. Always turn the power off before attaching or removing a PC Link Unit.

2. If there is a poor connection, dip a soft, clean cotton cloth in indus-

trial-grade alcohol and wipe the connectors with it. Then remove any

threads left by the cloth, and reattach the PC Link Unit.

3. It is best to keep an extra PC Link Unit on hand to use as a replacement

if one stops operating.

4. If a PC Link Unit does not operate properly, replace it with a new one,

and test the new one immediately.

5. When returning an old PC Link Unit for repair, include a description of

the exact problems and symptoms.

6. The PC Link Unit is designed so that parts replacement is unnecessary.

However, it may be necessary to replace a fuse in a Link Adapter if used

(3G2A9-AL002-E or 3G2A9-AL004-E). The 3G2A9- AL002-E requires a

0.1-A, 250-V fuse, and the 3G2A9-AL004-E, a 0.3-A, 250-V fuse.

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Appendix A

Standard Models

This chart shows the standard models of the products that are available for use with PC Link Units.

Product

PC Link Unit

Specifications

Model number

For use with C500, C500F, C1000H, C2000, and

C2000H PCs. Multilevel System possible. Includes one

RS485 connector and connector cover.

C500-LK009-V1

For use with C200H, C200HS, and C200HX/HG/HE(-Z) PCs.

Multilevel System possible.

C200H-LK401

Includes one RS485 connector and connector cover.

Optical (APF/PCF) (3 connectors)

Link Adapter

3G2A9-AL002-PE

3G2A9-AL001-PE

3G2A9-AL005-PE

3G2A9-AL006-PE

3G2A9-AL001

Optical (APF/PCF), RS-422, RS-232C (1 connector each)

Optical (APF/PCF), (AGF) (1 connector each)

Optical (APF/PCF) (1 connector), (AGF) (2 connectors)

RS-422 (3 connectors)

Optical (PCF) (3 connectors)

3G2A9-AL002-E

3G2A9-AL001-E

3G2A9-AL005-E

3G2A9-AL006-E

Optical (PCF), RS-422, RS-232 (1 connector each)

Optical (PCF), optical (AGF) (1 connector each)

Optical (PCF) (1 connector), (AGF) (2 connectors)

Cables and Connectors

Cable to connect PC Link Units to each other or to Link Adapters must be purchased by the user. OMRON

does not supply it. The following cable is recommended. The Connector is produced by OMRON.

Cable

CO-HC-ESV-3P x 7/0.2

XM2A-0901

Connector

Housing

Maker

XM2S-0911

OMRON

All Plastic Optical Fiber Cable

Model numbers with the suffix -P can be connected to up to 20 m of APF cable.

Product

Specifications

Cable only (w/o connector)

Model number

Plastic optical fiber cable

B500-PF002

Order in multiples of 5 m from 5 to 100 m, or in lengths

of 200 m or 500 m

Optical connector A

Optical connector B

W/2 optical connectors (brown)

For plastic optical fiber cable 10 m long or shorter

3G5A2-CO001

3G5A2-CO002

W/2 optical connectors (black)

For plastic optical fiber cable 8 to 20 m long

Plastic optical fiber set

Optical connector puller

1 m cable with connector A attached to both ends

Purchase separately

3G5A2-PF101

---

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Standard Models

Appendix A

Plastic-clad Optical Fiber Cable

Model numbers with the suffix -P can be connected to up to 200 m of PCF cable.

Product

Description

Operating temperature

–10° to 70° C

Model number

3G5A2-OF011

3G5A2-OF101

3G5A2-OF201

3G5A2-OF301

3G5A2-OF501

3G5A2-OF111

3G5A2-OF211

3G5A2-OF311

3G5A2-OF411

3G5A2-OF511

Optical fiber cable (indoor)

.1 m, w/ connector

1 m, w/ connector

2 m, w/ connector

3 m, w/ connector

5 m, w/ connector

10 m, w/ connector

20 m, w/ connector

30 m, w/ connector

40 m, w/ connector

50 m, w/ connector

Optical fiber cable (indoor/

outdoor)

10 to 500 m, w/ connector (order

in multiples of 1 m)

Operating temperature –10° to 3G5A2-OF002

70° C

510 to 800 m, w/ connector (order Operating temperature 0° to

in multiples of 1 m)

55°C (Do not expose to direct

sunlight.)

Note: Because optical fiber cable cannot be spliced as easily as ordinary cables when cut or extended, be

sure to order an adequate length. The cable length does not include connectors.

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Appendix B

Specifications

Item

Specification

Communication method

Sync

2-conductor, half duplex or 4-conductor, half duplex (if optical links are included.)

HDLC

Transmission speed

Transmission method

Transmission distance

128 kbps

Broad scanning

500 m (total cable length in

System without optical links, including branch lines)

Possible no. of PC Link

Units per System

PC of polling unit

Single-level

Multilevel

C200H, C200HS, C200HX/HG/HE(-Z),

C1000H, or C2000H

C500 or C500F

Transmission LR bits

No. of PC Link Units PC of polling unit

3–4

5–8

9–16 17–32

C200H, C200HS, C200HX/HG/HE(-Z),

C1000H, or C2000H

512

256

128

C500 or C500F

256

128

---

Transmission time

Diagnostic functions

Interface

35 ms max. (for 128 bits with 8 PC Link Units)

CPU watchdog timer, CRC transmission error check

RS-485

Cable used

Shielded twisted pair (C0-HC-ESV-3P x 7/0.2)

C500-LK009-V1

---

C200H-LK401

0.25 A max. at 5 VDC

400 g max.

Current consumption

Weight

0.9 A max. at 5 VDC

800 g max.

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Glossary

Backplane

A base to which Units are mounted to form a Rack. Backplanes provide a

series of connectors for these Units along with wiring to connect them to the

CPU. Backplanes also provide connectors used to connect them to other

Backplanes. In some Systems, different Backplanes are used for different

Racks; in other Systems, Racks differ only by the Units mounted to them.

basic Link System

branch line

A control system that includes only one of the following systems: Remote I/O

System, PC Link System, Host Link System, or Net Link System.

A communications line leading from a Link Adapter to any but the terminators

in a Link System.

Branching Link Adapter

A Link Adapter used to branch connections to Units in a Link System. Used

either to prevent the entire System from shutting down for an interruption at

only one point in the System or to enable connecting more than two Units in

one System when each Unit supports only one connector.

buffer

A temporary storage space for data in a computerized device.

building-block PC

A PC that is constructed from individual components, or “building blocks.”

With building-block PCs, there is no one Unit that is independently identifi-

able as a PC. The PC is rather a functional assembly of components.

combined Link System

common data areas

A control system that includes more than one of the following systems: Re-

mote I/O System, PC Link System, Host Link System, or Net Link System.

LR data areas in separate PCs whose contents are kept the same. Each PC

writes data to certain LR area words, and then transfers this data to the same

LR area words in the other PCs that have a PC Link Unit connected in series

with it. Common data areas are created in PC Link Systems

Control System

All of the hardware and software components used to control other devices.

A Control System includes the PC System, the PC programs, and all I/O de-

vices that are used to control or obtain feedback from the controlled system.

controlled system

The devices that are being controlled by a PC System.

Converting Link Adapter

A Link Adapter used to convert between different types of optical fiber cable,

different types of wire cable, or between optical fiber cable and wire cable.

Such conversion is necessary to connect Units that use different forms of

communication.

CPU

An acronym for central processing unit. In a PC System, the CPU executes

the program, processes I/O signals, communicates with external devices,

etc.

CPU Backplane

CPU Rack

A Backplane used to create a CPU Rack.

Part of a building-block PC, the CPU Rack contains the CPU, a Power Sup-

ply, and other Units. With most PCs, the CPU Rack is the only Rack that pro-

vides linkable slots.

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Glossary

data area

An area in the PC’s memory that is designed to hold a specific type of data,

e.g., the LR area is designed for to hold common data in a PC Link System.

distributed control

A automation concept in which control of each portion of an automated sys-

tem is located near the devices actually being control, i.e., control is decen-

tralized and ‘distributed’ over the system. Distributed control is a concept ba-

sic to PC Systems.

electrical noise

Electrical ‘static’ that can disturb electronic communications. The ‘snow’ that

can appear on a TV screen is an example of the effects of electrical noise.

Expansion I/O Backplane

Expansion I/O Rack

A Backplane used to create an Expansion I/O Rack.

Part of a building-block PC, an Expansion I/O Rack is connected to either a

CPU Rack or Slave Rack to increase the number of slots available for mount-

ing Units.

I/O capacity

The number of inputs and outputs that a PC is able to handle. This number

ranges from around one-hundred for smaller PCs to two-thousand for the

largest ones.

I/O Control Unit

I/O devices

A Unit mounted to the CPU Rack in certain PCs to monitor and control I/O

points on Expansion I/O Units.

The devices to which terminals on I/O Units, Special I/O Units, or Intelligent

I/O Units are connected. I/O devices may be either part of the Control Sys-

tem, if they function to help control other devices, or they may be part of the

controlled system.

I/O Interface Unit

I/O point

A Unit mounted to an Expansion I/O Rack in certain PCs to interface the Ex-

pansion I/O Rack to the CPU Rack.

The place at which an input signal enters the PC System or an output signal

leaves the PC System. In physical terms, an I/O point corresponds to termi-

nals or connector pins on a Unit; in terms of programming, an I/O point corre-

sponds to an I/O bit in the IR area.

I/O Unit

The most basic type of Unit mounted to a backplane to create a Rack. I/O

Units include Input Units and Output Units, each of which is available in a

range of specifications. I/O Units do not include Special I/O Units, Link Units,

etc.

interface

An interface is the conceptual boundary between systems or devices and

usually involves changes in the way the communicated data is represented.

Interface devices such a NSBs in Net Link Systems perform operations such

as changing the coding, format, or speed of the data.

Link Adapter

link

A Unit used to connect communications lines, either to branch the lines or to

convert between different types of cable. There are two types of Link

Adapter: Branching Link Adapters and Converting Link Adapters.

A hardware or software connection formed between two Units. “Link” can

refer either to a part of the physical connection between two Units (e.g., opti-

cal links in Wired Remote I/O Systems) or a software connection created to

data existing at another location (Network Data Links).

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Glossary

linkable slot

A slot on either a CPU or Expansion I/O Backplane to which a Link Unit can

be mounted. Backplanes differ in the slots to which Link Units can be

mounted.

Link System

Link Unit

A system that includes one or more of the following systems: Remote I/O

System, PC Link System, Host Link System, or Net Link System.

Any of the Units used to connect a PC to a Link System. These are Remote

I/O Units, I/O Link Units, PC Link Units, Host Link Units, and Net Link Units.

main line

n a Link System connected through Branching Link Adapters, the communi-

cations cable that runs from the Unit at each end of the System through the

Link Adapters.

Multilevel PC Link System

A PC Link System in which at least one PC has two PC Link Units mounted

to it.

Multilink PC Link System

noise interference

A PC Link System in which more than two PCs share a common data area.

Disturbances in signals caused by electrical noise.

optical cable link

In a Wired Remote I/O System, an optical cable connecting two Converting

Link Adapters. Specified because the System otherwise uses wire communi-

cations.

optical communications

A communications method in which signals are sent over optical fiber cable

to prevent noise interference and increase transmission distance.

optical fiber cable

Cable made from light conducting filaments used to transmit signals.

An acronym for Programmable Controller.

PC Link Subsystem

All of the PCs that share the same part of the LR are in a PC Link System.

PC Link Subsystems exist within a PC Link System when one or more of the

PCs in the System has two PC Link Units mounted to it. If Subsystems exist,

the System is considered a Multilevel PC Link System.

PC Link System

A System in which PCs are connected through PC Link Units to enable them

to share common data areas, i.e., each of the PCs writes to certain words in

the LR area and receives the data of the words written by all other PC Link

Units connected in series with it.

PC Link Unit

PC System

The Unit used to connect PCs in a PC Link System.

With building-block PCs, all of the Racks and independent Units connected

directly to them up to, but not including the I/O devices. The limits of the PC

System on the upper end is the PC and the program in its CPU and on the

lower end, I/O Units, Special I/O Units, Optical I/O Units, Remote Terminals,

etc.

peripheral device

polled unit

Devices connected to a PC System to aid in system operation. Peripheral

devices include printers, programming devices, external storage media, etc.

Any of the Units in a PC Lin system that share common data areas except for

the Polling Unit.

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Glossary

polling

A method in which one element in a system monitors changes in the con-

tents of certain data words to maintain accurate records of the contents. In a

PC Link System, polling is performed by the polling unit to maintain common

data areas among PCs.

polling unit

The PC Link Unit in a PC Link System that handles data transmissions to

maintain common data areas within the PCs. In a PC Link System, the poll-

ing unit always shares common data areas with the polled units.

printed circuit board

A board onto which electrical circuits are printed for mounting into a comput-

er or electrical device.

Programmable Controller

A computerized device that can accept inputs from external devices and gen-

erate outputs to external devices according to a program held in memory.

Programmable Controllers are used to automate control of external devices.

Although single-unit Programmable Controllers are available, building-block

Programmable Controllers are constructed from separate components. Such

Programmable Controllers are formed only when enough of these separate

components are assembled to form a functional assembly, i.e., there is no

one individual Unit called a PC.

programming device

A peripheral device used to input a program into a PC or to alter or monitor a

program already held in the PC. There are dedicated programming devices,

such as Programming Consoles, and there are non-dedicated devices, such

as a host computer.

Rack

An assembly of various Units on a Backplane that forms a functional unit in a

building-block PC System. Racks include CPU Racks, Expansion I/O Racks,

I/O Racks, and Slave Racks.

read word

A word in the LR area that contains data transferred from another PC in a PC

Link System. A read word cannot be written to by the PC.

relay-based control

The forerunner of PCs. In relay-based control, groups of relays are wired to

each other to form control circuits. In a PC, these are replaced by program-

mable circuits.

series

A wiring method in which Units are wired consecutively in a string. In Link

Systems wired through Link Adapters, the Units are still functionally wired in

series, even though Units are placed on branch lines.

Single-level PC Link

System

A PC Link System in which there is no PC with more than one PC Link Unit.

Single-link PC Link System A PC Link System that connects only two PCs to each other.

slot

A position on a Rack (Backplane) to which a Unit can be mounted.

Special I/O Unit

A dedicated Unit that is designed for a specific purpose. Special I/O Units

include Position Control Units, High-speed Counter Units, Analog I/O Units,

etc.

switching capacity

The voltage/current that a relay can switch on and off.

system configuration

The arrangement in which Units in a System are connected.

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Glossary

transfer PC

A PC that belongs to two PC Link Subsystems (i.e., has two PC Link Units

mounted to it). A transfer PC can be used to transfer data between the two

PC Link Subsystems to which it belongs.

transmission distance

Unit

The distance that a signal can be transmitted.

In OMRON PC terminology, the word Unit is capitalized to indicate any prod-

uct sold for a PC System. Though most of the names of these products end

with the word Unit, not all do, e.g., a Remote Terminal is referred to in a col-

lective sense as a Unit. Context generally makes any limitations of this word

clear.

unit number

A number assigned to some Link Units and Special I/O Units to assign words

and sometimes other operating parameters to it.

wire communications

A communications method in which signals are sent over wire cable. Al-

though noise resistance and transmission distance can sometimes be a

problem with wire communications, they are still the cheapest and the most

common, and perfectly adequate for many applications.

work word

write word

A word that can be used for data calculation or other manipulation in pro-

gramming, e.g., LR words not used in a PC Link or Net Link System.

A word written in the LR area by a PC in a PC Link System. The data of the

write words is transferred to the rest of the PCs that share common data

areas, i.e., the write words for one PC are read words for the rest of the PCs

in the PC Link System.

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Index

errors

example LED indications, 61, 62

Numbers

general, 66

processing, 55

3G2A5–LK009–E, 2

A-B

application examples, 51

I/O refresh bits (LK401), 26

indicators, 24, 28

applications, precautions, xiii

Branching Link Adapter, PC Link System, 10

inspection and maintenance, 67

installation, precautions, xiii

instructions, IORF(97), 51

C500–LK003–E PC Link Unit, 2

cable connections procedure, 40

cable lengths, 40

LED indications

LK009, 29

LK401, 24

connections, 38

wiring connectors, 41

Level Flag, 60

connector hood, assembly, 41

connector layout, 40

limitations in number of PCs, 9

Link Adapter, PC Link System, 10

connector pin numbers, 39

Link Adapters, 3, 10

termination resistance, 10

control actions in PC Link Systems, 2

Converting Link Adapter, PC Link System, 10

LR area

allocation example for, multilevel system, 13

allocation in Multilevel PC Link System, 14

allocation of different size areas in PC Link System, 13

allocation tables for, 22

use of, 12

using unallocated bits in, 12

data area allocation, Multilevel PC Link System, 14

data configuration, 42

data–transfer PCs, 12

dimensions, 42

DIP switch

LK009, 29

LK401, 25

mode, 32

models numbers, 73

mounting location, 33

Multilevel PC Link System, 6

multilevel system, example, 8

DIP switch cover, LK009, 28

Display

LK009, 28

LK401, 24

multilevel systems, 3

example, 8

display patterns, 29

setting (LK009), 32

N-O

operating environment, precautions, xiii

Error Flag, 60

operating level

PC Link System, 6

word allocation in PC Link System, 14

error tables

C200H, C200HS, and C200HX/HG/HE(–Z) PCs, 65

C500, C500H, C1000H, C2000, and C2000H PCs, 65

Operating Level flags (LK401), 27

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Index

operating level, setting

LK009, 32

LK401, 26

shield wire connections, 38

shutdown, System, preventing, PC Link System, 6

single–level system example, 8

operating levels, 3

Special I/O Unit Error Flags, 67

operation, 17

Special I/O Unit error list, 66

optical fiber cable, PC Link System, 10

optical links, 7, 10

Special I/O Unit number, setting (LK401), 25

Special I/O Unit Restart Bits, 67

Special I/O Unit Restart Bits and Error Flags, 60

specifications, 70

standard Omron products for PC Link Systems, 71

Subsystems, PC Link, 2, 3

PC Link Subsystem, 6

PC Link System

diagram

Link Adapters, 6

switch settings, 10

example, 27

LK009, 25, 29

LK401, 32

LR area allocation, 12, 13, 14

Multilevel System, 7, 14

System using optical cable, 10

Multilevel System, 6

transferring data, 7

switches, 24, 28

system configuration, 6

PC RUN Flag, 59

PCs

applicable, 6

system limitations for, 9

Polling Unit, Multilevel PC Link System, 6

polling unit, 2

termination resistance

LK009, 31

setting on LK401, 26

precautions

applications, xiii

general, xi

operating environment, xiii

safety, xii

transfer PC, 7

transferring data, 12

transfer PCs in PC Link System, 7

transmission delay (LK401), 26

transmission distance, 7

programming examples

simultaneous startup, 16

transferring data between Subsystems, 52

Transmission line selector, LK009, 29

protection, System, PC Link System, 6

transmission line selector, setting

LK009, 32

LK401, 26

transmission time, 21

troubleshooting, 59

response time, 21

response time calculations

C1000H, C2000, and C2000H PCs, 46

C200H PCs, 48

C500 PCs, 46

unit number, word allocation in PC Link System, 13, 14

RS–485 connector

LK009, 28

LK401, 24

unit numbers

determining, 9

setting, LK009, 28

RS–485 interfaces, 38

wiring See connections, 38

safety precautions. See precautions

scan time, PC, 26

work words, PC Link System, 14

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Revision History

A manual revision code appears as a suffix to the catalog number on the front cover of the manual.

Cat. No. W135-E1-3

Revision code

The following table outlines the changes made to the manual during each revision. Page references are to the

previous version of the manual.

Revision code

Date

---

Revised content

Original production

July 1990

Complete reorganization and rewrite

Correction to switch 5 setting on p. 24

Connector model added to Appendix A.

July 1994

May 1996

Address change.

Section of precautions added before section 1 and adjustments made to signal

words for precautions.

Page ix: Introduction to About this Manual rewritten.

Page 42: Connector Pin Numbers section rewritten.

Page 71: Cables and Connectors table corrected.

“Restart Flag” globally corrected to “Restart Bit.”

C200HS and C200HX/HG/HE(-Z) PCs added.

March 2000

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