Driver Manual
(Supplement to the FieldServer Instruction Manual)
FS-8700-24 ControlNet
APPLICABILITY & EFFECTIVITY
Effective for all systems manufactured after May 1, 2001
Driver Version:
1.06
Document Revision: 7
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FS-8700-24 ControlNet Driver Manual
Page 3 of 12
1.
ControlNet Description
The ControlNet driver allows the FieldServer to transfer data to and from devices using
ControlNet protocol. The SST 5136-CN-ISA Communications Adapter card is included with the
FieldServer. The FieldServer can communicate using un-scheduled transfers with PCCC
messages embedded in the ControlNet messages.
When the FieldServer originates PCCC messages to communicate with PLC5 controllers, it
uses connected messages. This provides fast reliable communication to the other node. When
another device originates PCCC messaging, the FieldServer will emulate a PLC5 controller
supporting connected or unconnected messages to files N7 through to N32..
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2.
Driver Scope of Supply
2.1. Supplied by FieldServer Technologies for this driver
FieldServer Technologies
PART #
Description
Communication Adapter - complete with BNC Tee
Connector
SST 5136-CN-ISA
ControlNet Tools CD
ControlNet Module User’s Guide (Version 1.00)
CNF2BSS.EXE utility
FS-8700-24
Driver Manual.
2.2.
Provided by the Supplier of 3rd Party Equipment
PART #
DESCRIPTION
ControlNet Network with cables and terminators
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3.
Hardware Connections
The FieldServer is connected to the ControlNet Network with 75 ohm coaxial cable. If the
ControlNet is not wired in redundant mode, ensure that all connectors are connected to the
COM A port. A 75 ohm terminator must be placed at either end of the ControlNet Bus.
SST-5136-CN-ISA
FS-x40
A
B
75 O T-pieces
To ControlNet Network
75 O network terminators
(408)-262-2299
FIELDSERVER
CONTROLNET
CONNECTION DIAGRAM
BASE NAME:
FILE NAME: FS8700-24
DATE: 11/4/05
BY: MC
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3.1.
Connection Notes
Before connecting the FieldServer to the network, the FieldServer MacId should be set. The
MacId is the term used for a ControlNet station address. The ControlNet MacId of the
FieldServer is set to the System_Station_Address specified in the FieldServer configuration
file.
Section Title
Bridge
Column Title
System_Station_Address
Function
Provide MacId for the FieldServer
Legal Values
1-99
Example
// .Bridge Information
Bridge
System_Station_Address
5
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4.
Configuring the FieldServer for Unscheduled ControlNet Access with PCCC
messaging
For a detailed discussion on FieldServer configuration, please refer to the FieldServer
Configuration Manual. The information that follows describes how to expand upon the factory
defaults provided in the configuration files included with the FieldServer (See “.csv” sample files
provided with the FieldServer).
This section documents and describes the parameters necessary for configuring the FieldServer
to communicate with ControlNet devices using PCCC messaging. This transfer mechanism
would be used to communicate between the FieldServer and PLC-5 controllers.
The configuration file tells the FieldServer about its interfaces, and the routing of data required.
In order to enable the FieldServer for ControlNet communications, the driver independent
FieldServer buffers need to be declared in the “Data Arrays” section, the FieldServer virtual
node(s) needs to be declared in the “Nodes” section, and the data to be transferred needs to be
mapped in the “Unscheduled Map Descriptors” section. Details on how to do this can be found
below.
Note that in the tables, * indicates an optional parameter, with the bold legal value being the
default.
4.1.
Server Side Connection Descriptors
Section Title
Connections
Column Title
Adapter
Protocol
Function
Adapter Name
Specify protocol used
Legal Values
ControlNet
ControlNet
Example
// Connections
Connections
Adapter,
ControlNet,
Protocol
ControlNet
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4.2.
ControlNet Node Descriptors
This section of the configuration file defines the different MacIds of the ControlNet devices
on the network. If you want to transfer the data on the local ControlNet card to the data-
arrays on your FieldServer, typically used when acting as a Server, define a Node_ID with
the same value as the System_Station_Address.
Section Title
Nodes
Column Title
Function
Legal Values
Up to 32 alphanumeric
characters
Node_Name
Provide name for node
ControlNet MacId of the node
to communicate with
Specify protocol used
Node_ID
Protocol
1-99
ControlNet
Example
// ControlNet Nodes
Nodes
Node_Name,
PLC_1,
Local,
Node_ID,
1,
5,
Protocol
ControlNet
ControlNet
4.3.
Unscheduled Map Descriptors using PCCC messaging
Maintained on the SST 5136-CN-ISA card are 32 integer files (N7-N39) that can be read or
written to by other devices on the ControlNet network using PCCC messaging. Client style
Map Descriptors are used to transfer data to or from the file buffers on the card to the Data
Arrays on the FieldServer.
4.3.1.
FieldServer Specific Map Descriptor Parameters
Column Title
Function
Name of this Map
Descriptor
Legal Values
Up to 32 alphanumeric
characters
Map_Descriptor_Name
One of the Data Array
names from “Data Array”
section above
Data_Array_Name
Name of Data Array
0 to maximum specified in
“Data Array” section above
Data_Array_Offset
Function
Starting offset in Data Array
Function of Client Map
Descriptor
RDBC, WRBC, WRBX
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4.3.2.
Driver Specific Map Descriptor Parameters
Column Title
Function
Legal Values
One of the node names
specified in “Node Descriptor”
above
Name of Node to
communicate with
Node_Name
For local node 7-39
Block_Number
PLC File Number
For remote node 1-999
UINT, (SINT, INT) (REAL,
FLOAT) (BOOL, BIT, FLAG)
Equal types are shown in
brackets.
Type of PCCC data to be
transferred over
ControlNet
PCCC_Type
0 – 999 ( INT, SINT )
Address
Length
Starting address within file 0 – 499 ( REAL, FLOAT )
0 – 15999 ( BOOL, BIT, FLAG )
1 – 249 ( INT, SINT )
Length of Map Descriptor
1 – 124 ( REAL, FLOAT )
1 – 3984 ( BOOL, BIT, FLAG )
Note the number of bytes per PCCC_Type:
SINT, INT = 2 bytes, REAL, FLOAT = 4 bytes, BOOL, BIT, FLAG = 8 bits per byte
Each PLC file is 2000 bytes long and therefore the address values will range from zero
to a maximum value as indicated. The start address is specified in increments of the
basic data type specified under PCCC_Type.
The message buffers in the ControlNet card are each 498 bytes long and only one
message buffer can be allocated to a Map Descriptor. The Map Descriptor lengths are
therefore limited to maximum values as indicated when taking the data type byte lengths
into account.
4.3.3.
Timing Parameters
Column Title
Scan_Interval
Function
Rate at which data is polled >0.1s
Legal Values
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4.3.4.
Unscheduled Map Descriptor Example
The following Map Descriptor will read data from a PLC5.
// Server Side Map Descriptors
Map Descriptors
Map_Descriptor_Name,
A1,
Data_Array_Name,
DA_AI3,
Data_Array_Offset,
0,
Function, Node_Name,
RDBC, PLC5,
Block_Number,
7,
PCCC_Type,
SINT,
Address, Length
33,
5
Active Map Descriptor
polls the PLC regularly
(change to WRBC to write)
Remote Node
name of the PLC
to poll
Offset into the file
(N7:33)
PLC 5 file number to
read (N7:33)
The following Map Descriptor will send data to the card to allow other nodes to read the data contained in the FieldServer’s Data
Array.
// Server Side Map Descriptors
Map Descriptors
Map_Descriptor_Name,
A1,
Data_Array_Name,
DA_AI3,
Data_Array_Offset,
0,
Function, Node_Name,
WRBC, Local,
Block_Number,
7,
PCCC_Type,
SINT,
Address, Length
125,
5
Active Map Descriptor
transfers the data to or
from the card (change to
RDBC to read data
Node name whose MacId
matches the
System_Station_Address
PLC 5 emulated file
number (7-39)
Offset into the file
(N7:125)
written by other nodes)
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Appendix A. Advanced Topics
Appendix A.1. Write-throughs
Some FieldServer drivers support “write-throughs”. This is the ability of a Read Map
Descriptor to automatically create a temporary write Map Descriptor to update the value of
an external R/W (Read or Write) memory location. Since the ControlNet card contains
separate Read-Only (Output) and Write-Only (Input) Buffers, write-throughs are not
supported on ControlNet messaging, but are supported for PCCC messaging. This is
because PCCC messages are embedded within ControlNet messages allowing for the
receiving device to process the embedded write message.
Appendix A.2. Map Descriptor functions
The diagram below explains the difference between the use of WRBC (Write Block
Continuous) and RDBC (Read Block Continuous) Map Descriptors. Note that WRBC Map
Descriptors write data from the FieldServer’s Data Arrays into the output data memory area
of the card whereas RDBC Map Descriptors place data from the card’s input data memory
area into the FieldServer’s Data Arrays. The IO data memory areas are kept in RAM on the
card and are defined by Connection Control Blocks on the card.
FieldServer
Data Array
Data Array
WRBC Mapdesc
RDBC Mapdesc
ControlNet Device
SST 5136-CN Card
Input data memory
area
Output data memory
area
Output data memory
area
Input data memory
area
Connection
Control
Block 01
ControlNet
Network
.
.
.
Input data memory
area
Output data memory
area
Connection
Control
Block 128
Note:
1. For ControlNet messaging the target connection is specified
by Node_Name & CN_Instance.
2. For PCCC messaging the target connection is specified by
Node_Name & Block_Number.
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