FieldServer FS-8700-24 User Manual

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

FS-8700-24 ControlNet Driver Manual Table of Contents

TABLE OF CONTENTS

1. ControlNet Description...................................................................................................3

2. Driver Scope of Supply...................................................................................................4

2.1. Supplied by FieldServer Technologies for this driver ...................................................4

2.2. Provided by the Supplier of 3rd Party Equipment..........................................................4

3. Hardware Connections...................................................................................................5

3.1. Connection Notes.........................................................................................................6

4. Configuring the FieldServer for Unscheduled ControlNet Access with PCCC

messaging .......................................................................................................................7

4.1. Server Side Connection Descriptors.............................................................................7

4.2. ControlNet Node Descriptors........................................................................................8

4.3. Unscheduled Map Descriptors using PCCC messaging ..............................................8

4.3.1. FieldServer Specific Map Descriptor Parameters .....................................................8

4.3.2. Driver Specific Map Descriptor Parameters..............................................................9

4.3.3. Timing Parameters....................................................................................................9

4.3.4. Unscheduled Map Descriptor Example...................................................................10

Appendix A. Advanced Topics............................................................................................11

Appendix A.1. Write-throughs...............................................................................................11

Appendix A.2. Map Descriptor functions...............................................................................11

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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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FS-8700-24 ControlNet Driver Manual Page 4 of 12

2. Driver Scope of Supply

2.1. Supplied by FieldServer Technologies for this driver

FieldServer Technologies
PART #

SST 5136-CN-ISA

Description

Communication Adapter - complete with BNC Tee

Connector
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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FS-8700-24 ControlNet Driver Manual Page 5 of 12

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

75 O T-pieces

AB

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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FS-8700-24 ControlNet Driver Manual Page 6 of 12

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 Function Legal Values

System_Station_Address Provide MacId for the FieldServer 1-99

Example

// .Bridge Information
Bridge

System_Station_Address
5

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FS-8700-24 ControlNet Driver Manual Page 7 of 12

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 Function Legal Values

Adapter Adapter Name ControlNet
Protocol Specify protocol used ControlNet

Example

// Connections
Connections

Adapter, Protocol
ControlNet, ControlNet

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FS-8700-24 ControlNet Driver Manual Page 8 of 12

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 data­arrays 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

Node_Name Provide name for node
Node_ID

Protocol Specify protocol used ControlNet

Example

// ControlNet Nodes
Nodes

Node_Name, Node_ID, Protocol
PLC_1, 1, ControlNet
Local, 5, ControlNet

ControlNet MacId of the node
to communicate with

Up to 32 alphanumeric
characters

1-99

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 Legal Values

Map_Descriptor_Name

Data_Array_Name Name of Data Array

Data_Array_Offset Starting offset in Data Array
Function

Name of this Map
Descriptor

Function of Client Map
Descriptor

Up to 32 alphanumeric
characters
One of the Data Array
names from “Data Array”
section above
0 to maximum specified in
“Data Array” section above

RDBC, WRBC, WRBX

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FS-8700-24 ControlNet Driver Manual Page 9 of 12

4.3.2. Driver Specific Map Descriptor Parameters

Column Title Function Legal Values

Node_Name

Block_Number PLC File Number

PCCC_Type

Address Starting address within file

Length Length of Map Descriptor

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.

Name of Node to
communicate with

Type of PCCC data to be
transferred over
ControlNet

One of the node names
specified in “Node Descriptor”
above
For local node 7-39

For remote node 1-999
UINT, (SINT, INT) (REAL,

FLOAT) (BOOL, BIT, FLAG)
Equal types are shown in
brackets.
0 – 999 ( INT, SINT )
0 – 499 ( REAL, FLOAT )
0 – 15999 ( BOOL, BIT, FLAG )
1 – 249 ( INT, SINT )
1 – 124 ( REAL, FLOAT )
1 – 3984 ( BOOL, BIT, FLAG )

4.3.3. Timing Parameters

Column Title Function Legal Values

Scan_Interval Rate at which data is polled >0.1s

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(

)

(

)

FS-8700-24 ControlNet

Driver Manual Page 10 of 12

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, Data_Array_Name, Data_Array_Offset, Function, Node_Name, Block_Number, PCCC_Type, Address, Length
A1, DA_AI3, 0, RDBC, PLC5, 7, SINT, 33, 5

Active Map Descriptor
polls the PLC regularly
(change to WRBC to write)

Remote Node
name of the PLC
to poll

PLC 5 file number to

N7:33

read

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, Data_Array_Name, Data_Array_Offset, Function, Node_Name, Block_Number, PCCC_Type, Length Address,
A1, DA_AI3, 0, WRBC, Local, 7, SINT, 5 125,

Offset into the file

N7:33

Active Map Descriptor
transfers the data to or
from the card (change to
RDBC to read data
written by other nodes)

Node name whose MacId
matches the
System_Station_Address

PLC 5 emulated file
number (7-39)

Offset into the file
(N7:125)

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FS-8700-24 ControlNet Driver Manual Page 11 of 12

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

WRBC Mapdesc

Connection

Block 01

Connection

Control

Block 128

SST 5136-CN Card

Control

Data Array

RDBC Mapdesc

Input data memory

area

Output data memory

area

.
.
.

Input data memory

area

Output data memory

area

ControlNet

Network

ControlNet Device

Output data memory

area

Input data memory

area

Note:

1. For ControlNet messagi ng the target connection is specified
by Node_Name & CN_Instance.

2. For PCCC messaging the target c on ne c tion is specified by
Node_Name & Block_Number.

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FS-8700-24 ControlNet Driver Manual Page 12 of 12

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