FieldServer FS-8700-02 User Manual

A Sierra Monitor Company

Driver Manual

(Supplement to the FieldServer Instruction Manual)

FS-8700-02 Modbus Plus

APPLICABILITY & EFFECTIVITY

Effective for all systems manufactured after May 1, 2001

Instruction Manual Part Number FS-8700-02

Version 1.00

Revision 1a

5/24/2002

FS-8700-02 Modbus Plus Driver Manual

Table of Contents

1. Modbus Plus Description............................................................................................................. 1

1.1 Hardware/Software............................................................................................................... 1

2. FieldServer as a Modbus Plus Client ............................................................................................ 3

2.1 Hardware Connections .......................................................................................................... 3

2.2 Configuration File Structure................................................................................................... 3

2.2.1 Data Arrays .......................................................................................................................3

2.2.2 Client Side Connections ..................................................................................................... 3

2.2.3 Client Side Nodes ..............................................................................................................3

2.2.4 Client Side Map Descriptors ...............................................................................................4

3. FieldServer as a Modbus Plus Server............................................................................................ 5

3.1 Hardware Connections .......................................................................................................... 5

3.2 Configuration File Structure................................................................................................... 5

3.2.1 Data Arrays .......................................................................................................................5

3.2.2 Server Side Connections .................................................................................................... 5

3.2.3 Server Side Nodes............................................................................................................. 5

3.2.4 Server Side Map Descriptors.............................................................................................. 6

3.3 Examples of FieldServer setup for typical clients .................................................................... 6

FieldServer Technologies 1991 Tarob Court, Milpitas, California 95035 [phone] fax: [phone]

Visit our website: www.fieldserver.com E-mail: [e-mail]

Page Index

FS-8700-02 Modbus Plus Driver Manual

1. Modbus Plus Description

The Modbus Plus driver allows the FieldServer to transfer data to and from devices using
Modbus Plus protocol. The FieldServer can emulate either a Server or Client.

The information that follows describes how to expand upon the factory defaults provided in the
configu ration files included with the FieldServer.

The FieldServer is shipped with the switches set of a default address of 11.

Set the Modbus Plus address switches 1--6 to the address in your application. Switches 7 and 8
are not used.

Switch 1 is the least significant bit of the address. Switch 6 is the most significant bit. The address
will be one higher than the binary value you set into the switches.

1.1 Hardware/Software
Supplied by FieldServer

FieldServer

DESCRIPTION

Technologies PART #

FS-8915-01 Adapter Card, Modbus Plus, Single Port. User must supply

Modbus Plus cables and connectors, including termination
connectors as documented by Group Schneider/Modicon

Provided by user

PART # DESCRIPTION

Refer to the Drawings in section 3
Modbus Plus Client, e.g. Wonderware, Intellution FIX, GE

Cimplicity, etc.

1

If FieldServer used as Modbus Plus Client.

2

If FieldServer used as Modbus Plus Server.

2

1

Table 1: Modbus Plus Addresses and Switch Settings

Address Switches 6--1 Address Switches 6--1 Address Switches 6--1

1 0 0 0 0 0 0 23 0 1 0 1 1 0 45 1 0 1 1 0 0
2 0 0 0 0 0 1 24 0 1 0 1 1 1 46 1 0 1 1 0 1
3 0 0 0 0 1 0 25 0 1 1 0 0 0 47 1 0 1 1 1 0
4 0 0 0 0 1 1 26 0 1 1 0 0 1 48 1 0 1 1 1 1
5 0 0 0 1 0 0 27 0 1 1 0 1 0 49 1 1 0 0 0 0
6 0 0 0 1 0 1 28 0 1 1 0 1 1 50 1 1 0 0 0 1
7 0 0 0 1 1 0 29 0 1 1 1 0 0 51 1 1 0 0 1 0
8 0 0 0 1 1 1 30 0 1 1 1 0 1 52 1 1 0 0 1 1
9 0 0 1 0 0 0 31 0 1 1 1 1 0 53 1 1 0 1 0 0
10 0 0 1 0 0 1 32 0 1 1 1 1 1 54 1 1 0 1 0 1
11* 0 0 1 0 1 0 33 1 0 0 0 0 0 55 1 1 0 1 1 0
12 0 0 1 0 1 1 34 1 0 0 0 0 1 56 1 1 0 1 1 1
13 0 0 1 1 0 0 35 1 0 0 0 1 0 57 1 1 1 0 0 0

FieldServer Technologies 1991 Tarob Court, Milpitas, California 95035 [phone] fax: [phone]

Visit our website: www.fieldserver.com E-mail: [e-mail]

Page 1

FS-8700-02 Modbus Plus Driver Manual

Address Switches 6--1 Address Switches 6--1 Address Switches 6--1

14 0 0 1 1 0 1 36 1 0 0 0 1 1 58 1 1 1 0 0 1
15 0 0 1 1 1 0 37 1 0 0 1 0 0 59 1 1 1 0 1 0
16 0 0 1 1 1 1 38 1 0 0 1 0 1 60 1 1 1 0 1 1
17 0 1 0 0 0 0 39 1 0 0 1 1 0 61 1 1 1 1 0 0
18 0 1 0 0 0 1 40 1 0 0 1 1 1 62 1 1 1 1 0 1
19 0 1 0 0 1 0 41 1 0 1 0 0 0 63 1 1 1 1 1 0
20 0 1 0 0 1 1 42 1 0 1 0 0 1 64 1 1 1 1 1 1
21 0 1 0 1 0 0 43 1 0 1 0 1 0
22 0 1 0 1 0 1 44 1 0 1 0 1 1 * = default

Table 2: Summary of Modbus Data Access Commands
Function Code (Decimal) Command Name

1 Read Discrete Output Status (0xxxx)
2 Read Discrete Input Status (1xxxx)
3 Read Output Register (4xxxx)
4 Read Input Register (3xxxx)
5 Force Single Coil (0xxxx)
6 Preset Single Register (4xxxx)
15 Force Multiple Coils (0xxxx)
16 Preset Multiple Registers (4xxxx)

Modbus Plus Card Indicators

The Modbus Plus card has an indicator that flashes a repetitive pattern to show its network
communication status, plus two indicators which identify communication errors on the two
Modbus Plus cable paths. Note that one error indicator will be lit normally in single-cable
installations, showing that a second cable does not exist.

Table 3: Modbus Plus Active Indicator Patterns

Indicator Pattern (Green) Status

Six flashes/second Normal operating state. All nodes on a healthy

network flash this pattern

One flash/second The node is off-line. After being in this state for 5

seconds, the node attempts to go to its normal

operating state.
Two flashes, then OFF for 2
seconds

The node detects the network token being passed

among other nodes, but it never receives the

token.
Three flashes, then OFF for

1.7 seconds
Four flashes, then OFF for

1.4 seconds

The node does not detect any token passing on the

network.

The node has detected another node using the

same address.

FieldServer Technologies 1991 Tarob Court, Milpitas, California 95035 [phone] fax: [phone]

Visit our website: www.fieldserver.com E-mail: [e-mail]

Page 2

FS-8700-02 Modbus Plus Driver Manual

2. FieldServer as a Modbus Plus Client

2.1 Hardware Connections

It is possible to connect a Modbus RTU device to any of the eight RS232 ports or two RS485
ports. These ports just need to be configured for Modbus RTU in the configuration file.

Configure the PLC according to manufacturer’s instructions.

2.2 Configuration File Structure

Refer to section 4.1 of the Instruction Manual for a description of the operation prin ciple
of the FieldServer. The following tables describe parameters that need to be filled out in
the configuration file. For convenience, a few example parameters already exist in the
supplied PRIMSERV.CSV and SECDSERV.CSV files.

Note that * indicates an optional parameter, with the bold legal value being the default.

2.2.1 Data Arrays
Section Title

Data_Arrays

Column Title Function Legal Values

Data_Array_Name Provide name for Data Array Up to 15

alphanumeric
characters

Data_Format Provides data format INT16, INT32, BIT,

FLOAT

Data_Array_Length Number of Data Objects 1-10,000

2.2.2 Client Side Connections
Section Title

Connections

Column Title Function Legal Values

Adapter Adapter name MBP

2.2.3 Client Side Nodes
Section Title

Nodes

Column Title Function Legal Values

Node_Name Provide name for node Up to 32

alphanumeric

characters
Route Modbus Plus Path Note 1*
Protocol Specify protocol used Modbus Plus

Note 1: Refer to the Modicon user guide 890 USE 102 00 for details on path
establishment. In general, the first number is the Destination BM85 MAC address,
the second number represents the internal path, and the third number is the
destination node. This varies if the BM85 is not connected to the FieldServer.

FieldServer Technologies 1991 Tarob Court, Milpitas, California 95035 [phone] fax: [phone]

Visit our website: www.fieldserver.com E-mail: [e-mail]

Page 3

FS-8700-02 Modbus Plus Driver Manual

2.2.4 Client Side Map Descriptors
Section Title

Map_Descriptors

Column Title Function Legal Values

Map_Descriptor_Name Name of this Map Descriptor Up to 32

alphanumeric
characters

Data_Array_Name Name of Data Array where

data is to be stored in the
FieldServer

Data_Array_Offset Starting location in Data

Array

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

Function Function of Client Map

RDBC

Descriptor

Node_Name Name of Node to fetch data

from

One of the node
names specified in
“Client Node

Descriptor” above
Address Starting address of read block 40001, 30001, etc
Length Number of items to read 1 - 125

Data_Array_Low_Scale* Scaling zero in Data Array -32767 to 32767,

default 0
Data_Array_High_Scale* Scaling max in Data Array -32767 to 32767,

default 100
Node_Low_Scale* Scaling zero in Connected

Node

Node_High_Scale* Scaling max in Connected

Node

-32767 to 32767,

default 0

-32767 to 32767,

default 100

FieldServer Technologies 1991 Tarob Court, Milpitas, California 95035 [phone] fax: [phone]

Visit our website: www.fieldserver.com E-mail: [e-mail]

Page 4

FS-8700-02 Modbus Plus Driver Manual

3. FieldServer as a Modbus Plus Server

3.1 Hardware Connections

Refer to the Drawings in section 4
Configure the Modbus Plus client according to manufacturer’s instructions (refer to
section below on examples of FieldServer setup for typical clients

3.2 Configuration File Structure

Refer to section 4.1 of the Instruction Manual for a description of the operation principle
of the FieldServer. The following tables describe parameters that need to be filled out in
the configuration file. For convenience, a few example parameters already exist in the
supplied PRIMSERV.CSV and SECDSERV.CSV files.

Note that * indicates an optional parameter, with the bold legal value being the default.

3.2.1 Data Arrays
SectionTitle

Data_Arrays

Column Title Function Legal Values

Data_Array_Name Provide name for Data Array Up to 15

alphanumeric
characters

Data_Format Provides data format INT16, INT32, BIT,

FLOAT

Data_Array_Length Number of Data Objects 1-10,000

3.2.2 Server Side Connections

Section Title

Connections

Column Title Function Legal Values

Adapter Adapter name MBP
Internal Path Modbus Plus data path 1 - 8

3.2.3 Server Side Nodes

Section Title

Nodes

Column Title Function Legal Values

Node_Name Provide name for node Up to 32

alphanumeric

characters
Node_ID Node ID of virtual server node 1 – 255
Protocol Specify protocol used Modbus Plus

FieldServer Technologies 1991 Tarob Court, Milpitas, California 95035 [phone] fax: [phone]

Visit our website: www.fieldserver.com E-mail: [e-mail]

Page 5

FS-8700-02 Modbus Plus Driver Manual

3.2.4 Server Side Map Descriptors
Section Title

Map_Descriptors

Column Title Function Legal Values

Map_Descriptor_Name Name of this Map Descriptor Up to 32

alphanumeric
characters

Data_Array_Name Name of Data Array where

data is to be stored in the
FieldServer

Data_Array_Offset Starting location in Data

Array

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

Function Function of Client Map

Server

Descriptor

Node_Name Name of Node to fetch data

from

One of the node
names specified in
“Client Node

Descriptor” above
Address Starting address of read block 40001, 30001, etc
Length Number of items to read 1 - 125

Data_Array_Low_Scale* Scaling zero in Data Array -32767 to 32767,

default 0
Data_Array_High_Scale* Scaling max in Data Array -32767 to 32767,

default 100
Node_Low_Scale* Scaling zero in Connected

Node

Node_High_Scale* Scaling max in Connected

Node

-32767 to 32767,

default 0

-32767 to 32767,

default 100

3.3 Examples of FieldServer setup for typical clients
MSTR Example: Modbus Plus Node

This example shows a Modicon Modsoft screen for an MSTR function in a Modbus Plus
node. It writes one register of data to a virtual node in the FieldServer.

H The MSTR Function Code specifies a Write operation
H One register of data is to be transferred
H The destination register is 40000 (addressed as register 1).
H The FieldServer’s node address is 1. Note that the decimal value 1025

equals 0401 hexadecimal, addressing a Modbus Plus Network Option
Module (NOM) in backplane slot 04 and a node at address 01.

H The destination index is 28. The FieldServer will forward the message to

the TCP node whose IP address is in this location in the FieldServer’s TCP
Mapping table.

FieldServer Technologies 1991 Tarob Court, Milpitas, California 95035 [phone] fax: [phone]

Visit our website: www.fieldserver.com E-mail: [e-mail]

Page 6

FS-8700-02 Modbus Plus Driver Manual

MSTR in Modbus Plus Node

FieldServer Technologies 1991 Tarob Court, Milpitas, California 95035 [phone] fax: [phone]

Visit our website: www.fieldserver.com E-mail: [e-mail]

Page 7