User Guide

FS -8700-02 Modbus Plus Driver Manual
FieldServer Technologies 1991 Tarob Court, Milpitas, California 95035 [phone] fax: [phone]
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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
One of the Data Array
names from “Data
Array” section above
Data_Array_Offset Starting location in Data
Array
0 to maximum
specified in “Data
Array” section above
Function Function of Client Map
Descriptor
Server
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
-32767 to 32767,
default 0
Node_High_Scale* Scaling max in Connected
Node
-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.