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FS-8700-02 Modbus Plus
3.2.4 Server Side Map Descriptors
Section Title
Map_Descriptors
Column Title
Map_Descriptor_Name
Data_Array_Name
Data_Array_Offset
Function
Node_Name
Address
Length
Data_Array_Low_Scale*
Data_Array_High_Scale* Scaling max in Data Array
Node_Low_Scale*
Node_High_Scale*
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.
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Function
Name of this Map Descriptor
Name of Data Array where
data is to be stored in the
FieldServer
Starting location in Data
Array
Function of Client Map
Descriptor
Name of Node to fetch data
from
Starting address of read block
Number of items to read
Scaling zero in Data Array
Scaling zero in Connected
Node
Scaling max in Connected
Node
The MSTR Function Code specifies a Write operation
One register of data is to be transferred
The destination register is 40000 (addressed as register 1).
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.
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.
Page 6
Legal Values
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
Server
One of the node
names specified in
"Client Node
Descriptor" above
40001, 30001, etc
1 - 125
-32767 to 32767,
default 0
-32767 to 32767,
default 100
-32767 to 32767,
default 0
-32767 to 32767,
default 100
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