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7.2 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 destination node on TCP/IP.
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 bridge’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 bridge will forward the message to the TCP
node whose IP address is in this location in the bridge’s TCP Mapping table.
Figure 33 MSTR in Modbus Plus Node