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6 Application example: Modbus TCP
6.3 Communication examples: Modbus TCP
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XI/ON: XNE-GWBR-2ETH-MB 10/2011 MN05002008Z-EN www.eaton.com
6.3 Communication examples: Modbus TCP
The next pages contain descriptions of different examples for Modbus TCP-communication as
well as for the interpretation of the Modbus TCP-telegram.
The following XI/ON example station is used:
The communication between PC and XI/ON-gateway is established via a standard network
interface card and the software "Modbus Server Tester" from the Modbus organization
(www.modbus.org).
Table 60:
Example station Module Data width
Proc. in Proc. out Alignment
GW XNE-GWBR-2ETH-MB
0 XN-2AI-I(0/4...20MA) 2 words - word by word
1 XN-2DI-24VDC-P 2 bits - bit by bit
2 XN-2DO-24VDC-0.5A-P - 2 bits bit by bit
3 XN-2AI-THERMO-PI 2 words - word by word
4 XN-4DI-24VDC-P 4 bits bit by bit
5 empty slot
6 XN-1AI-U(-10/0...+10VDC) 1 word - word by word
7 XN-2AO-I(0/4...20MA) 2 words word by word
8 XN-4DI-24VDC-P 4 bits bit by bit
9 XN-1SSI 4 words 4 words word by word
Note
Detailed information concerning the register mapping, the implemented modbus
functions, the module parameters and diagnostic messages can be found in Chapter
5 Implementation of Modbus TCP, Page 49 of this manual.