6 Application example: Modbus TCP
6.3 Communication examples: Modbus TCP
XI/ON: XNE-GWBR-2ETH-MB
10/2011 MN05002008Z-EN
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121
6.3.3
Reading-out the actual module list
In order to compare both lists, the actual module list can be read from registers 0×2A00 to
0×2A40 using function code 03 again.
In this case, the actual module list shows a deviation from the reference module list at module
position "4". No ident-no. could be read out.
→
Module
XN-2AI-THERMO-PI
is not found in the actual station configuration.
Figure 52:
Reading the ac-
tual module list
Figure 53:
Actual module
list
A
empty slot,
module pulled
A