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6 Application example: Modbus TCP
6.3 Communication examples: Modbus TCP
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6.3.2 Reading-out the reference module list
The reference module list is stored in the register area 0×2800 to 0×2840. It can be read by
using function code 03 "read multiple registers":
Each module is clearly identified by a 4-byte ident-number. Bytes 3 to 1 define module type,
Byte 0 is reserved for manufacturer specific data.
Figure 50:
Reading out the
reference mo-
dule list
Figure 51:
Reference mo-
dule list
A
Ident no. of
module 0
A