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Functions
14.5 Modbus TCP communication
14.5.5
Registers write with function code FC 06
Overview
Function code FC 06 enables write access for the controller to precisely one converter register.
Description of function
The structure of the protocol data unit (PDU) in the case of write access using function code
FC 06 is as follows:
• Byte 7: FCode 06
• Byte 8 and Byte 9: Register
• Byte 10 and Byte 11: Value to be written to the register
Example
Table 14-30
Modbus Applica‐
tion Header
Protocol Data Unit
The converter responds with the register (bytes 8 and 9) and the value (bytes 10 and 11) that
the controller has written to the register.
Table 14-31
Modbus Applica‐
tion Header
Protocol Data Unit
392
Structure of a write request
Value Byte
Description
-
0 ... 6
-
06 h
7
Function code
00 h
8
"High" register (40100)
63 h
9
"Low" register
55 h
10
"High" register data
66 h
11
"Low" register data
Response of the converter to a valid write request
Value
Byte
Description
-
0 ... 6 -
06 h
7
Function code
00 h
8
"High" register
63 h
9
"Low" register
55 h
10
"High" register data
66 h
11
"Low" register data
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
SINAMICS G220 converter
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