Siemens SINAMICS G220 - Registers Write with Function Code FC 06

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 Structure of a write request
 Value Byte Description
Modbus Applica‐
tion Header
- 0 … 6 -
Protocol Data Unit 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
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 Response of the converter to a valid write request
 Value Byte Description
Modbus Applica‐
tion Header
- 0 … 6 -
Protocol Data Unit 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
Functions
14.5Modbus TCP communication
SINAMICS G220 converter
392 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB