Function Code 05 (Write Single Coil) - Siemens SIRIUS 3RW5 series Manual

7.2.3

Function Code 05 (Write Single Coil)

This function enables the Modbus client system to write an individual bit from the 3RW5 bit
memory area.
A valid address from the bit memory area is expected as the start address. The selected
address must be designated as writable in the data tables in chapter Data tables (Page 75).
Request telegram
Address Field
7 bytes
-
Response telegram
Address Field
7 bytes
-
Example
Setting the bit address of the "Motor CW" command to a logical one:
● Address field: The address of the 3RW5 soft starter is not entered in the example (-).
● The bit address of "Motor CW" is 0x8200.
You will find the data table for the process image output in chapter Process image output
(PIQ) (Page 81).
SIRIUS 3RW5 Modbus TCP communication module
Manual, 03/2018, A5E43676481002A/RS-AA/001
Function Code
1 byte
0x05
Function Code
1 byte
0x05
Messages and diagnostics
Start address
2 bytes
0x8200
Start address
2 bytes
0x8200
7.2 Function Codes
Data
2 bytes
0x0001
Data
2 bytes
0x0001
55