Siemens SIRIUS 3RW5 Equipment Manual page 103

7.2.3 Function Code 05 (Write Single Coil)
This function enables the writing of an individual bit from the 3RW5 bit memory area by the
Modbus TCP client system or the Modbus RTU master system.
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 136).
0x0000 for a logical zero and 0xFF00 for a logical one are accepted as data. Any other value
is impermissible and given a negative acknowledgment.
Request telegram
Modbus TCP:
Address Field
7 bytes
-
Modbus RTU:
Slave address
1 byte
-
Response telegram
Modbus TCP:
Address Field
7 bytes
-
Modbus RTU:
Slave address
1 byte
-
SIRIUS 3RW5 Modbus communication module
Equipment Manual, 03/2020, A5E43676481002A/RS-AC/003
Function Code
1 byte
0x05
Function Code Start address
1 byte 2 bytes
0x05 0x8200
Function Code
1 byte
0x05
Function Code Start address
1 byte 2 bytes
0x05 0x8200
Messages and diagnostics
Start address
2 bytes
0x8200
Data
2 bytes
0xFF00
Start address
2 bytes
0x8200
Data
2 bytes
0xFF00
7.2 Function Codes
Data
2 bytes
0xFF00
CRC
2 bytes
-
Data
2 bytes
0xFF00
CRC
2 bytes
-
103