Siemens SIRIUS 3RW5 Equipment Manual page 105

7.2.4 Function Code 06 (Write Single Register)
This function enables the Modbus TCP client system or the Modbus RTU master system to
write an individual register from the 3RW5 register memory area.
A valid address from the register 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).
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
-
Example
Setting the starting mode "Voltage ramp + Current limiting":
● Address Field or slave address: The address of the 3RW5 soft starter is not entered in
the example (-).
● The CRC CHECK is not entered in the example (-).
● The register address of the starting mode is 0x9409.
● For the starting mode "Voltage ramp + Current limiting" the value 5 is transmitted to the
3RW5 soft starter (0x0005).
You can find the data table for the parameters in Parameters (Page 164).
SIRIUS 3RW5 Modbus communication module
Equipment Manual, 03/2020, A5E43676481002A/RS-AC/003
Function Code
1 byte
0x06
Function Code Start address
1 byte 2 bytes
0x06 0x9409
Function Code
1 byte
0x06
Function Code Start address
1 byte 2 bytes
0x06 0x9409
Messages and diagnostics
Start address
2 bytes
0x9409
Data
2 bytes
0x0005
Start address
2 bytes
0x9409
Data
2 bytes
0x0005
7.2 Function Codes
Data
2 bytes
0x0005
CRC
2 bytes
-
Data
2 bytes
0x0005
CRC
2 bytes
-
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