Siemens SIRIUS 3RW5 - Ethernet Link Object

Messages and diagnostics
7.2 Function Codes
SIRIUS 3RW5 Modbus communication module
108 Equipment Manual, 03/2020, A5E43676481002A/RS-AC/003
7.2.6 Function Code 16 (Write Multiple Registers)
This function enables the Modbus TCP client system or the Modbus RTU master system to
write multiple registers 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).
When writing several registers, they must be identified as a "writable" coherent block. A
register area that is interrupted by read-only registers cannot be written to as a block.
Request telegram
Modbus TCP:
Address Field
Function Code
Start address
Number of
registers
Number of bytes
Data
7 bytes
1 byte
2 bytes
2 bytes
1 byte
n x 2 bytes
-
0x10
0x9403
0x0002
0x04
0x0000 0x2710
Modbus RTU:
Slave address
Function Code
Start address
Number of
registers
Number of
bytes
Data
CRC
1 byte
1 byte
2 bytes
2 bytes
1 byte
n x 2 bytes
2 bytes
-
0x10
0x9403
0x0002
0x04
0x0000 0x2710
-
Response telegram
Modbus TCP:
Address Field
Function Code
Start address
Number of registers
7 bytes
1 byte
2 bytes
2 bytes
-
0x10
0x9403
0x0002
Modbus RTU:
Slave address
Function Code
Start address
Number of
registers
CRC
1 byte
1 byte
2 bytes
2 bytes
2 bytes
-
0x10
0x9403
0x0002
-