Function Codes - Siemens SIRIUS 3RW5 Equipment Manual

Messages and diagnostics

7.2 Function Codes

7.2 Function Codes
The Function Code defines the meaning of the telegram and defines the telegram structure.
Overview of the Function Codes
Function Code (decimal/hexadecimal)
01 / 0x01 (Page 100)
02 / 0x02 (Page 100)
03 / 0x03 (Page 101)
04 / 0x04 (Page 101)
05 / 0x05 (Page 103)
06 / 0x06 (Page 105)
15 / 0x0F (Page 106)
16 / 0x10 (Page 108)
23 / 0x17 (Page 110)
Access to memory areas
Two memory areas are used in the 3RW5 Soft Starter:
● A memory area for addressing the bit information
● A memory area for addressing the register information
The Function Codes for bit information (01, 02, 05, 15) thus always access the bit memory
area. The Function Codes for register information (03, 04, 06, 16, 23) always access the
register memory area.
Whether information is read-only (r) or read/writeable (r/w) is stated in the data tables in
chapter Data tables (Page 136).
98
Designation according to Modbus specification
Read Coils
Read Discrete Inputs
Read Holding Registers
Read Input Registers
Write Single Coil
Write Single Register
Write Multiple Coils
Write Multiple Registers
Read/Write Multiple Registers
SIRIUS 3RW5 Modbus communication module
Equipment Manual, 03/2020, A5E43676481002A/RS-AC/003