Siemens SIMOCODE pro - Modbus RTU Function Codes

Communication
2.3 Modbus communication
SIMOCODE pro - Communication
98 Function Manual, 11/2018, A5E40508495002A/RS-AC/003
2.3.1.6
Modbus RTU function codes
General
Definition of function code
The function code defines the meaning of the message frame. The frame structure is also
defined by the function code.
Overview of the function codes
The table below provides an overview of the supported function codes. Which of these are
supported by SIMOCODE pro depends on the start address (see Section Modbus RTU data
tables (Page 277)).
Table 2- 33 Overview of the function codes
Function code
(decimal/hexadecimal)
Designation according to Modbus specification
01 / 0x01 (Page 100)
Read Coils
02 / 0x02 (Page 100)
Read Discrete Inputs
03 / 0x03 (Page 101)
Read Holding Registers
04 / 0x04 (Page 101) Read Input Registers
05 / 0x05 (Page 102)
Write Single Coil
06 / 0x06 (Page 103) Write Single Register
15 / 0x0F (Page 104)
Write Multiple Coils
16 / 0x10 (Page 105)
Write Multiple Registers
23 / 0x17 (Page 106)
Read/Write Multiple Registers
43 / 0x2B (Page 108)
Read Device Identification