Appendix; Modbus; Function Codes - Siemens SENTRON PAC3120 Manual

Appendix

A.1

Modbus

Detailed information about Modbus can be found at the Modbus website
(http://www.modbus.org).
A.1.1

Function codes

Function codes control the data exchange. To do this, a function code tells the slave which
action it is to take.
If an error occurs, the MSB bit is set in the response frame in the FC byte.
Supported Modbus function codes
Table A- 1
FC
0 x 01
0 x 02
0 x 03
0 x 04
0 x 05
0 x 06
0 x 0F
0 x 10
0 x 2B
0 x 14
PAC3120 and PAC3220
Equipment Manual, 10/2019, L1V30425208F-01
Supported Modbus function codes
Function in accordance with 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 Device Identification
Read File Record (for demand values)
A
111