Siemens SENTRON PAC2200, Product Manual, Page: 99 / 130

PAC2200
Equipment Manual, 12/2019, L1V30415167B-03
97
Appendix
A
A.1 Modbus TCP
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. In doing so, a function code tells the slave which
action it is to take.
If an error occurs, the most significant bit (MSB) is set in the FC byte of the response frame.
Supported Modbus function codes
Table A- 1 Supported Modbus function codes
FC Function in accordance with Modbus specification
0 x 01 Read Coils
0 x 02 Read Discrete Inputs
0 x 03 Read Holding Registers
0 x 04 Read Input Registers
0 x 05 Write Single Coil
0 x 06 Write Single Register
0 x 0F Write Multiple Coils
0 x 10 Write Multiple Registers
0 x 2B Read Device Identification
0 x 14 Read File Record (for mean values)