Siemens SENTRON PAC1020 - Exception Codes

PAC1020
Equipment Manual, 05/2020, L1V30610008B-01
79
Appendix
A
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 Supported Modbus function codes
FC
Function in accordance with Modbus specification
0x01
Read Coils
0x02
Read Discrete Inputs
0x03
Read Holding Registers
0x04
Read Input Registers
0x05
Write Single Coil
0x06
Write Single Register
0x0F
Write Multiple Coils
0x10
Write Multiple Registers
0x2B
Read Device Identification