Implementation of Modbus TCP
D301271 1013 - FGEN - multi protocol9-6
9.2 Implemented Modbus functions
The FGEN stations for Modbus TCP support the following functions for accessing process data,
parameters, diagnostics and other services.
Table 9-2:
Implemented
functions
Function codes
No. Function
Description
1 Read Coils
Serves for reading multiple output bits.
2 Read Discrete Inputs
Serves for reading multiple input bits.
3 Read Holding Registers
Serves for reading multiple output registers.
4 Read Input Registers
Serves for reading multiple input registers.
5 Write Single Coil
Serves for writing a single output bit.
6 Write Single Register
Serves for writing a single output register.
15 Write Multiple Coils
Serves for writing multiple output bits.
16 Write Multiple Registers
Serves for writing multiple output registers.
23 Read/Write Multiple Registers
Reading and writing of multiple registers.
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