31
2018/03
7
Operating Spanner Modules at Modbus TCP
7.1
Implemented Modbus Functions
TBEN-L…-EN1 and FEN20-EN1 support the following functions for accessing process data, parame-
ters, diagnostics and other services.
7.2
Modbus TCP – Process Data Mapping
Function codes
No.
Function
Description
3
Read Holding Registers
Reading multiple output registers
4
Read Input Registers
Reading multiple input registers.
6
Write Single Register
Writing a single output register.
16
Write Multiple Registers
Writing multiple output registers.
23
Read/Write Multiple Registers
Reading and writing of multiple registers
Fig. 22: Web server – Modbus TCP data mapping
