Siemens SIMATIC S7-1200 System Manual page 1189

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Example: MB_CLIENT 3: Output image write request

This example shows a Modbus client request that transfers bit data from local CPU memory

(starting at M1000.0) to a remote Modbus TCP server.

Network 1: Modbus function 15 - Write output bits in a Modbus server

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

Communication processor and Modbus TCP

13.5 Modbus communication