Siemens SIMATIC S7-1200 - Page 1189

Communication processor and Modbus TCP
13.5 Modbus communication
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
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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