Mb_Client Example 3: Output Image Write Request; Mb_Client Example 4: Coordinating Multiple Requests - Siemens SIMATIC S7 System Manual

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105BCommunication processor

12.5 Modbus communication

MB_CLIENT example 3: Output image write request

This example shows a Modbus client request to write the S7-1200 output image.

Network 1: Modbus function 15 - Write S7-1200 output image bits

You must ensure that each individual Modbus TCP request finishes execution. This

coordination must be provided by your program. The example below shows how the outputs

of the first and second client requests can be used to coordinate execution.

The example shows both clients writing to the same memory area. Also, a returned error is

captured which is optional.

Network 1: Modbus function 3 - Read holding register words

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

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Simatic s7-1200