Siemens SIMATIC S7-1200 System Manual page 1123

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The following diagrams show the relationship of the output values to REQ. This assumes

that the instruction is called periodically to check for the status of the transmission process.

In the diagram below, it is assumed that the instruction is called every scan (represented by

the STATUS values).

The following diagram shows how the DONE and STATUS parameters are valid for only one

scan if the REQ line is pulsed (for one scan) to initiate the transmit operation.

The following diagram shows the relationship of DONE, ERROR and STATUS parameters

when there is an error.

The DONE, ERROR and STATUS values are only valid until Send_P2P executes again with

the same instance DB.

S7-1200 Programmable controller

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

Communication processor and Modbus TCP

13.3 Point-to-point (PtP) communication