Communication processor and Modbus TCP
13.3 Point-to-point (PtP) communication
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1123
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.
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