Siemens SIMATIC S7-400 CP 440 - Figure 6-1 Time Sequence Chart for the 10 SEND

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Communication via Function Blocks

6.3 Using the Function Blocks

Point-to-point connection CP 440 Installation and Parameter Assignment

Manual, 09/2007, A5E00057742-03

Time Sequence Chart for the SEND_440 FB

The figure below illustrates the behavior of the DONE and ERROR parameters, depending

on how the REQ and R inputs are wired.

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Figure 6-1 Time sequence chart for the 10 SEND_440 FB

Note

The REQ input is edge-triggered. A positive edge at the REQ input is adequate. It is not

required that the RLO (result of logical operation) is "1" during the whole transmission

procedure.

Siemens SIMATIC S7-400 CP 440 - Figure 6-1 Time Sequence Chart for the 10 SEND_440 FB