Siemens SIMATIC CP 340 - Page 123

Communication using function blocks
6.6 Delete receive buffer, FB12 "P_RESET"
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
123
Time sequence chart for the P_RESET FB
The figure below illustrates the behavior of the DONE and ERROR parameters depending
on the input circuit of REQ.
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Figure 6-5 Time sequence chart for the P_RESET 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.