Siemens SIMATIC CP 340 - Page 117

Communication using function blocks
6.4 Using function blocks for the output of message texts to a printer
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
117
Time Sequence Chart for FB 4 P_PRINT
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 6-4 Time Sequence Chart for FB 4 P_PRINT
Note
The REQ input is edge-triggered. A positive edge at the REQ input is sufficient. It does not
have to have a signal state of "1" during the entire transmission operation.