Siemens Simatic S7-300 CP 341 User Manual page 159

Time sequence chart of FB P_SND_RK
The figure below illustrates the behavior of the DONE and ERROR parameters depending
on the input circuit of REQ and R.
Figure 6-6
Note
The REQ input is edge-triggered. A positive edge at the REQ input is sufficient. The result of
the logic operation must not be at "1" at any point during transfer.
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01
www.gkbpx.com
6.4 Using the Function Blocks with the RK 512 Computer Connection
Time sequence chart of FB 8 P_SND_RK for "Fetch data" request
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Communication via Function Blocks
159