Siemens Simatic S7-300 CP 341 User Manual page 146

Communication via Function Blocks
6.4 Using the Function Blocks with the RK 512 Computer Connection
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.
146
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CP 341 Point-to-Point Communication, Installation and Parameter Assignment
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Manual, 09/2008, A5E02191071-01