Siemens Simatic S7-300 CP 341 User Manual page 154

Communication via Function Blocks
6.4 Using the Function Blocks with the RK 512 Computer Connection
Time sequence chart of FB P_RCV_RK
The figure below illustrates the behavior of the NDR, LEN, and ERROR parameters
depending on the input circuit of EN_R and R.
Figure 6-5
Note
The EN_R input remain static at "1". The EN_R parameter must be supplied with result of
logic operation "1" during the entire receive request.
154
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Time sequence chart of FB 7 P_RCV_RK for "Provide data" request
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
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Manual, 09/2008, A5E02191071-01