Siemens Simatic S7-300 CP 341 - Page 139

Communication via Function Blocks
6.3 Using the Function Blocks with the 3964(R) Procedure
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01 139
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.
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Figure 6-2 Time sequence chart of FB 7 P_RCV_RK
Note
Input EN_R must be set to static "1" state. The EN_R parameter must be supplied with result
of logic operation "1" during the entire receive request.
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