Communication via Function Blocks
6.6 Technical Specifications of the Function Blocks
Point-to-point connection CP 440 Installation and Parameter Assignment
Manual, 09/2007, A5E00057742-03
109
Minimum Number of CPU Cycles
The table below describes the minimum number of CPU cycles (FB/FC calls) required to
process a "minimum request" (32 bytes SEND/RECEIVE for the transported user data set
per program cycle). This applies only in centralized operation.
Table 6-10 Minimum Number of CPU Cycles
Number of CPU Cycles for Processing ...
Completion without error Completion with error RESET/RESTART
RECV_440 ≥ 2 ≥ 2 ≥ 3
SEND_440 ≥ 2 ≥ 2 ≥ 3
RES_RECV ≥ 2 ≥ 2 ≥ 3
Before the CP 440 can process an initiated job after the CPU has changed from STOP to
RUN mode, the CP-CPU startup mechanism SEND_440 must be completed. Any requests
initiated in the meantime do not get lost. They are transmitted once the startup coordination
with the CP 440 is finished.
Before the CP 440 can receive or submit a frame in the user program after a change in the
CPU mode from STOP to RUN, the CP-CPU startup mechanism RECV_440 must be
completed.
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