Siemens Simatic S7-1500R - Page 62

Cycle and response times of the S7-1500R/H redundant system
5.3 Influences on the cycle time of the S7-1500R/H redundant system
Cycle and response times
Function Manual, 10/2018, A5E03461504-AD
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Execution of the cyclic program (CP with priority 1) is complete. While the primary CPU waits
for the end of the cycle of the backup CPU, a higher priority OB (OB 30 with priority 7) starts.
The primary CPU starts the next cycle as soon as the following conditions have been
fulfilled:
● The primary CPU has received the message from the backup CPU that the backup CPU
has finished processing the cyclic program.
● The primary CPU has processed OB 30 and updated PIPQ1.
Note
Due to the change of the run level and the synchronization, interruptions of the program
cycle by higher
-
priority OBs result in a higher load. Interruptions of the program cycle extend
the cycle time.