Siemens SIMATIC S7-1500 System Manual page 225

If the maximum cycle time is exceeded for a second time in the same cycle, the redundant
system responds as described in the column "2nd time cycle time is exceeded". The
redundant system then resets the cycle time monitoring.
If the maximum cycle time is exceeded for a third time in the same cycle, the redundant
system responds as described in the column "3rd time cycle time is exceeded". The redundant
system then resets the cycle time monitoring (only when time error OB 80 is configured).
Table 9-4 Response of S7-1500R/H redundant system when cycle time is exceeded, without OB 80
Initial situation
System Primary CPU Backup CPU
RUN-Solo RUN
1)
SYNCUP RUN-Syncup
2)
SYNCUP RUN-Syncup
RUN- RUN-Redund­
Redundant ant
SYNCUP until snapshot of the work memory contents
1)
2) SYNCUP after snapshot of the work memory contents
Table 9-5 Response of S7‑1500R/H redundant system when cycle time is exceeded with OB 80
Initial situation
System Primary Backup
CPU CPU
RUN- RUN STOP
Solo
SYNCUP RUN-Syn­ SYNCUP SYNCUP RUN-Syn­
1) cup
SYNCUP RUN-Syn­ SYNCUP SYNCUP RUN-Syn­
cup
2)
RUN- RUN- RUN-
Redund­ Redund­ Redund­
ant ant ant
1) SYNCUP until snapshot of the work memory contents
SYNCUP after snapshot of the work memory contents
2)
Assignment between event source and OBs
The type of OB determines where you assign OB to event source:
• For hardware interrupts: Assignment in hardware configuration
• For all other OB types: Assignment when the OB is created, where applicable after you
have configured the event source
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
1st time cycle time is exceeded
System
STOP STOP
SYNCUP STOP
SYNCUP RUN-Solo
RUN-Redund­ RUN-Solo
ant
1st time cycle time is
exceeded
System Primary Backup
CPU
RUN- RUN
Solo + OB 80
SYNCUP
cup
+ OB 80
SYNCUP
cup + OB 80
+ OB 80
RUN- RUN-
Redund­ Redund­ Redund­
ant ant
+ OB 80 + OB 80
Primary CPU Backup CPU
STOP STOP
STOP STOP
RUN STOP
RUN STOP
2nd time cycle time is
exceeded
System Primary
CPU CPU
STOP STOP STOP
STOP STOP
RUN- RUN
Solo + OB 80
RUN- RUN- RUN
Solo + OB 80
ant
Basics of program execution
9.3 Events and OBs
2nd time cycle time is exceeded
System Primary CPU Backup CPU
--- ---
--- ---
STOP STOP
STOP STOP
3rd time cycle time is
exceeded
Backup System Primary
CPU CPU
STOP --- ---
STOP --- ---
STOP STOP STOP
STOP STOP STOP
---
---
STOP
STOP
Backup
CPU
---
---
STOP
STOP
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