Siemens Simatic S7-1500H - Page 292

(2) Primary-backup switchover
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Figure 11-12Primary-backup switchover
Table 11-15Response to primary CPU error: Backup CPU becomes primary CPU and switches to RUN
No. in
diagram
CPU 1 System state CPU 2
Initial situation: The S7-1500R/H redundant system is in the RUN-Redundant system state.
The primary CPU (CPU 1) fails because of a hardware defect.
①
Following the failure, CPU 1 switches
from the RUN-Redundant operating
state to STOP or POWER OFF.
RUN-Redundant → RUN-Solo CPU 2 becomes primary CPU and switches
to the RUN operating state. The CPU
behaves like a standard CPU and contin
ues to process the user program.
Error elimination procedure for redundant operation
1.
Eliminate the error.
2.
Start CPU 1.
CPU1 becomes the backup CPU and switches from the STOP operating state to the SYNCUP
operating state.
Synchronization starts as detailed in the section SYNCUP system state (Page 270).
292
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
Commissioning
11.4 Operating and system states