Changing the system state:
On the R/H system control panel (Online & diagnostics):
•
STOP system state: Press the STOP R/H-System button.
Figure 11-13STOP system state on the R/H system control panel
On the CPU control panels (Online & diagnostics):
•
RUN-Redundant system state: Press the RUN R/H-System button on both CPU operator
panels.
NOTE
Please note that you cannot switch the S7-1500R/H system to the RUN-Redundant system
state over the R/H system control panel. You implement the RUN-Redundant system state
by switching each CPU on its control panel to RUN.
11.5 CPU memory reset
Basics of a memory reset
Memory resets can be performed for the primary and for the backup CPU. Memory resets are
generally only useful for the primary CPU.
Reason: Following a primary CPU memory reset, you need to trigger synchronization for
redundant operation. In SYNCUP, the backup CPU is synchronized with the retentive data
from the primary CPU. Following SYNCUP, the backup CPU processes the same user program
as the primary CPU.
The memory reset process for R/H-CPUs is identical to that for the S7-1500 standard CPUs.
The CPU must be in the STOP operating state for a memory reset.
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S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
Commissioning
11.5 CPU memory reset
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