Commissioning
12.4 Operating and system states
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
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SYNCUP system state
Synchronization in the SYNCUP system state ensures that the two CPUs can operate
redundantly. With the SYNCUP system state, the redundant system switches from RUN-Solo
to the RUN-Redundant system state. Afterwards, both CPUs synchronously process the same
user program.
Starting SYNCUP
The initial situation is the RUN-Solo system state. The primary CPU of a redundant system is in
the RUN operating state and the backup CPU is in the STOP operating state.
The operating states are shown on the displays:
Table 12- 4 Starting SYNCUP
Start SYNCUP by:
• Starting the backup CPU via the PG/PC/HMI device or the display, and the mode selector is
set to RUN.
or
• You switch the mode selector on the backup CPU from STOP to RUN.
or
• You POWER ON the backup CPU (mode selector to RUN).
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