System And Operating State Transitions - Siemens SIMATIC S7-1500 System Manual

Cause of SYNCUP abort
In the PROFINET ring, in addition to the two CPUs, there are
other devices with the media redundancy role "Manager" or
"Manager (auto)".
In a configuration with PROFINET rings (R1), the backup CPU
is assigned the media redundancy role "Not device in the ring"
before the SYNCUP.
Supply voltage of the primary or backup CPU has failed.
Simultaneous POWER OFF / POWER ON switching at both CPUs
during SYNCUP:
If you switch both CPUs POWER OFF/ON at the same time dur­
ing SYNCUP, SYNCUP will be aborted.
See also
Resetting CPUs to factory settings (Page 338)
11.4.7

System and operating state transitions

System state transitions
The following figure shows the system state transitions of the redundant S7‑1500R/H system.
Figure 11-9 System state transitions
Operating state transitions
Operating state transitions of the redundant system
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
11.4 Operating and system states
Solution
Configure the media redundancy role "Client" for all other
devices in the PROFINET ring.
Delete the SIMATIC Memory Card of the backup CPU.
Restore the supply voltage. Replace a defective load current
supply (PM).
Switch both CPUs POWER OFF/ON again. The SYNCUP is
executed again.
Commissioning
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