Siemens SIMATIC CPU 410 System Manual page 222

Plant changes during redundant operation - H-CiR
12.11 Re-parameterization of a module
Reaction to exceeding the monitoring times
When one of the monitored timers exceeds the configured maximum value, the update is
aborted and no master switchover is performed. The H system remains in solo mode with
the previous master CPU and attempts to later perform the master switchover under certain
conditions. For details, refer to the section Time monitoring (Page 120).
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CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC