Siemens SIMATIC PCS 7 CPU 410-5H System Manual page 162

System modifications during redundant operation
10.3 Adding components
Reaction to monitoring timeout
If one of the monitored times exceeds the configured maximum, the update is canceled. The
fault-tolerant system remains in single mode with the previous master CPU and, assuming
certain conditions are met, attempts the link-up and update later. For additional information,
refer to section Time monitoring (Page 123).
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CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB