Siemens CPU 410-5H Process Automation System Manual page 103

Result:
The operating state of the selected CPU can be identified based on the display of the
selected CPU in the "Diagnose hardware" dialog:
CPU icon
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
Operator controls and operating modes of the CPU 410-5H
Operating state of the respective CPU
Master CPU is in RUN operating state
Standby CPU is in RUN operating state
Master CPU is in STOP operating state
Standby CPU is in STOP operating state
Master CPU is in STARTUP operating state
Standby CPU is in LINK-UP or UPDATE operating state
Standby CPU is in ERROR-SEARCH operating state
Master CPU or a module whose parameters it assigned is faulty.
Standby CPU or a module whose parameters it assigned is faulty
Maintenance required on master CPU
Maintenance required on standby CPU
Maintenance request on master CPU
Maintenance request on standby CPU
7.2 System states of the redundant CPU 410-5H
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