Application planning
6.5 Failure scenarios
S7-1500R/H redundant system
218 System Manual, 01/2024, A5E41814787-AF
Diagnostics
System state, operating states and error displays after failure:
• Redundant system → STOP system state
• Primary CPU/Backup CPU → STOP operating state
– MAINT LED → yellow light: The H-system is not in the RUN-Redundant system state
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Check the user program (e.g. for write access to the F-data from the standard user program).
6.5.4.5 Failure of an interface module in an R1 device and of the PROFINET lines in two
places of a PROFINET ring.
Introduction
The following failure scenario describes the effects of the failure of an interface module in an
R1 device and defect of the PROFINET lines at two locations of a PROFINET ring.
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