Application planning
6.5 Failure scenarios
S7-1500R/H redundant system
222 System Manual, 01/2024, A5E41814787-AF
4. The S1 devices in PROFINET ring 1 are no longer accessible by the new primary CPU. The S1
devices return to the substitute values.
5. The failure of the primary CPU affects the process, since the S1 devices in the PROFINET ring
1 can no longer be accessed from the primary CPU.
Diagnostics
System state, operating states and error displays after primary-backup switchover:
• Redundant system → RUN-Solo system state
• Primary CPU (previously backup CPU) → RUN operating state
– MAINT LED → yellow light: The H-system is not in the RUN-Redundant system state. No
partner CPU has been found in the redundant system.
– ERROR LED → flashes red: One or more IO devices have failed.
• Backup CPU (previously primary CPU) → failed
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Replace the defective CPU. You can find additional information on the procedure in the
section Replacing defective R/H CPUs (Page 446).
6.5.4.7 Failure of PROFINET lines in two places in a line topology with S2 devices
Introduction
The following failure scenario describes the effects of a defect in the PROFINET lines at two
points in a line topology with S2 devices.
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