Application planning
6.4 Redundancy scenarios
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
183
Diagnostics
System state, operating states and error displays after the failure of a redundancy connection:
• Redundant system → RUN-Redundant system state
• Primary CPU/Backup CPU → RUN-Redundant operating state
– MAINT LED → yellow light: There is only one redundancy connection remaining in the
H system.
Failure of the redundant system
If the primary CPU fails in addition to the redundancy connection, the backup CPU switches
to the STOP operating state. You can find more information in the section Failure of one
redundancy connection and the primary CPU in S7-1500H (Page 213).
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Replace the defective redundancy connection. You can find additional information on the
procedure in the section Replacing defective redundancy connections (Page 447).
6.4.7.2 Failure of both redundancy connections in S7-1500H > 55 ms apart
Introduction
The following redundancy scenario describes the effects of a defect in each of the two
redundancy connections in S7-1500H using a PROFINET ring as example. In this redundancy
scenario, the time between the redundancy connection failures is > 55 ms.
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