Diagnostics
System state, operating states and error displays after the failure of the PROFINET cable:
•
Redundant system → RUN-Redundant system state
•
Primary CPU/Backup CPU → RUN-Redundant operating state
–
MAINT LED → yellow light: The PROFINET ring is open. There is only one redundancy
connection remaining in the redundant system.
WARNING
Failure of the redundant system S7-1500R
If the primary CPU fails in addition to the PROFINET cable, the backup CPU switches to the
STOP operating state. You can find more information in the section Failure of the primary
CPU when IO devices have failed in the PROFINET ring (Page 132).
NOTE
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Replace the defective PROFINET cable or reconnect the disconnected PROFINET cable. You
can find additional information on the procedure in the section Replacing defective PROFINET
cables.
5.4.5 Specific redundancy scenarios for S7-1500H
5.4.5.1 Failure of a redundancy connection in S7-1500H
Introduction
The following redundancy scenario describes the effects of a defective redundancy
connection on S7-1500H using the example of a PROFINET ring.
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S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
Application planning
5.4 Redundancy scenarios
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