Specific Failure Scenarios With S7-1500H; Failure Of Both Redundancy Connections In S7-1500H ≤ 55 Ms Apart - Siemens SIMATIC S7-1500 System Manual

Application planning
5.5 Failure scenarios
Diagnostics
System state, operating states and error displays after the failure of the IO device in the
PROFINET-Ring and the STOP of Backup CPU:
• Redundant system → STOP system state
• Primary CPU → failed
• Backup CPU → STOP operating state
– MAINT LED → yellow light: The R-system is not in the RUN-Redundant system state. No
NOTE
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Replace the defective IO device and the defective primary CPU. You can find additional
information on the procedure in the sections Replacing defective R/H CPUs (Page 321) and
Replacing defective I/O devices/switches (Page 329).
NOTE
Proceed as follows if you have ensured that the CPU is still working in the STOP operating
state and can access all important IO devices:
1. Replace the defective IO device.
2. Switch the CPU from STOP operating state to the RUN operating state.
3. Replace the defective CPU. Switch the new CPU to the RUN operating state.
5.5.4

Specific failure scenarios with S7-1500H

5.5.4.1 Failure of both redundancy connections in S7-1500H ≤ 55 ms apart
Introduction
The following failure scenario describes the effects in case of a defect of the two redundancy
connections at S7-1500H using the example of a PROFINET ring. In this failure scenario, the
time between the redundancy connection failures is ≤ 55 ms.
134
partner CPU has been found in the R-system. The PROFINET ring is open.
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD