Maintenance
14.1 Replacing components of the S7-1500R/H redundant system
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
451
Result
The defective redundancy connections have been replaced. The redundant system switches
to the RUN-Redundant system state. The X3/X4 or X4/X5 LEDs flicker yellow/green.
Initial situation: Failure of both redundancy connections simultaneously
The two redundancy connections (fiber-optic cables) have been interrupted simultaneously
(≤ 55 ms apart).
Both H-CPUs are primary CPUs. The S7-1500H redundant system is in an undefined system
state.
Procedure: Replacing both redundancy connections
Proceed as follows to replace the defective redundancy connections:
1. Immediately switch an H-CPU to the STOP operating state.
2. Replace the redundancy connections (fiber-optic cables) one after the other.
3. Switch the H-CPUs back to the RUN operating state.
Result
The redundant system switches to the RUN-Redundant system state. The X3/X4 or X4/X5 LEDs
flicker yellow/green.
14.1.4 Replacing defective PROFINET cables
Initial situation
The PROFINET ring has been interrupted at any given point. The MAINT LEDs on both CPUs
are yellow. The following is shown on the S7-1500R display: Single pairing with information
on interface and port.
The S7-1500R/H redundant system is in the RUN-Redundant system state.
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