Maintenance
14.1 Replacing components of the S7-1500R/H redundant system
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
449
Initial situation: Failure of two PROFINET cables simultaneously
Two PROFINET cables in the PROFINET ring have been interrupted at two points
simultaneously (≤ 1500 ms apart).
Both R-CPUs are primary CPUs. The S7-1500R redundant system is in an undefined system
state.
Procedure: Replacing the two PROFINET cables
Proceed as follows to replace the defective PROFINET cables:
1. Immediately switch both R-CPUs to the STOP operating state.
2. Locate the defective PROFINET cables in the PROFINET ring.
3. Replace the PROFINET cables, one after the other.
4. Then start the R-CPUs.
Result
The redundant system switches to the RUN-Redundant system state.
14.1.3.2 Replacing a defective redundancy connection with S7-1500H
Initial situation
One redundancy connection (fiber-optic cable) has been interrupted. Display shows: Single
pairing with information on interface and port.
The S7-1500H redundant system is in the RUN-Redundant system state.
Procedure: Replacing the redundancy connection
Proceed as follows to replace a defective redundancy connection:
1. Check the LEDs X3/X4 (CPU 1517H-3 PN) or LEDs X4/X5 (CPU 1518HF-4 PN). You can
pinpoint the defective redundancy connection on the basis of which LEDs are off.
2. Check the redundancy connection that you have located with the LEDs.
3. If the redundancy connection is defective, replace the fiber-optic cable.
Result
The defective redundancy connection has been replaced. The X3/X4 or X4/X5 LEDs flicker
yellow/green.
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