Replacing Defective Synchronization Module With S7-1500H; Replacing Both Defective Redundancy Connections With S7-1500H - Siemens SIMATIC S7-1500 System Manual

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.
13.1.3.3

Replacing defective synchronization module with S7-1500H

Initial situation
A synchronization module has failed.
The redundant S7‑1500H is in the RUN-Redundant system state.
Procedure: Replacing the synchronization module
Proceed as follows to replace a defective synchronization module:
1. Check the LEDs X3/X4 (CPU 1517H-3 PN) or LEDs X4/X5 (CPU 1518HF-4 PN) on the
primary and backup CPU. Locate the defective synchronization module on the basis of
which LEDs are off.
2. Replace the defective synchronization module. Connect the redundancy connection (fiber-
optic cable).
3. If the X3/X4 or X4/X5 LEDs remain off, replace the synchronization module on the other
CPU.
Result
The defective synchronization module has been replaced. The X3/X4 or X4/X5 LEDs flicker
yellow/green.
13.1.3.4

Replacing both defective redundancy connections with S7-1500H

Initial situation: Failure of both redundancy connections, one after the other
The two redundancy connections (fiber-optic cables) have been interrupted one after the
other (> 55 ms apart).
The S7‑1500H redundant system is in the RUN-Solo system state.
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
13.1 Replacing components of the S7-1500R/H redundant system
Maintenance
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