Failure and Replacement of Components During Operation
10-10
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Initial situation
Failure How Does the System React?
Simultaneous Failure of a Fiber–Optic or
Synchronization Module:
The S7-400H is in redundant system mode
and both fiber-optic cables or
synchronization submodules fail.
• Both CPUs report the event in the
diagnostics buffer and via OB 72.
• Both CPUs become the master CPU and
remain in RUN mode.
Procedure
The double error described results in loss of redundancy. In this event proceed as
follows:
Step What Has To Be Done? How Does the System React?
1 Switch off a subsystem. -
2 Replace the faulty components. -
3 Turn the subsystem back on. LEDs IFM1F and IFMF2F go out. The
standby LED lights.
4 Start the CPU (e.g. STOP³RUN or
Start via programming device).
• CPU performs automatic LINK-UP
and UPDATE.
• CPU changes to RUN (Redundant
system mode) and now operates
as the standby CPU.
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