Siemens SIMATIC S7-400H Manual page 212

Failure and Replacement of Components During Operation
10.1.5 Failure and Replacement of a Synchronization Submodule or
Fiber-Optic Cable
In this section three different error scenarios are to be differentiated:
• Failure of a synchronization submodule or fiber-optic cable
• Successive failure of the two synchronization submodules or fiber-optic cables
• Simultaneous failure of the two synchronization submodules or fiber-optic
cables
Initial situation
Failure of a Fiber–Optic or Synchronization
Module:
The S7-400H is in redundant system mode
and a fiber-optic cable or a synchronization
submodule fails.
Procedure
To replace a synchronization submodule or fiber-optic cable, perform the following
steps:
Step
1 Replace the fiber-optic cable first.
2 Start the standby CPU (e.g.
STOP³RUN or Start via programming
device).
3 Unplug the faulty synchronization
submodule from the standby CPU. To
do so, screw the threaded pin in the
additional front panel of the
synchronization submodule into the
thread of the module.
4 Insert the new synchronization
submodule in the standby CPU.
sure the rack number is set correctly.
5 Plug in the fiber-optic cable connections
of the synchronization submodules.
6 Start the standby CPU (e.g.
STOP³RUN or Start via programming
device).
10-8
Failure
What Has To Be Done?
1
How Does the System React?
•
Master CPU reports the event in the
diagnostics buffer and via OB 72.
•
Master CPU remains in RUN mode;
standby CPU goes into STOP
How Does the System React?
1
The following reactions are possible:
1. CPU goes into RUN mode.
2. CPU goes into STOP mode. In this
case continue with step 3.
Make
The following reactions are possible:
1. CPU goes into RUN mode.
2. CPU goes into STOP mode. In this
case continue with step 7.
Automation System S7-400H Fault-tolerant Systems
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A5E00068197-07