Fandilure Andnd Replandcement Of And Synchronizandtion Submodule Or Fiber-Optic Candble - Siemens SIMATIC S7-400H Manual

Failure and Replacement of Components During Operation
9.1.5 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 synchronization submodule or
fiber-optic cable:
The S7-400H is in the 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 – for example,
STOP RUN 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 – for example,
STOP RUN or Start via programming
device.
9-8
Failure
What Has To Be Done?
1
1
Make
S7-400H Programmable Controller Fault-Tolerant Systems
How Does the System React?
Master CPU reports the event in the
diagnostic buffer and via OB 72.
Master CPU remains at RUN; standby
CPU goes to STOP
How Does the System React?
-
The following reactions are possible:
1. CPU goes to RUN mode.
2. CPU goes to STOP mode. In this
case continue with step 3.
-
-
-
The following reactions are possible:
1. CPU goes to RUN mode.
2. CPU goes to STOP mode. In this
case continue with step 7.
A5E00068197-04