Siemens SIMATIC S7-400H System Manual page 193

Step
8
9
10
Note
If both fiber-optic cables or synchronization modules are damaged or replaced one after the
other, the system reactions are the same as described above.
The only exception is that the standby CPU does not change to STOP but instead requests
a memory reset.
Starting situation
Failure
Failure of both fiber-optic cables or
synchronization modules:
The S7-400H is in redundant mode and both
fiber-optic cables or synchronization modules fail.
Procedure
The double error described results in loss of redundancy. In this event proceed as follows:
Step
1
2
3
4
Failure and replacement of an IM 460 and IM 461 interface module
The IM 460 and IM 461 interface modules provide functions for connecting expansion modules.
S7-400H
System Manual, 09/2007, A5E00267695-03
13.2 Failure and replacement of components during operation
What needs to be done?
Insert the new synchronization module
into the master CPU.
Plug in the fiber-optic cable
connections of the synchronization
modules.
Start the standby CPU (for example,
STOP-RUN or Start using the PG).
What needs to be done?
Switch off one subsystem.
Replace the faulty components.
Turn the subsystem back on.
Start the CPU (for example Start from
programming device or STOP³RUN).
Failure and replacement of components during operation
How does the system react?
Master CPU processes insert/remove-module
•
interrupt OB 83 and redundancy error OB 72
(exiting state).
–
CPU performs automatic LINK-UP and
•
UPDATE.
CPU changes to RUN (redundant mode) and
•
operates as the standby CPU.
How does the system react?
Both CPUs report the event in the diagnostic
•
buffer and with OB 72.
Both CPUs become the master CPU and
•
remain in RUN mode.
The diagnostic LED on the synchronization
•
module is lit.
How does the system react?
–
–
LEDs IFM1F and IFMF2F go off. The standby
•
LED lights up.
CPU performs automatic LINK-UP and
•
UPDATE.
CPU changes to RUN (redundant mode) and
•
operates as the standby CPU.
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