Failure And Replacement Of A Synchronization Module Or Fiber-Optic Cable - Siemens SIMATIC S7-400H System Manual

Failure and replacement of components during operation
13.2 Failure and replacement of components during operation
13.2.5

Failure and replacement of a synchronization module or fiber-optic cable

In this section, you will see three different error scenarios:
● Failure of a synchronization module or fiber-optic cable
● Successive failure of the two synchronization modules or fiber-optic cables
● Simultaneous failure of the two synchronization modules or fiber-optic cables
The CPU displays by means of LEDs and by means of the diagnosis whether the lower or
upper redundant link has failed. After the defective parts (fiber-optic cable or synchronization
module) have been replaced, LEDs IFM1F and IFM2F go out.
Starting situation
Failure
Failure of a fiber-optic cable or synchronization
module:
The S7-400H is in redundant mode and a fiber-optic
cable or a synchronization module fails.
Procedure
Follow the steps below to replace a synchronization module or fiber-optic cable:
Step
1
2
3
4
5
6
7
192
What needs to be done?
First, check the fiber-optic cable.
Start the standby CPU (for example,
STOP-RUN or Start using the PG).
Remove the faulty synchronization
module from the standby CPU.
Insert the new synchronization module
in the standby 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).
If the standby CPU changed to STOP
in step 6:
Remove the synchronization module
from the master CPU.
How does the system react?
Master CPU reports the event in the diagnostic
•
buffer and with OB 72.
Master CPU remains in RUN mode; standby
•
CPU changes to STOP
The diagnostic LED on the synchronization
•
module is lit
How does the system react?
–
The following reactions are possible:
1. CPU changes to RUN mode.
2. CPU changes to STOP mode. In this case
continue at step 3.
–
–
The diagnostic LED on the synchronization
•
module goes off
Both CPUs report the event in the diagnostic
•
buffer
The following reactions are possible:
1. CPU changes to RUN mode.
2. CPU changes to STOP mode. In this case
continue at step 7.
Master CPU processes insert/remove-module
•
interrupt OB 83 and redundancy error OB 72
(entering state).
System Manual, 09/2007, A5E00267695-03
S7-400H