Failure And Replacement Of A Synchronization Module Or Fiber-Optic Cable - Siemens SIMATIC PCS 7 System Manual

Failure and replacement of components during redundant operation
11.1 Failure and replacement of central components
Proceed as follows to replace a communication module for PROFIBUS or Industrial
Ethernet:
Step
1
2
3
11.1.5

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 both synchronization modules or fiber-optic cables
● Simultaneous failure of both fiber-optic cables
The CPU indicates by means of LEDs and diagnostics 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 must go out.
If one of the IFM LEDs continues to be lit even after you have replaced the relevant
synchronization modules, the synchronization cables and even the standby CPU, there is an
error in the master CPU. In this case, you can, however, switch to the standby CPU by
selecting the "via only one intact redundancy link" option in the "Switch" STEP 7 dialog box.
Starting situation
Failure
Failure of a fiber-optic cable or synchronization
module:
The S7-400H is in redundant system mode and a
fiber-optic cable or synchronization module fails.
See also chapter Synchronization modules for
the CPU 410-5H (Page 189).
178
What has to be done?
Remove the module.
Insert the new module.
Turn the module back on.
How does the system react?
Both CPUs process the swapping inter-
•
rupt OB 83 synchronized with each other.
Both CPUs process the swapping inter-
•
rupt OB 83 synchronized with each other.
The module is automatically configured by
•
the appropriate CPU.
The module resumes communication
•
(system establishes communication con-
nection automatically).
How does the system react?
The master CPU reports the event in the
•
diagnostic buffer and with OB 72 of OB 82.
The standby CPU switches to ERROR-
•
SEARCH operating state for a few minutes. If
the error is eliminated during this time, the re-
serve CPU switches to redundant system
mode, otherwise it switches to STOP.
One of the two LEDs Link1 OK or Link2 OK is
•
lit
One of the two LEDs IFM1F or IFM2F is lit
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB