Failure and replacement of components during redundant operation
11.1 Failure and replacement of central components
CPU 410-5H Process Automation
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System Manual, 09/2014, A5E31622160-AB
11.1.3
Failure and replacement of an input/output or function module
Starting situation
Failure
How does the system react?
The CPU 410-5H is in redundant system mode
and an input/output or function module fails.
•
Both CPUs report the event in the diagnostic
buffer and via appropriate OBs.
Procedure
CAUTION
Note the different procedures.
Minor injury or damage to equipment is possible.
The procedure for replacing and input/output or function module differs for modules of the
S7-300 and S7-400.
Use the correct procedure when replacing a module. The correct procedure is described
below for the S7-300 in Chapter Failure and replacement of components of the distributed
To replace signal and function modules of an S7-400, perform the following steps:
Step
What to do?
How does the system react?
1
Disconnect the module from its peripheral
power supply, if necessary.
2
Disconnect the front connector and wiring.
•
If the affected module can generate
diagnostic interrupts and if diagnostic in-
terrupts are enabled as per configura-
tion, a diagnostic interrupt is generated.
•
Call OB 122 if you are accessing the
module by direct access
•
Call OB 85 if you are accessing the
module using the process image
3
Remove the failed module (in RUN mode).
•
Both CPUs generate a remove/insert
interrupt and enter the event in the di-
agnostic buffer and the system status
list.