Failure And Replacement Of An Input/Output Or Function Module - Siemens SIMATIC PCS 7 System Manual

Failure and replacement of components during redundant operation
11.1 Failure and replacement of central components
11.1.3

Failure and replacement of an input/output or function module

Starting situation
Failure
The CPU 410-5H is in redundant system mode
and an input/output or function module fails.
Procedure
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
I/Os (Page 181).
To replace signal and function modules of an S7-400, perform the following steps:
Step
1
2
3
176
CAUTION
What to do?
Disconnect the module from its peripheral
power supply, if necessary.
Disconnect the front connector and wiring.
Remove the failed module (in RUN mode).
How does the system react?
Both CPUs report the event in the diagnostic
•
buffer and via appropriate OBs.
How does the system react?
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
Both CPUs generate a remove/insert
•
interrupt and enter the event in the di-
agnostic buffer and the system status
list.
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB