Failure And Replacement Of An Input/Output Or Function Module - Siemens CPU 410-5H Process Automation System Manual

Step
1
2
3
Note
Redundant power supply
If you use a redundant power supply (PS 407 10A R), two power supply modules are
assigned to one fault-tolerant CPU. If a part of the redundant PS 407 10A R power supply
module fails, the associated CPU keeps on running. The defective part can be replaced
during operation.
Other power supply modules
If the failure concerns a power supply module outside the central rack (e.g. in the expansion
rack or in the I/O device), the failure is reported as a rack failure (central) or station failure
(remote). In this case, simply switch off the power supply to the power supply module
concerned.
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.
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
Failure and replacement of components during redundant operation
What has to be done?
Turn off the power supply (24 V DC for PS
405 or 120/230 V AC for PS 407).
Replace the module.
Switch the power supply module on again.
11.1 Failure and replacement of central components
How does the system react?
The entire subsystem is switched off
•
(system operates in single mode).
–
The CPU executes the self-tests.
•
The CPU performs an automatic LINK-
•
UP and UPDATE.
The CPU changes to RUN (redundant
•
system mode) and operates as reserve
CPU.
How does the system react?
Both CPUs report the event in the diagnostic
•
buffer and via appropriate OBs.
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