CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
185
Failure and replacement of components during
redundant operation
Note
Components in redundant mode
Only components with the same product version, the same article number and the same
version can be operated redundantly.
If a component is no longer available as spare part, you must replace both components so
that this condition is met once aga
in.
Failure and replacement of central components
11.1.1
Failure and replacement of a CPU during redundant operation
Starting situation for replacement of the CPU
How does the system react?
The S7-400H is in redundant system mode and a
fails.
• The partner CPU switches to single mode.
• The partner CPU reports the event in the
diagnostic buffer and in OB 72.
Requirements for replacement
The module replacement described below is possible only if the "new" CPU
● has the same operating system version as the failed CPU and
● if it is equipped with the same system expansion card as the failed CPU.
Note
New CPUs are always shipped with the latest operating system version. If this differs
from the version of the operating system of the remaining CPU, you will have to equip the
new CPU with the same version of the operating system. Download the required
operating system via HW Config with "PLC
-> Update Firmware", see chapter Updating
(Page 144).
If the replacement CPU has already been in operation, reset it first to the delivery state.
This ensures that there are no address conflicts at the PN interfaces. See section
Resetting the CPU410
-5H to factory settings (Page 141)
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