CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
223
Replacement of failed 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 again.
Replacement of central components
13.1.1
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 t
he 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 firmware in
-alone operation (Page 146).
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