Siemens SIMATIC CPU 410 System Manual page 224

Replacement of failed components during redundant operation
13.1 Replacement of central components
Caution when replacing a CPU
If you reuse a CPU that has previously been used at a different location, ensure that the
contents backed up in the load memory cannot pose a hazard at the new point of use.
Reset the CPU to factory settings if its previous use is unknown.
See Resetting the CPU 410 to delivery condition (reset to factory setting) (Page 142)
Procedure
Note
Replacing an SEC
You can replace an SEC by following the same procedure as described above. Here you do
not replace the CPU in step 2, but replace the SEC with an SEC of the same size and then
reinstall the CPU.
Follow the steps below to replace a CPU:
Step
1
2
3
4
5
6
7
224
CAUTION
What to do?
Turn off the power supply module.
Replace the CPU. Make sure the rack num-
ber is set correctly on the CPU.
Insert the synchronization modules.
Plug in the fiber-optic cable connections of
the synchronization modules.
Switch the power supply module on again.
Perform a CPU memory reset on the re-
placed CPU.
Start the replaced CPU (for example, STOP-
RUN or Start using the PG).
How does the system react?
The entire subsystem is switched off
•
(system operates in single mode).
–
–
–
CPU runs the self-tests and changes to
•
STOP.
–
The CPU performs an automatic LINK-
•
UP and UPDATE.
The CPU changes to RUN and operates
•
as the standby CPU.
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC