Failure and replacement of components during redundant operation
11.1 Failure and replacement of central components
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
193
11.1.6
Failure and replacement of an IM 460 and IM 461 interface module
Starting situation
Failure
How does the system react?
The S7-400H is in redundant system mode and
an interface module fails.
•
The connected expansion unit is turned off.
•
Both CPUs report the event in the diagnostic
buffer and via OB 86.
Procedure
Follow the steps below to replace an interface module:
Step
What has to be done?
How does the system react?
1
Turn off the power supply of the central
rack.
•
The partner CPU switches to single
mode.
2
Turn off the power supply of the expansion
unit in which you want to replace the inter-
face module.
–
3
Remove the interface module.
–
4
Insert the new interface module and turn
the power supply of the expansion unit
back on.
–
5
Switch the power supply of the central unit
back on and start the CPU.
•
The CPU performs an automatic LINK-
UP and UPDATE.
•
The CPU changes to RUN and operates
as the reserve CPU.