Replacement of failed components during redundant operation
13.2 Replacement of components of the distributed I/O on PROFINET IO
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
231
13.1.6
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.
13.2
Replacement of components of the distributed I/O on PROFINET IO
13.2.1
Replacement of a PROFINET IO device
Starting situation
Failure
How does the system react?
The S7-400H is in the redundant system state
and an IO device fails.
Both CPUs signal the event in the diagnostics
buffer and via a corresponding OB.