Siemens SIMATIC S7-400H - Failure and Replacement of an IM 460 and IM 461 Interface Module

Failure and Replacement of Components During Operation
10-11
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
10.1.6 Failure and Replacement of an IM 460 and IM 461 Interface
Module
The IM 460 and IM 461 interface modules make it possible to connect expansion
racks.
Initial situation
Failure How Does the System React?
The S7-400H is in redundant system mode
and one interface module fails.
• Connected expansion unit is turned off.
• Both CPUs report the event in the
diagnostics buffer and via OB 86.
Procedure
To change an interface module, perform the following steps:
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 interface module.
-
3 Extract 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
rack back on and start the CPU.
• CPU performs automatic LINK-UP
and UPDATE.
• CPU changes to RUN and
operates as the standby CPU.