Siemens SIMATIC S7-400H System Manual page 270

Failure and replacement of components during operation
16.2 Failure and replacement of components during operation
Step
1
2
3
4
5
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What has to be done?
Disconnect the module from its peripheral
power supply, if necessary.
Disconnect the front connector and wiring.
Remove the failed module (in RUN mode).
Insert the new module.
Plug the front connector into the new
module.
How does the system react?
Call OB 82 if the module concerned is

capable of diagnostic interrupts and
diagnostic interrupts are enabled in the
configuration.
Call OB 122 if you are accessing the

module by direct access
Call OB 85 if you are accessing the

module using the process image
Both CPUs process the swapping

interrupt OB 83 synchronized with each
other.
Both CPUs process the swapping

interrupt OB 83 synchronized with each
other.
Parameters are assigned automatically

to the module by the CPU concerned
and the module is addressed again.
Call OB 82 if the module concerned is

capable of diagnostic interrupts and
diagnostic interrupts are enabled in the
configuration.
System Manual, 03/2012, A5E00267695-11
S7-400H