Failure And Replacement Of An Input/Output Or Function Module - Siemens SIMATIC S7-400H Manual

Failure and Replacement of Components During Operation
9.1.3

Failure and Replacement of an Input/Output or Function Module

Initial situation
The S7-400H is in the Redundant system
mode and an input/output or function
module fails.
Procedure
To replace signal and function modules (central or remote), perform the following
steps:
Step
1 Disconnect the wiring.
2 Extract the failed module (in RUN
mode).
3 Insert the new module.
4 Connect the wiring.
9-6
Failure
What Has To Be Done?
S7-400H Programmable Controller Fault-Tolerant Systems
How Does the System React?
Both CPUs report the event in the
diagnostic buffer and via appropriate
OBs.
How Does the System React?
Call OB 82 if the module
concerned is
diagnosis-interruptible and
diagnostic interrupts are released
via the configuration.
– Call OB 122 if you are
accessing the module by direct
access
– Call OB 85 if you are accessing
the module by means of the
process image
Both CPUs process the
insert/remove-module interrupt
OB 83 in synchronism.
Both CPUs process the
insert/remove-module interrupt
OB 83 in synchronism.
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
diagnosis-interruptible and diagnostic
interrupts are released via the
configuration.
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