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

Failure and Replacement of Components During Operation
10.1.3

Failure and Replacement of an Input/Output or Function Module

Initial situation
The S7-400H is in 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
2
3
4
10-6
Failure
What Has To Be Done?
Disconnect the wiring.
Extract the failed module (in RUN
mode).
Insert the new module.
Connect the wiring.
How Does the System React?
•
Both CPUs report the event in the
diagnostics buffer and via appropriate
OBs.
How Does the System React?
•
Call OB 82 if the module
concerned is
diagnosis-interruptible and
diagnostics 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 diagnostics
interrupts are released via the
configuration.
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07