Functions of the IM 151/CPU
5-20
ET 200S Interface Module IM 151/CPU
A5E00058783-01
5.9 Removal and Insertion of Modules During Operation
Removing and inserting one module at a time in the case of the IM 151/CPU with
local ET 200S I/Os is possible during operation and in an energized state.
Exceptions
The CPU itself must not be removed during operation and in an energized state.
What Happens when Modules are Removed During Operation
When you remove a module from the ET 200S I/O system during operation, OB 83
is called and a corresponding diagnostic buffer entry is created (event ID 3861
H
),
irrespective of whether the power module is switched on or off.
If OB 83 is in the memory of the CPU, the IM 151/CPU remains in RUN.
The absence of the module is noted in the system status list.
If the module that has been removed is accessed from the user program, an I/O
access error occurs with a corresponding entry in the diagnostic buffer. In addition,
OB 122 is called.
If OB 122 is in the memory of the CPU, the IM 151/CPU remains in RUN.
What Happens when Modules are Inserted During Operation
If you reinsert a module that has been removed in the ET 200S I/O system during
operation, the CPU carries out a preset/actual comparison for the inserted module.
This compares the configured module with the one that is actually inserted. The
following activities occur depending on the result of the preset/actual comparison:
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