Removal And Insertion Of Modules During Operation - Siemens SIMATIC ET 200S Manual

Functions of the IM 151-7 CPU
8.14

Removal and insertion of modules during operation

Removing and inserting one module at a time in the case of the IM 151-7 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.
Removal and insertion of modules in an energized state and during operation
When removing and inserting modules in an energized state and during operation,
refer both to the specifications in the manual and to the restrictions in the manual
ET 200S Distributed I/O System, Section: "Wiring and fitting".
Warning
!
When an output module is inserted, the outputs set by the user program become
active immediately. We therefore advise you to set the outputs to "0" in the user
program before removing the module.
If you do not remove and insert modules correctly (see the manual: ET 200S
Distributed I/O System, Chapter: "Wiring and fitting".) the system could
malfunction. Adjacent modules could be affected.
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
irrespective of whether the power module is switched on or off.
If OB 83 is in the memory of the CPU, the IM 151-7 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 151-7 CPU remains in RUN.
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ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
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