Siemens SIMATIC ET 200SP System Manual page 205

Operating principle with BusAdapter/CM DP module
It is not permitted to remove or insert the BusAdapter/CM DP module when the supply
voltage is switched on. If you remove the BusAdapter/CM DP module unintentionally after
startup of the CPU, the supply voltage of the BusAdapter/CM DP module is switched off
automatically. To switch on the supply voltage again, you need to perform a
POWER OFF/POWER ON after inserting the BusAdapter/CM DP module.
Operating principle with ST, BA interface module
1. You can remove one I/O module during operation. If you remove another I/O module, this
results in a station stop of the ET 200SP distributed I/O system:
– All I/O modules of the ET 200SP distributed I/O system fail → substitute value
– The interface module continues to exchange data with the IO controller and report
2. If you insert all but one of the I/O modules withdrawn during operation, all I/O modules will
start up again.
Note
I/O modules inserted in empty slots and then removed are also regarded as withdrawn
during operation.
3. After a POWER OFF/POWER ON of the supply voltage 1L+ of the interface module, all
available I/O modules start up again in keeping with the configuration. The evaluation of
the I/O modules removed during operation starts again (see 1).
Distributed I/O system
System Manual, 12/2015, A5E03576849-AF
behavior.
diagnostics.
Note
If you want to replace several I/O modules during operation, you must replace them
one after the other.
12.1 Removing and inserting I/O modules
Maintenance
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