Siemens SIMATIC ET 200M Manual page 52

Configuration modification procedure
Reconfiguration is performed in the following way (example):
1. Make the appropriate modifications to the configuration offline (remove or add
module).
Note
The parameters of a module can only be changed by making two configuration
modifications in RUN:
1. Remove the module.
2. Add the module with new parameters.
3. Switch one master of the redundant system to passive (all slaves are active at
the other master).
4. Load the configuration in the master on the passive line and restart the
master →
The parameters and configuration data are loaded in the slave.
5. Switch over to the line with the new configuration →
The previously loaded configuration now becomes effective. Removed modules
are taken out of the data communication and added modules with the new
parameters are included in the data communication.
6. The changes are checked by the user.
If the changes are OK, the new configuration must also be loaded in the second
master. If the changes are not OK, the previous status can be restored by
switching over to the second master (with the old configuration). In this case,
the old configuration must be loaded on the first master again.
Note
A reconfigured module can be removed and inserted both before and after
configuration modification in RUN. The module does not become available for the
process until it has actually been inserted and the IM 153-2 which contains the
configuration for the module is active.
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
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Configuration Options with the ET 200M
3-13