Siemens SIMATIC ET 200M Manual page 51

Configuration Options with the ET 200M
Configuration with Device Master File
Principle
With the IM 153-2Bx00, a configuration modification in RUN is also possible when
configuring with device master file. In this case, modules are added to or removed
from an ET 200M during operation. Existing modules and modules which are not to
be modified are unaffected.
During this reconfiguration process, the two IM 153-2 modules temporarily use
different configuration data. The redundant operating mode for the unaffected
modules is, however, retained.
Prerequisites
S "Configuration modification in RUN" must be enabled during configuration. This
must be performed for both IM 153-2 modules of the redundant system. If this
is not the case, one of the IM 153-2 modules will not start, i.e. redundancy
mode will not be possible.
Note
If configuration modification in RUN is not enabled, parameterization and
configuration must be identical for the two IM 153-2 modules.
S The parameters "Startup If Preset Configuration 0 Actual Configuration" and
"Module Change During Operation" must be enabled for both IM 153-2
modules.
S The slots for modules which are to be added must be available on the active
backplane bus. Adding or removing active bus modules is not possible during
operation.
Rules
S At the I/Os of an ET 200M, it is always the configuration of the currently active
IM 153-2 which is applicable.
S If there is a difference between the configurations of the two IM 153-2 modules,
the passive IM 153-2 delivers the fixed value "zero" as input data for all inputs.
The passive IM 153-2 does not deliver the real input data again until the
configurations are identical.
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Distributed I/O Device ET 200M
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