Functions
8.5 System modification during operation
ET 200M
166 Operating Instructions, 12/2008, EWA-4NEB780600602-08
8.5.2 System modification in a redundant system
Configuring with
STEP 7
/
PCS 7
Information on using this function in the redundant structure can be found in the "S7-400H
automation system, fault-tolerant systems
(http://support.automation.siemens.com/WW/view/en/1186523
)" manual and in the online
help for the H-optional package for
STEP 7
.
Configuring with a GSD file
Principle
As of IM 153-2Bx00 it is also possible to modify the system whilst running by configuring with
a GSD 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 such a reconfiguration, the two IM 153-2 work temporarily with different configuration
data. The redundant operating mode for the unaffected modules is, however, retained.
Requirements
● "Module change in operation" must be enabled during configuration. This must take place
equally for both IM 153-2 of the redundant system. If this is not the case, an IM 153-2
does not start up, i.e. redundant operation is not possible.
Note
If "Module Change During Operation" is not cleared, the configuration and parameter
settings between the two IM 153-2 must be identical.
● The "Start-up at preset configuration ≠ actual configuration" and "Module Change During
Operation" parameters must be cleared with both IM 153-2s.
● 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.
Controlling
● The configuration of the currently active IM 153-2 applies to the I/O modules of an ET
200M.
● If there is a difference in the configuration of the two IM 153-2, the passive IM 153-2
supplies as input data the fixed value "zero" for all inputs. Only when the configuration is
equal does the passive IM 153-2 start to deliver the true input data again.
Configuration modification procedure
Reconfiguration is performed in the following way (example):
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