ABB i-bus KNX Product Manual page 111

®
ABB i-bus KNX
© 2008 ABB STOTZ-KONTAKT GmbH
Planning and application
Special function: Restore state
A useful special function can be assigned to Preset 1. It is thus possible to
recreate the brightness level (states) which were present before retrieving
the first preset recall. The recall can be implemented via Preset 2, 3 or 4.
The following diagram clarifies this:
Recall initial state
before first preset
recall
Recall preset 2
Restore old state by recall
of preset 1
This function can be used for example after a presentation to restore
the lighting to the state it was in beforehand.
With the first recall of a preset the current state of the output is stored.
If a preset was already active the saved state will not be overwritten.
This ensures that the state before the first preset recall can be re-
established. If the preset is recalled more often, the state of the first recall
applies.
After the command restore value before first preset call has been recalled,
the current state will be stored with the next preset recall in order to recall it
again at a later time.
A similar behaviour applies for preset 3 and 4 with the objects Set preset 3
and 4 and Recall preset 3 and 4
Lamp 1 Lamp 2
ON OFF
OFF ON
ON OFF
Lamp 3
ON
ON
ON
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