ABB i-bus
®
KNX
Planning and application
© 2008 ABB STOTZ-KONTAKT GmbH
227
4.3.2.3
Determination of the
current position
Reference movement
The Room Master permanently determines the current position of the shutter
as well as the position of the shutter angle based on the duration of the
individual movement actions. Over extended periods slight inaccuracies can
occur in the determination of the position for different reasons. For this
reason the Room Master uses the upper and lower end positions for unique
determination of the current position of the shutter. Every time when the
shutter is in the upper end position, the position is updated in the memory of
the Room Master.
If the end positions are not reached in normal operation, a reference
movement which is fully upwards or fully downwards can be performed via a
telegram. After a reference movement the shutter remains in the reference
position or moves back to the stored position as specified in the
programming.
Direct and indirect movement to the position
Via the parameter
Move to position
you can set if the shutter moves from its
current position either directly to the target position, or if each movement
should perform a reference movement
indirectly via a start position
(upper
end position or lower end position) to the target position.
4.3.2.4
Move to position
in % [0…100]
The shutter can be moved into any position via an 8 bit value. In the
Shutter
operating mode, the louvres can also be positioned into any angle via an
8 bit value.
In this way, it can be decided for each movement command which position
the shutter should move to. For example, it is possible to set the position
from a display unit or a visualisation terminal directly using a value.
