ABB i-bus KNX Product Manual page 117

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ABB i-bus KNX
Planning and application
Block
The Block function can be used to move an output of the JRA/S in a targeted manner to a parameterized
position using a 1-bit telegram and disable operation. When the Block function is recalled, the blind/shutter
is moved to a parameterized position for blocking and operation is disabled. On rescinding, the
blind/shutter is moved to the parameterized position for rescinding of Weather alarm, Block or Forced
operation and operation is enabled.
Example
With appropriate parameterization, this function can be used to monitor a window. If the window is open,
then the operation of an inner blind/shutter (inner blind or roller blind).
Forced operation
Each blind/shutter can be moved individually to a forced position and operation disabled using a telegram
(1 bit or 2 bit). When Forced operation is activated, the output is also informed of the position to which the
blind/shutter should be moved. Operation of the blind/shutter is then disabled. When Forced operation is
rescinded, the blind/shutter is moved to the parameterized position for rescinding of Weather alarm, Block
or Forced operation and operation is enabled.
The Forced operation function is suitable, for example, for moving blinds and roller shutters upwards when
the windows are being cleaned. At the same time, operation of the blind/shutter is disabled to prevent the
cleaning personnel from being put at risk through unexpected movement.
Priority of safety functions
The Wind alarm, Rain alarm, Frost alarm, Block and Forced operation safety functions have priority over
every other function. If, therefore, one of these functions has been activated for an output, then the
operation of the output is disabled for other movements. A priority can be defined within the safety
functions, in order to control the blind/shutter in a targetted manner, if more than one safety function is
activated at the same time.
Example
A parameter is used to specify that the forced movement during window cleaning has priority over a
wind alarm, meaning that the cleaning personnel is not impeded by a Wind alarm movement telegram
when cleaning the slats.
JRA/S | 2CDC 506 051 D0204 115