ABB i-bus KNX Product Manual page 87


ABB i-bus KNX
Commissioning

2-bit control: A 2 bit Forced operation communication object is enabled. If the lighting group receives a
telegram with the value 2 or 3 via this communication object, the lighting group is forcibly operated.
The reaction to another telegram value is described in the following table:
Setting force operation after bus
voltage recovery
Options: inactive
switch on by force
Using this parameter, the state of forced operation after bus voltage recovery is parameterized.

inactive: The lighting group is enabled after bus voltage recovery and is no longer subject to
forced operation. If parameterized constant lighting control was activated before forced
operation, it will be active.

switch on by force: The lighting group is forced operated and switched with the brightness,
which has been parameterized in the brightness parameter, if the object value = 1 (switch on
by force).
How does forced operation function?
The active forced operation, irrespective of whether it is a 1 bit or 2 bit recall, has an
influence on the overall behavior of the lighting group. When the forced operation is recalled,
the parameterized brightness value in the ETS is set. A dimming telegram currently running
or a lighting control is interrupted.
Brightness values received during forced operation are not set; however, they are processed
in the background and saved. Switch telegrams and lighting controls operating in the
background are also saved. Relative dimming telegrams and dimming ramps are ignored.
This also applies for prewarning times at the end of the function Staircase lighting. The
target brightness value is saved directly.
With the end of forced operation, the brightness value stored in the background is set. The
lighting group returns to the state it was in before forced operation. If an additional function
was active, e.g. Light control, Staircase lighting or Slave, it will also be active after forced
operation. If the DALI Light Controller had control before forced operation, the lighting
control will be reassumed after forced operation with the switch on brightness. If the function
Staircase lighting was activated before forced operation, the function Staircase lighting will
continue after the block is removed.
The state of forced operation is displayed in the communication object Diagnostics, see
communication object
Forced operation has a higher priority than blocking a lighting group.
Communication object No. 6, Diagnostics, page 122.
DLR/A 4.8.1.1 | 2CDC507128D0202 85