ABB i-bus KNX Product Manual page 91


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:
Status of forced operation
after KNX 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 light control was activated before forced operation,
it will be active.

Switch on by force: The lighting group is forcibly operated and switched on at the brightness
parameterized in Brightness while object value = 1 (forced operation, active, ON).
How does forced operation function?
The active forced operation, irrespective of whether it is 1 bit or 2 bit control, has an
influence on the overall reaction of the lighting group. When Forced operation is recalled, the
parameterized brightness value in the ETS is set. A dimming telegram currently running or
light control is interrupted.
Brightness values received during Forced operation are not set, although they are
processed in the background and saved. Switch telegrams and light controls are also saved
in the background. Relative dimming telegrams and dimming ramps are ignored. This also
applies for prewarning times at the end of the Staircase lighting function. The target
brightness value is saved directly.
With the end of Forced operation, the brightness value saved 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 light control
will be reassumed after Forced operation at the switch-on brightness. If the Staircase
lighting function was activated before Forced operation, the Staircase lighting function will
continue after Block is rescinded.
The state of Forced operation is displayed in the communication object Diagnostics, see
Communication object no. 6,
Forced operation has a higher priority than the Block of a lighting group.
Diagnostics, page 126.
DLR/S 8.16.1M | 2CDC 507 100 D0202 89