ABB i-bus KNX Product Manual page 52

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ABB i-bus KNX
Commissioning
Brightness value when turned ON
Options:
This parameter defines the brightness value, which is used to switch on all the lighting groups when an ON
telegram is received. If a value is set, which is outside the dimming value range (Maximum brightness
value or Minimal brightness value), the threshold is set as the minimum or maximum brightness value.
The dimming thresholds of the individual lighting groups apply with the control of all groups. In this way,
the brightness values of the individual lighting groups under common control can be differentiated.
If individual lighting groups, e.g. are set to a brightness not equal to the switch on value due to dimming,
and then receive an ON telegram (central telegram), the parameterized switch on value of the output is
set.

previous value: All lighting groups are switched on with the brightness value which they had when
switched off centrally via the communication object Switch (DALI output).
Note
Saving of the last brightness value is implemented with each central OFF telegram that is received via
the communication object Switch or Switch/status. At this point, the brightness values of the individual
lighting groups are saved and switched back on with the next central ON telegram that is received with
the communication object Switch or Switch/status. If a lighting group is already switched off at the time
of the central OFF telegram, the state (brightness value equal to 0) is saved as the last state for the
lighting group. Thus the actual room state at the time of switch off is recreated.
One exception is if all lighting groups on the output are already switched off. In this case, with a further
central OFF telegram, the OFF state is not saved as the last brightness value for all lighting groups.
One exception is if all lighting groups on the output are already switched off. In this case, with a further
central OFF telegram, the OFF state is not saved as the last brightness value for all lighting groups.
If a renewed OFF telegram is received during dimming down, the current brightness value is saved as
the last brightness value for the lighting group.
On Gateway operating voltage failure the last brightness value is lost, and after recovery of the Gateway
operating voltage, the maximum brightness is set. The last brightness value is retained after a download
or KNX bus voltage failure.
A differentiation is made between the last brightness value with central switching via communication
object Switch (DALI output) and with group-orientated switching via communication objects Switch
(Group x). Both values are independent of each other. This means if some lighting groups are dimmed
or switched on or off via the group telegrams, the last brightness values for the central telegram is
retained without change. When a central ON telegram is received, the brightness values that were set
during the last central OFF telegram are set again.
50 2CDC507128D0202 | DLR/A 4.8.1.1
previous value
100 % (255)
...
1 % (3)