ABB i-bus KNX Product Manual page 56

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ABB i-bus KNX
Commissioning
Switch-on value
Options:
This parameter defines the brightness value at which all the lighting groups are switched on when an ON
telegram is received. If a value is set which is outside the dimming value range (Maximum dimming value
or Minimal dimming value), the threshold is set as the minimum or maximum dimming value.
The dimming thresholds of the individual lighting groups apply for 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 the lighting groups are switched on at the brightness value which they had when
switched off centrally via the communication object Switch (DALI output).
Note
Saving of the last brightness value takes place 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, this 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 the 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 the 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.
If there is a light controller operating voltage failure, the last brightness value is lost, and after recovery
of the light controller 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-oriented switching via communication objects Switch (Group
x). Both values are independent of each other. This means that, if some lighting groups are dimmed or
switched on or off via the group telegrams, the last brightness value for the central telegram is retained
unchanged. When a central ON telegram is received, the brightness values that were set during the last
central OFF telegram are set again.
54 2CDC 507 100 D0202 | DLR/S 8.16.1M
Previous value
100 % (255)
...
1 % (3)