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"DALI Gateway C00Cx2" software
Functional description
Seite 28 von 130
Lamp 1
Group 1
Group 2
Lamp 4
Lamp 5
Lamp 10
Lamp 11
Lamp 8
Lamp 9
Lamp 2
Lamp 3
Group 3
Lamp 6
Lamp 7
Figure 5: Example of a grouping in the DALI system
In the example of a grouping (cf. Figure 5) each one of the drawn-in lamps features a DALI device
which is assigned one or several groups. In the example, lamp 1 is part of an individual group. This
lamp can be controlled separately from the other lamps. The other lamps belong to group 2. Hence,
they are collectively controlled. In addition, the lamps 2, 3, 6 and 7 can be controlled via group 3. Thus,
groups 2 and 3 assigned to these lamps overlap.
• DALI devices that are assigned several groups will always adjust to the state that has been adjusted
last via one of the assigned groups. In this case, the feedback of the switching status or the
brightness value of a group is not always unique.
Example 1(cf. Figure 5): Group 2 is set to 10% brightness. Group 3 is then dimmed to a brightness
value of 20%. The lamps of group 3 will accept the brightness value of 20% which was invoked last.
The feedback of group 2 remains on 10% although some of the devices belonging to the group have
been set to 20% brightness.
Example 2: group 2 is switched on and assumes the brightness value of 100%. Internally, the state
of group 3 remains set at 0% brightness (OFF). The brightness of group 3 is now increased. The
lamps of group 3 will adapt to the dimming (increasing brightness starting at minimum brightness)
even though these lamps have already been switched on via group 2.
Basically, the assignment of DALI devices to groups is arbitrary. For the reasons mentioned above it
is recommended not to assign the devices to several groups at the DALI. Preferably, the devices
should be allocated to separate instead of overlapping groups. A KNX/EIB link via the group
addressing in the ETS is also preferred.
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