26
ABB i-bus
®
KNX
4.2.2 Central communication
objects (Channels A...H)
The following communication objects enable the central control of all DALI
outputs (channels) A...H i.e. all outputs are controlled together.
Fig. 11: Communication objects “Channels A...H”
No.
Function
Object name
Data type
Flags
80
On / Off
Channels A … H
1 bit (EIS 1)
DPT 1.001
C, W
Channels A ... H On / Off [EIS 1; 1-bit switching]:
All the channels are switched on or off
simultaneously (central control) via this object according to the preset brightness values
(
Central function
parameter window). Telegrams which are received via this communication
object (CO) have priority over commands which are received by the specific channel objects.
If the central control is switched off via the CO “Central Control On / Off” (Off), this setting has
temporary priority i.e. the central control can be ended by an individual object at any time.
If the central control is switched on (On) via the CO “Central Control On / Off”, the priority of
the central control is retained until the central control is set to “Off” again. This means that the
communication for the individual control of the channels is inactive and any received tele-
grams do not have a function.
Telegram value
“1”: On
“0”:
Off
The minimum and maximum dimming values set per channel in the “Channel X” parameter
window retain their validity. Starting values which lie above or below the maximum or
minimum values selected for the channel are not set. The parameterised maximum or
minimum value is set instead. Different maximum or minimum brightness values can thus be
set in the different channels when dimming centrally.
81
Relative Dimming
Channels A … H
4 bit (EIS 2)
DPT 3.007
C, W
Channels A ... H Relative Dimming [EIS 2; 4-bit dimming]:
The relative dimming telegram
for all the channels is received via this object (central control). Telegrams which are received
via this communication object (CO) have priority over commands which are received by the
specific channel objects. If the central control is switched off via the CO “Central Control
On / Off” (Off), this setting has temporary priority i.e. the central control can be ended by an
individual object at any time. If the central control is switched on (On) via the CO “Central
Control On / Off”, the priority of the central control is retained until the central control is set
to “Off” again. This means that the communication for the individual control of the channels
is inactive and any received telegrams do not have a function.
The information about the relative brightness differences of the individual channels is retained
during a dimming process, even if the maximum or minimum brightness is reached and all the
lamps have achieved the maximum or minimum dimming value. When dimming up or down,
the selected brightness differences are reset.
Table 5: Communication objects “Channels A...H”
Project design and programming