43
ABB i-bus
®
KNX
Project design and programming
4.3.3 Parameter window:
Central function
The settings for the simultaneous control of all the channels (central control)
are carried out in the parameter window
Central function
.
Fig. 23:
Central function
parameter window – Channels A....H
The functionality of the individual parameters in the central control function
corresponds to the parameters in the
Channel X
parameter window in nor-
mal mode. The description of the parameters should be taken from section
4.3.2.1.
One exception is the parameter “Brightness value when turned on”. In the
central function, one of 16 scenes can be retrieved in addition to the values
explained in the parameter window
Channel X
.
On receipt of an ON/OFF, dimming or brightness value setting telegram, all
the channels react in the same way and execute the command, regardless of
the previous state of the channel. This option enables the simple implementa-
tion of central control functions e.g. for security or maintenance applications.
This means that during the dimming process, the brightness differences
between the channels will remain even if the maximal or minimal brightness
status is used as the starting point for dimming. A detailed description of the
scenic dimming process can be found in chapter 3.5.
In the central function, the “minimum dimming value” and “maximum dim-
ming value” defined in the parameter window
Channels
or
Channel X
exist as
limit values for the channels. If the minimum dimming value should be smaller
than a physically possible dimming value of a DALI device, this channel is
automatically set to the minimum physically possible dimming value (back-
ground brightness).
Channels which have an active “Burn in lamps” function, continue to be
operated only at 0% (Off) or 100%, regardless of the central dimming value
commands.
These settings and telegrams which are received via the corresponding
communication objects have priority over settings and commands which are
assigned to the specific channels.
The minimum and maximum brightness values parameterised per channel in
the “Channel X” parameter window are retained in the central function and
can differ in the individual channel.
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