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L-DALI User Manual
343
LOYTEC
Version 5.2
LOYTEC electronics GmbH
Figure 232: Secondary Light Band
8.3.5.5 Occupancy Detection
The constant light controller receives the occupancy information via the proprietary
property
Occupancy_Variable_Value
(property ID 538). How this information is evaluated
depends on the hold time configured in the proprietary property
Hold_Time
(propery ID
540).
If a hold time is configured (
Hold_Time
> 0) occupancy evaluation is event based. That is,
the constant light controller changes to the occupied state when the value OCCUPIED (1) is
received. When the UNOCCUPIED (2) value is received the constant light controller
remains in the occupied state until the hold time configured in
Hold_Time
has expired and
then changes to the unoccupied state. Further, if no OCCUPIED is received for the time
configured in
Hold_Time
the constant light controller changes to the unoccupied state, too.
This behavior typically requires the occupancy sensor to send OCCUPIED with a regular
interval (heartbeat). It allows using multiple occupancy sensors with the same constant light
controller (fan-in). It is the recommended mode if the occupancy information is received via
the local DALI occupancy objects (see Section 8.3.4.3).
If no hold time is configured (
Hold_Time
= 0) occupancy evaluation is state based. That is,
the constant light controller changes to the occupied state when the value OCCUPIED is
received and to unoccupied state when the value UNOCCUPIED is received.
This behavior is typically required if the occupancy information is only propagated if the
state changes (no heartbeat functionality). It does not allow using multiple occupancy (fan-
in) sensors without additional logic (e.g. an Occupancy Controller). It is the recommended
mode, when using occupancy information from other BACnet devices.
After the light has been switched off any updates on the
Occupancy_Variable_Value
input
are ignored for the time specified in
Ignore_Time
(property ID 541).
8.3.5.6 Timing Parameters
To avoid that the constant light controller switches the light on and off repeatedly if the
measured lux value is near the setpoint, a hysteresis can be configured. The proprietary
property
Off_Hysteresis
(property ID 546) defines the hysteresis for switching off the lamp
and the proprietary property
On_Hysteresis
(property ID 545) defines the hysteresis for
switching on the lamp. In addition a delay can be configured before the lamp is switched on
(
On_Delay
) or off (
Off_Delay
). Figure 233 illustrates these configuration parameters.