Parameters for Human Centric Lighting (HCL)

Each matrix can be given a designation, which is visible only in the ETS for better identification.

Each HCL matrix contains the settings for the colour temperature (1,000...10,000 K) and brightness (0...100%) for each full hour of the day (0:00 midnight, 1:00 a.m., 2:00 a.m....11:00 p.m.). Depending on the time of day, the individual colour temperature and brightness values are called up one after the other as the day colour temperature sequence progresses. The values between two full hours are determined continuously every minute by linear interpolation in the process to implement a smooth colour temperature and brightness curve.

In an HCL matrix, the colour temperature and brightness values are always configured for each time. Whether a group or single device reacts only to the pre-programmed colour temperature or additionally to the defined brightness value is defined by the parameter "Type of daytime colour temperature sequence" on the parameter pages of the groups and single devices.

The colour temperature values stored in an HCL matrix can always be configured within the range of 1,000...10,000 K and the brightness values within the range of 0...100%. If HCL values are outside the range defined by the minimum and maximum colour temperature or minimum and maximum brightness of assigned groups or single devices, the gateway limits the colour temperature and brightness to the defined limits when a daytime colour temperature sequence is running.

The "brightness" and "colour temperature" parameters are available for each full hour of an HCL matrix. The default setting of the parameters depends on the time.

This parameter defines which of the up to four HCL matrices is initially effective for the affected group or single device after the gateway has been commissioned by the ETS or after a reset. Optionally, the matrix assignments can be switched by 1-byte objects during operation of the gateway.

After an ETS programming operation or mains voltage return, the configured HCL matrix is effective. However, it is executed only when a start takes place.

During operation of the gateway, the matrix assignments of groups and single devices can be switched over by 1-byte objects. This allows individual switching of the pre-programmed daytime colour temperature sequences depending on the application.

Checkbox activated: The 1-byte communication object "Daytime colour temperature sequence (HCL) - Switch matrix" is available. According to KNX DPT 17.001, a switchover can be performed by the number of the matrix (1...4) during operation of the gateway.

Checkbox deactivated: No communication object is available for switching the HCL matrices during operation. The HCL matrix defined by the parameter "After ETS programming operation" always remains effective.

The two status objects for the daily colour temperature curve (HCL) "Status" and "Active matrix" can be activated or deactivated with this parameter

Checkbox activated: The 1-byte communication object "Daytime colour temperature sequence (HCL) - active matrix" is available. In accordance with KNX DPT 17.001, the number of the matrix (1 ... 4) the currently active matrix is transferred.
The 1-bit communication object "Day colour temperature curve (HCL) - Status" shows the status of the day colour temperature curve ("1" = day colour temperature curve active, "0" = day colour temperature curve not active).

Checkbox deactivated: No communication object for the status of the daily colour temperature curve (HCL) is displayed.

A daytime colour temperature sequence can be implemented with or alternatively without brightness adjustment. Whether a group or single device reacts only to the pre-programmed colour temperature or additionally to the set brightness value of the HCL matrix is defined by this parameter.

Only colour temperature adjustment: In this case, the gateway only takes into account the colour temperature value of the HCL matrix corresponding to the day of the week and the time of day. The brightness value stored in the matrix is ignored. The brightness can then be controlled by other functions of the gateway (e.g. by switching and dimming).

Colour temperature and brightness adjustment: In addition to evaluating the configured colours of the HCL matrices, the gateway also evaluates the stored brightness values.

A daytime colour temperature sequence is of the same priority as the normal control of the brightness and colour temperature of a group or single device by the corresponding communication objects. A scene recall also is of the same priority. The functions mentioned above override a daytime colour temperature sequence in progress with regard to the colour temperature and brightness.

In the event of overriding, a running daytime colour temperature sequence can be automatically stopped or alternatively continue to run in the background. The behaviour is defined by this parameter.

HCL continues to operate: A running daytime colour temperature sequence can be overridden at any time by other functions of the gateway. However, the daytime colour temperature sequence continues to run, whereby the values stored in the HCL matrix continue to be called up continuously every minute, depending on the time. In this case, the commands received last or given for the colour temperature or brightness of other functions (e.g. scene recall) are replaced by the HCL values again at the latest after one minute. With daytime colour temperature sequences with brightness adjustment, the brightness values defined in the HCL matrix are tracked. The gateway then continues to process the interpolated brightness values every minute and, if necessary, switches on any operating devices that have been switched off. In the event of daytime colour temperature sequences without brightness adjustment, the colour temperature is internally tracked by the HCL matrix even if groups or single devices are switched off internally. If a group or single device is switched on, the gateway sets the tracked colour temperature so that DALI operating devices subsequently switched on indicate the correct values of the daytime colour temperature sequence.

HCL is terminated: If a daytime colour temperature sequence is automatically stopped by override, the gateway immediately stops processing the assigned HCL matrix.

Human Centric Lighting (HCL) implements colour temperature sequences for implementing different lighting scenes depending on the time of day and day of the week. Depending on the time, the individual colour temperature and brightness values are called up in sequence. However, this is done only on selected weekdays. In the ETS configuration, it can be defined at this point on which days of a week a daily colour temperature sequence is executed.

A started daytime colour temperature sequence is executed only on the configured weekdays. On days of a week not included in the selection, the daytime colour temperature sequence is paused.