Brightness sensor

A brightness sensor measures the current brightness value of the surroundings. Depending on the set threshold values, switching operations are triggered or scenes are called up. The interval or brightness change at which the brightness value is to be sent to the bus can be set.

The following functions are available on the parameter page of the sensor channel:

• Switching
• Brightness value transmitter
• Scene extension unit

The ETS provides the corresponding parameters and communication objects dynamically for the function according to the parameterised function.

If "no function" is selected, no switching, dimming or scene commands are sent, only the brightness value is transmitted.

An optional disable function can be activated for the brightness sensor.
There is either no reaction at the start of a block or it is switched ON or OFF.
At the end of disabling, the last brightness value received from the DALI sensor is analysed according to the configured thresholds. The threshold command is only tracked if the behaviour has not already been executed before disabling.

Limiting value definition

A brightness limiting value to be monitored always consists of an upper and lower brightness threshold. The brightness thresholds are assigned via a limiting value and hysteresis derived relatively from the limiting value. The type of limiting value (upper or lower threshold) must be preset accordingly by the parameter "Limiting value corresponds to".
Depending on the configuration, a limiting value output can transmit a telegram if the brightness value exceeds the upper threshold and/or falls below the lower threshold.

The limit value is configured in the ETS and cannot be changed during operation of the device.
The hysteresis is a static value that is parameterised in the ETS and is always related to the parameterised upper or lower threshold. The hysteresis cannot be adapted during operation of the device. The device recalculates the hysteresis automatically if a new limiting value is preset.

Example of the limiting value definition:
1. Brightness limiting value = Upper threshold (Example 1 of the limiting value definitionLimiting value is upper threshold)
-> Lower threshold = brightness limiting value - hysteresis

2. Brightness limiting value = Lower threshold (Example 2 of the limiting value definitionLimiting value is lower threshold)
-> Upper threshold = brightness limiting value + hysteresis