This logic group takes over various functions for a staircase lighting.

The input parameters are a door contact, a calendar input to automatically deactivate light on in a certain time window and two inputs of the bell buttons for the two floors.
Other inputs are a power surge switch, a twilight switch from the weather station and the current switching status of the stairwell light.

The following functions are performed by this logic group.
The light switches on automatically when the front door is opened and twilight is active (only within a certain time window). So a so-called "homecoming" function to automatically switch on the light when you open the front door.

Another function is to switch on the light with a random time when the doorbell is rung in the dark. This serves as a little protection against burglary. This function is intended for so-called "twilight burglars" who ring the bell to see if there is really no one at home.

Last but not least, the light on/off function when simply clicked. This means that when the light is off, the light is switched on, and vice versa. In this case, the light is switched on via a staircase automat and the light is switched off again after a certain time.
If the light is switched on with a double click, the light flashes briefly to confirm and you have a permanent light.

Markus Waldhauser
(218; 2022.04)