A high school wants to control the daily bell and alarm system using the same device. The bell rings from Monday to Friday for one minute except during the holidays. The “alarm” mode is active during the holidays, on weekends, and at night Monday through Friday.
The alert is given for 1 minute by an audio signal alternating 2 s ON, 1 s OFF, and by an indicator light activated by a motion detector.
It must be possible to reset the alarm.
Advantages of the application:
The annual clock, available on FBD, allows school holidays and legal holidays to be taken into account.
Description of the inputs/ouputs:
Model Required:
Model with annual clock:
SR2 B121 BD (24 V DC) or SR2 B121 JD (12 V DC) for example.
Program Description:
To program the three clocks, copy or adapt the parameters of figures 1, 2 and 3.
The logic block unites the activation conditions of the “alarm” mode according to the equation :
Figure 1:
Figure 2:
Figure 3:
Logic diagram:
Click on the link below to access the application:
School bell
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