When activated, all intruder alarms latch and can only be reset by pressing the reset button.When a presence is detected at night, the external alarm should activate (70 percent duty cycle for 3 seconds) and latch, the internal alarm should start (30 percent duty cycle for 1 second) and latch, and the main lighting should activate after a time delay of 6 seconds and remain on for 20 seconds.The night lighting should only be turned on at night.When the office is not in use, all the lights should be turned off. Unless an intruder triggers the main lighting, it is turned off at night. No daylight switch should be used to control main lighting row 3. The main light system must activate as follows when the office is occupied during the day (using a LIM or Compare function).ĭaylight switch 1 should be used to control the first row of the main lighting.ĭaylight switches 1 and 2 will control main lighting row 2.The thermostat must control the heating during the day.The count should be shown on the BCD display. Counting should not be done in the middle of the night. Only during the day should the current number of occupants be counted by incrementing/decrementing as they enter or leave.All counters/timers must be reset when entering "run" mode for the first time (use the first scan bit).The program functionality should be as follows: I tried to research it, but I still don't know how to convert it from ladder logic to SFC. It is required for us to make it in the sequential function chart logic from ladder logic, but I don't understand how to make it since we never took it. I am doing an assignment where I need to create an office management system that takes care of security, lighting, and heating on its own.
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