Q2. When a push button is pressed and released the lamp should glow and gets OFF automatically after 25 sec.If before the expiring of 25 sec if a reset switch is made on the lamp goes OFF immediately.

fig Q2.

Above fig. Q2. shows the solution for the problem Q2.
Here in this problem we want to run the lamp 25 sec when the start button is pressed so we have used the ton timer with preset value of 25 sec and one NO start contact.
In the first rung of the program one NC reset contact is connected in series with the one start button and the output coil B3:0/0.The start button is connected in parallel with the B3:0/0 NO contact.so when the start button is pressed, B3:0/0 goes in the latching mode and when reset is pressed it unlatch the B3:0/0 coil
In second run of the program B3:0/0 is connected to TON timer with preset value of 25 sec.
In third rung of the program output is connected in series with the one NO TT bit and one NC DN bit addressed contact,If you connect only the NO TT bit and it will works same.

Comments

Q1. Lamp should glow when start switch S1 is made ON. lamp should go off after 15 sec automatically. lamp should go OFF immediately when start switch S1 is made OFF. Lamp should go OFF immediately also when reset switch S2 is made ON even before the expiry of 15 sec time.

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