Q :- Lamps A,B and C turns ON when a switch is closed. Lamp B turns OFF after 8 sec's and Lamp C turns OFF after 11 sec's after Lamp B gets OFF

Solution :-

Above figure shows the ladder diagram solution for the problem Q2.0.

At initial condition when the start button I:1/0 is not pressed all the lamps are in OFF conditions.

when the start button is pressed then the TON timer gets activated.

we have given the preset value to the timer as a 19 sec's which is nothing but a total time duration for which the lamp B is ON and Lamp C ON after lamp B.

In second rung of program as soon as the start NO contact is pressed it will activate the lamp A, and when released it will deactivate the lamp A.
In third rung of program start NO contact is connected with the less than equal to comperator and lamp B. In the comperator Timers Accu. address is given to the source A and a constant value is given to Source B, so when the timers value is grater than B comperator value goes low and the Lamp B gets OFF.
When the timer is ON for more than a 19 sec's Done bit of timer goes ON. In fourth rung done bit address is given to the NO contact whic is in series with lamp C. so the lamp C activates after 19 sec's or after 11 sec's after lamp B gets OFF.

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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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