Q4. Lamp should glow after a delay of 25 sec when start switch S1 is made ON and should remain ON in glowing condition even the switch is made OFF.Lamp should go OFF immediately when a reset switch S2 is made ON.

fig. Q4.

In first rung of the program,reset NC contact is connected in series with parallel connected start and B3 NO contact and then B3 output coil.
so in first rung when we press the start button the B3 coil gets activated and just because of the B3 NO contact connected in parallel with start button so B3 output coil gets in continuous ON state.
In second rung of program NO B3 contact is connected to TON timer with preset value 25 sec, so when the start button is pressed timer gets ON immediately.
In third rung of program NO contact with done bit address of timer is connected to lamp,so the lamp gets ON after 25 sec if the start button is pressed and reset button is OFF.
In middle of the 25 sec if reset button is pressed timer gets reset and output will not gets ON.

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