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Q3. The lamp should glow after a delay of 15 sec when start switch S1 is made ON. the lamp should remain in glowing condition till the start switch S1 is made ON. The lamp should go immediately OFF when start switch S1 is made OFF.


Fig. Q3.


  • In this problem we want to ON the lamp after a 15 sec when start switch S1 is continuously pressed and as soon as the start switch is released lamp should go OFF, so in solution for this we used the NO start contact in series with the TON timer with preset value 15 sec.
  • In next rung we have used the Done Bit NO contact of timer in series with the lamp Output coil, that is the lamp gets ON after 15 sec if we press and hold start button for more than 15 sec.
  • when the start button is released connection to the timer gets cut and timer gets in OFF condition.
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