Q. 10 sec after output A comes ON, output B comes ON and remain ON even if output A goes off after next 20 sec's. This can be reset only by RESET instruction.

Solution :-

Here I:1/0 is start button and I:1/1 is the reset button

Here a start NO contact is used with address I:1/0 and reset NC contact is connected in series with the NO start contact. when the star button is pressed output coil with address B3:0/0 gets activated which is nothing but a internal really which further set the parallel connected NO contact B3:0/0 ON.
In second rung of program, activated B3:0/0 set the timer T4:0 ON.
We have given the preset value of timer T4:0 as a 30 sec which is nothing but a total time duration for which output A and B ON.
In third run of the program B3:0/0 is connected in series with grater than comperator and timers Done bit NC contact and then connceted to the Output A.You will get the same results if eliminate the first B3:0/0 NO contact in third rung.
In third rung when the timers accumulator value is more than 10 sec and less than 30 sec Output A gets activated.
When the accumulator value is more than 30 sec done bit gets activated and in fourth rung Output B gets activated and remain ON till we press the reset value.

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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