Q :- If push button is pressed, lamp A will turn on instantly and gets off after 8 sec and lamp B turns on, both the lamps get off if push button is released.

Solution :-

here i have used the TON timer, when push button is pressed the timer T4:0 starts, here i have given the preset value of timer as a 8 sec .
and into the next rung of program i have given the TT bit address to one NO contact means that the lamp will be on for the 8 sec and in next rung timers DN bit address is given to the NO contact so after the 8 sec the next lamp B will gets ON.

result :-

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There are total 14 instructions under the bit logic instruction like NO contact, NC contact, SR flip-flop, RS flip-flop,invert power flow etc. lets see the detailed use of them. A) Normally open contact :- Normally open contacts are closed when the bit value stored at the specific address is equal to 1 (one)(here the specific address refers to the address assigned to the NO contact), when we press the Normally open contact assigned to the specific address then it becomes functionally closed and we get supply. here in below fig. when we press the NO contact I0.0 then Output Q0.0 gets ON and when we release the input I0.0 then Output gets OFF. B)Normally Closed Contact :- Normally closed contacts are closed when the bit value stored at the specific add, i.e. the address assigned to the NC contact is equal to 0(zero). when we press the Normally closed contact assigned to the specific address then it becomes functionally open and supply is cuts off. NC contact wor...

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