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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