11. Write a program in ladder language that will latch on a light 20 s after...
11. Write a program in ladder language that will latch on a
light 20 s after an input switch has been turned on. The timer
will
Continue to cycle up to 20 s and reset itself until the input
switch has been turned off. After the third
time the timer has timed to 20 s, the light will be
unlatched.
Homework Answers
Ladder diagram:
As the input switch,s(assigned to input I:1/1) is turned ON, on timer T4:0 is enabled.
On rung 0001, through the timer timing bit (T4:0/TT) , up counter C5:0 starts counting the cycles of 20s time.
On rung 0002, after 20 s T4:0/DN bit becomes high Timer T4:0 resets when the input switch,S is high.
On rung 0003, after 20 s of input switch is turned on through the closed NO contact of T4:0/DN, Light,L (assigned ton output O:0/1) turns ON and latch on through holding contact O:0/1 and turns OFF when C5:0/DN becomes high (i.e after 3rd time of counting of 20s cycle)
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11. Write a program in ladder language that will latch on a
light 20 s after...
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