CHAPTER 7 Problem 4 Programmable Logic Controllers Study the ladder logic program in Figure 7-41 and answer...

CHAPTER 7 Problem 4 Programmable Logic Controllers

Study the ladder logic program in Figure 7-41 and answer the questions that follow:

a. What type of timer has been programmed?

b. What is the length of the time-delay period?

c. What is the value of the accumulated time when power is first applied?

d. When does the timer start timing?

e. When does the timer stop timing and reset itself?

f. When input LS1 is first closed, which rungs are true and which are false?

g. When input LS1 is first closed, state the status (on or off) of each output.

h. When the timer’s accumulated value equals the preset value, which rungs are true and which are false?

i. When the timer’s accumulated value equals the preset value, state the status (on or off) of each output.

j. Suppose that rung 1 is true for 5 s and then power is lost. What will the accumulated value of the counter be when power is restored?

Figure 7-41 Ladder logic program for Problem.

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Manojponduru answered 1 year ago

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