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

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Electrical Engineering

CHAPTER 7 Problem 4  Programmable LogicControllers

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

a. What type of timer has been programmed?

b. What is the length of the time-delayperiod?

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

d. When does the timer start timing?

e. When does the timer stop timing and resetitself?

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

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

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

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

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

Figure 7-41 Ladder logic program forProblem.

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