EBK LOGIXPRO PLC LAB MANUAL FOR PROGRAM
5th Edition
ISBN: 8220102803503
Author: Petruzella
Publisher: YUZU
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Textbook Question
Chapter 7, Problem 5P
Study the ladder logic
- a. What type of timer has been programmed?
- b. What is the length of the time-delay period?
- c. When does the timer start timing?
- d. When is the timer reset?
- e. When will rung 3 be true?
- f. When will rung 5 be true?
- g. When will output PL4 be energized?
- h. Assume that your accumulated time value is up to 020 and power to your system is lost. What will your accumulated time value be when power is restored?
- i. What happens if inputs PB1 and PB2 are both true at the same time?
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Students have asked these similar questions
3. Study the ladder logic program in Figure 7-40 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?
L1
Input
LS1
Ladder logic program
Outputs
L2
LS1
-TON
TIMER ON DELAY
Timer
T4:0
-(EN)-
Time base
1
Preset
10(DN)
SOL A-fo
Accumulated
°
SOL B-of
T4:0
SOL A
2
3
4
10
DN
T4:0
SOL B
DN
T4:0
R
EN
T4:0
EN
Figure 7-40 Ladder logic program for Problem 3.
R
Q2): Design a sequential circuit with two T flip-flops A and B, and one input x_in.
(a) When x_in = 0, the state of the circuit remains the same. Whenx_in = 1, the circuit goes through the
state transitions from 00 to 01, to 11, to 10, back to 00, and repeats.
(b) When x_in= 0, the state of the circuit remains the same. When x_in=1, the circuit goes through the
state transitions from 00 to 11, to 01, to 10, back to 00, and repeats.
2. Design a logic circuit that controls an elevator door in a three-story building. The circuit has four inputs.
M is a logic signal that indicates when an elevator is moving (M=1) or stopped (M=0). F1, F2 and F3
are floor indicator signals that are normally LOW, and they go HIGH only when the elevator is
positioned at the level of that particular floor. For example, when the elevator is lined up level with
the second floor, F2=1 and F1=F3=0. The circuit output is the OPEN signal which is normally LOW
and is to go HIGH when the elevator door is to be opened.
Chapter 7 Solutions
EBK LOGIXPRO PLC LAB MANUAL FOR PROGRAM
Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - Prob. 3RQCh. 7 - Prob. 4RQCh. 7 - a. What are the two methods commonly used to...Ch. 7 - Prob. 6RQCh. 7 - Prob. 7RQCh. 7 - Prob. 8RQCh. 7 - For a TOF timer: a. When is the enable bit of a...Ch. 7 - Explain what each of the following quantities...
Ch. 7 - State the method used to reset the accumulated...Ch. 7 - Study the ladder logic program in Figure 7-40 and...Ch. 7 - Study the ladder logic program in Figure 7-42, and...Ch. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10PCh. 7 - Prob. 11PCh. 7 - Prob. 13PCh. 7 - When the lights are turned off in a building, an...
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