PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
5th Edition
ISBN: 9781264206216
Author: Petruzella
Publisher: MCG
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Question
Chapter 7, Problem 10P
Program Plan Intro
Timer:
- Timer is mainly used to keep an output ON for a specific length of time.
- It provides a preset delay to the control actions.
- In a timer, the output will be energized when the preset value becomes equal to the accumulated value.
- Three different types of timers include a Delay-OFF, a Delay-ON, and a Delay-ON-Retentive timer.
Timer OFF Delay (TOF):
- TOF refers to an off-delay timer.
- TOF counts the time-based intervals as soon as the instruction becomes false.
- Here, the output changes its state from high to low when the timer provides some time delay (instruction goes from ON to OFF state).
Explanation of Solution
b.
Given:
Consider the given conditions,
- Input = True
- EN = 1
- TT = 1
- DN = 1
Explanation:
- The input is true, so the timer immediately assigns the DN signal bits value as true.
- Since the input is received with true condition, the EN signal bit will become true...
Explanation of Solution
c.
Given:
Consider the given conditions,
- Input = True
- EN = 1
- TT = 0
- DN = 1
Explanation:
- The input is true, so the timer immediately assigns the DN signal bits value as true...
Explanation of Solution
d.
Given:
Consider the given conditions,
- Input = False
- EN = 0
- TT = 1
- DN = 1
Explanation:
- The input is received from true to false condition, so the DN signal bit will be still in the active mode...
Explanation of Solution
e.
Given:
Consider the given conditions,
- Input = False
- EN = 0
- TT = 0
- DN = 0
Explanation:
- The input is received from true to false condition, so the EN bit is assigned with “0”...
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Chapter 7 Solutions
PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
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