LogixPro PLC Lab Manual for Programmable Logic Controllers
5th Edition
ISBN: 9781259680847
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Question
Chapter 7, Problem 6P
Program Plan Intro
Retentive Timer ON (RTO):
- RTO refers to an on-delay timer.
- RTO counts the time-based intervals as soon as the instruction becomes true.
- It retains the accumulated value as soon as instruction goes false or when power cycle occurs.
Explanation of Solution
b.
Required time:
- In “rung 2”and “rung 3”, the two RTO timers are interconnected.
- Here, the “present” value of “rung 2” is “2900” and the “present” value of “rung 3” is “1780”.
- Add these two present values to get the time required to produce the output.
- The sum of the two values is “4680”...
Explanation of Solution
c.
Conditions to be satisfied:
- The power required to be supplied to “L1” and close the input “PB1” contacts to turn the “rung 4” to “true”.
- Once, “PB1” becomes true, the “rung 2” star...
Explanation of Solution
d.
Status of the output:
- The RTO instruction used in the given diagram stores the timed count of timer and counts the time even if the power is lost or restored.
- The “rung 3” is required to activate the “DN” sign...
Explanation of Solution
e.
Result when PB2 is ON:
- If the input PB2 is “ON”, then the reset instructions of the timers “T4:1” and “T4:2” will make the “rung 1” as “true”...
Explanation of Solution
f.
Required accumulated time:
- The “rung 2” becomes “true” and the RTO instructions are started to execute when PB1 input contact is closed.
- The timer “T4:1” starts timing as long as the accumulated value attains the present value “2900”...
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Draw a ladder logic diagram for the timer scenario shown.
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Scenario 1
Turn on a light when either one of two switches (I1, I2) is toggled on (construct an OR Gate). Turn on a second light when both switches (Same inputs I1, I2) are toggled on (construct an AND Gate). Turn on a third light when both switches (Same inputs I1, I2) are toggled off (construct a NOR Gate). Turn on a fourth light when either switch (Same inputs I1, I2) is toggled off (construct a NAND Gate). Print a copy of the program showing the construction of the four gate configurations. Also, submit a truth table for the four input configurations.
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Scenario 2
Construct a seal-in circuit using a stop-and-start pushbutton and an internal coil to seal in. Turn on a light for 10 seconds when the start button is pushed then turn it off automatically or…
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Clk
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Chapter 7 Solutions
LogixPro PLC Lab Manual for Programmable Logic Controllers
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