PROGRAMMABLE LOGIC CONTROL.(LL)>CUSTOM<
5th Edition
ISBN: 9781266481475
Author: Petruzella
Publisher: MCG
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Chapter 8, Problem 1P
Program Plan Intro
COUNT-UP (CTU) Counter:
- The CTU counter refers to an up counter.
- This counter is used to count an event that occurs logically or externally and places that value in the counter’s accumulator.
- The accumulated value can even be maintained during false rung conditions and can be reset back to 0 using reset instruction.
Explanation of Solution
b.
Energizing output “O:2/0”:
- The accumulated value of CTU will be incremented by one whenever it receives the conversion input “false-to-true”.
- The DN signal bits will get activated once the accumulate value attains the preset value...
Explanation of Solution
c.
Energizing output “O:2/1”:
- In the given program, “rung 3” does not allow the DN signal bits.
- It means that the output “O:2/1” will be activated for the values which are less than the preset value...
Explanation of Solution
d.
Computing accumulated value:
- Usually the accumulated values of the Programmable Logic Controller (PLC) counters will retain its values even during power off.
- It restores the values until it get the power back...
Explanation of Solution
e.
Accumulated value of the counter:
- The reset mode has been available in the “rung 4” which contains same address “C5:1” of CTU counter.
- The accumulated value of CTU counter will be reset to zero when the “rung 4” turns into “true”...
Explanation of Solution
f.
Situation when the count gets incremented:
- When the “rung 1” input ‘I:1/1” throws “off-to-on” conversion signals, the CTU counter will start its counting process...
Explanation of Solution
g.
Situation when the count gets reset:
- The reset mode will be activated when the “rung 4” becomes true...
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Chapter 8 Solutions
PROGRAMMABLE LOGIC CONTROL.(LL)>CUSTOM<
Ch. 8 - Name the three forms of PLC counter instructions,...Ch. 8 - State four pieces of information usually...Ch. 8 - In a PLC counter instruction, what rule applies to...Ch. 8 - Prob. 4RQCh. 8 - When does the PLC counter instruction increment or...Ch. 8 - Prob. 6RQCh. 8 - Prob. 7RQCh. 8 - Prob. 8RQCh. 8 - Prob. 9RQCh. 8 - Prob. 10RQ
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