EBK LOGIXPRO PLC LAB MANUAL FOR PROGRAM
5th Edition
ISBN: 8220102803503
Author: Petruzella
Publisher: YUZU
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Question
Chapter 8, Problem 7P
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.
Count-Down (CTD) Counter:
- The CTD counter refers to a down counter
- It decrements the accumulated value at each false-to-true transition and it also retains the accumulated value as soon as an on/off power cycle occurs.
Explanation of Solution
b.
Accumulated count of counter CTD:
- It is given that 20 on/off transitions occur at input “A” and 5 on/off transitions occur at input “B”.
- The CTU and CTD counters are addressed at the same location “C5:2”.
- The up-counter and down-counter operates simultaneously to increment and decrement the accumulated count value...
Explanation of Solution
c.
State of output A:
- Here, the accumulated count value of CTU counter is 15.
- The output “A” gets activated only when it receives CU signals from the counter “C5:2”.
- But, the preset value is set for 10...
Explanation of Solution
d.
State of output B:
- Here, the accumulated count value of CTD counter is 15.
- The output “B” gets activated only when it receives CD signals from the counter “C5:2”.
- But, the preset value is set for 10...
Explanation of Solution
e.
State of output C:
- Here, the accumulated count value of up/down counters is 15 and it is greater than the preset value 10 in the counters addressed at “C5:2’...
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Chapter 8 Solutions
EBK LOGIXPRO PLC LAB MANUAL FOR PROGRAM
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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