PROGRAMMABLE LOGIC CONTROL.(LL)>CUSTOM<
PROGRAMMABLE LOGIC CONTROL.(LL)>CUSTOM<
5th Edition
ISBN: 9781266481475
Author: Petruzella
Publisher: MCG
Question
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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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