PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
5th Edition
ISBN: 9781264206216
Author: Petruzella
Publisher: MCG
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Chapter 11, Problem 8P
Program Plan Intro

a.

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.

Addition math function:

  • Math instructions refer to all output instructions that uses the data of two words or registers and perform the desired function.
  • Addition function is used to add one piece of data to another.
  • It is also called as ADD.

Program Plan Intro

b.

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.

Addition math function:

  • Math instructions refer to all output instructions that uses the data of two words or registers and perform the desired function.
  • Addition function is used to add one piece of data to another.
  • It is also called as ADD.

Timer ON Delay (TON):

  • TON refers to an on-delay timer.
  • The on-delay timer is the most commonly used timer.
  • TON counts the time-based intervals as soon as the instruction becomes true.
  • Here, the output changes its state from low to high when the timer provides some time delay (instruction goes from OFF to ON state).

MOV instruction:

  • Move (MOV) instruction is used to copy the data of the source register into destination register.
  • Here, the contents of the source register will not be altered.
  • In other words, it is used to copy the value in one word or register to another word or register.

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