Programmable Logic Controllers - With Access
Programmable Logic Controllers - With Access
5th Edition
ISBN: 9781259933523
Author: Petruzella
Publisher: MCG
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Chapter 11, Problem 10RQ
Program Plan Intro

Math instruction:

  • Math instructions refer to all output instructions that uses the data of two words or registers and perform the desired function.
  • Math instructions are program based on the type of processor used.
  • The data manipulation instructions are almost similar to math instructions.
  • The math instruction allows the Programmable Logic Controller (PLC) to take more of conventional computer qualities.
  • Math instructions are normally used to perform arithmetic functions on the values stored in memory words or registers.

Clear instruction:

  • The clear instruction is used to set or reset all the bits of the word in the destination to zero.
  • It is denoted as CLR.

Destination:

  • Destination refers to the address where the results of the instruction are stored.
  • For example, if 1+1=2; then the value 2 is automatically stored in the destination address location.

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