LogixPro PLC Lab Manual for Programmable Logic Controllers
LogixPro PLC Lab Manual for Programmable Logic Controllers
5th Edition
ISBN: 9781259680847
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 11, Problem 9RQ
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.

Negate function:

  • Negate function is used to change the sign of source value from positive to negative or vice versa.
  • It is denoted as NEG.

Terms used:

The following terms are used in the instruction.

  • Source
    • Source refers to the address of the piece of data that is used in the instruction.
  • Destination
    • Destination refers to the address where the results of the instruction are stored.

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