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 5P
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 programmed based on the type of processor used.
  • The data manipulation instructions are almost similar to math instructions.
  • Math instructions are normally used to perform arithmetic functions on the values stored in memory words or registers.

Math functions:

The basic math functions performed by PLCs are as follows:

  • Addition
    • This function is used to add one piece of data to another.
    • It is also called as ADD.
  • Subtraction
    • This function is used to subtract one piece of data from another.
    • It is also called as SUB.
  • Multiplication
    • This function is used to multiply one piece of data by another.
    • It is also called as MUL.
  • Division
    • This function is used to divide one piece of data from another.
    • It is also called as DIV.

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.

Terms used:

The following terms are used in the instruction.

  • Source A
    • Source A refers to the address of the first piece of data that is used in the instruction.
  • Source B:
    • Source B refers to the address of the second 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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