PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
5th Edition
ISBN: 9781264206216
Author: Petruzella
Publisher: MCG
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Chapter 10, Problem 8RQ
Program Plan Intro

Data manipulation instructions:

  • Data manipulation instructions enable the numerical data that exists in the controller’s memory to be performed within the control program.
  • Data manipulation instructions allows manipulation of data that is stored in either single or multiple words groups.
  • It also includes the transfer of data from one data memory area of the Programmable Logic Controller (PLC) to another.
  • In order to accomplish data manipulation, there are mainly two different kinds of instructions.
    • Instructions which operate on word data.
    • Instructions which operate on file or block.
  • It also provides great flexibility to program control circuits.

File:

  • A file refers to a group of words contained in the data table.
  • It must have a definite start and end positions.
  • It is used for storing information.

File Arithmetic and Logic (FAL) instruction:

  • The FAL instruction is used to copy the contents of one file from location to another.
  • It performs file arithmetic and logic operations on the contents of each file.

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