Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 10, Problem 1RQ
In general, what do data manipulation instructions allow the PLC to do?
Expert Solution & Answer
Program Plan Intro
Programmable Logic Controller (PLC):
- PLC is a specialized computer used in industrial segments to control machines and process.
- PLC is program that consists of a set of instructions which resembles the controlling functions needed to perform specific tasks.
- The function of PLC is similar to that of a relay and hence, in an industrial segment a relay is greatly replaced by a suitable PLC.
- When compared to general Personal Computer (PC), a PLC is available in small and tiny sizes.
- The basic architecture of a PLC consists of an input-output interface module and a small Central Processing Unit (CPU) that runs by controlling programming language.
Data manipulation instructions:
- Data manipulation instructions enable the numerical data that exists in the controller’s memory to be performed within the control program.
- 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.
- There are mainly two broad categories of data manipulation as follows:
- Data transfer
- Data comparison
Explanation of Solution
Functions of 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 PLC to another.
- It allows storing data and operating on data with math functions, data conversions, comparisons and logical operations.
- It also provides great flexibility to program control circuits.
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Chapter 10 Solutions
Programmable Logic Controllers
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