Activities Manual for Programmable Logic Controllers
5th Edition
ISBN: 9781259679568
Author: Petruzella, Frank
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 13, Problem 1RQ
Program Plan Intro
Programmable Logic Controller (PLC):
- Programmable Logic Controller (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.
Expert Solution & Answer
Explanation of Solution
Installing PLCs within an enclosure:
- The PLCs are installed within the enclosure for protection against atmospheric conditions such as temperature, humidity, dust, shock, and corrosion.
- It also helps to reduce the effects of electromagnetic radiation.
- A properly installed PLC with its rugged features will result in a trouble free service for years.
- There are 12 different types of enclosure for PLCs which are designed to be dust-tight.
- Metal enclosures are used for PLC protection because it provides a shielding which minimizes the effects of electromagnetic radiation.
Therefore, PLCs are installed in a separate enclosure to protect it from atmospheric conditions and to minimize the effects of electromagnetic radiation.
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Chapter 13 Solutions
Activities Manual for Programmable Logic Controllers
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