Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Question
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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24. 0.234 = 0.234 234 234.
25. 0.7 = 0.7777...
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CPS 2231 Computer Programming
Homework #3
Due Date: Posted on Canvas
1. Provide answers to the following Check Point Questions from our textbook (5 points):
a. How do you define a class? How do you define a class in Eclipse?
b. How do you declare an object's reference variable (Hint: object's reference variable
is the name of that object)?
c. How do you create an object?
d. What are the differences between constructors and regular methods?
e. Explain why we need classes and objects in Java programming.
2. Write the Account class. The UML diagram of the class is represented below (10 points):
Account
id: int = 0
- balance: double = 0
- annualInterestRate: double = 0.02
- dateCreated: java.util.Date
+ Account()
+
Account(id: int, balance: double)
+ getId(): int
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+ setBalance(newBalance: double): void
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getAnnualInterestRate(): double
+ setAnnualInterest Rate (newRate: double): void
+ toString(): String
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Chapter 13 Solutions
Programmable Logic Controllers
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