Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Question
Chapter 9, Problem 8RQ
Program Plan Intro
a.
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.
Explanation of Solution
b.
Practical uses for forcing functions:
- The force functions available in PLCs are used to accomplish forcing.
- Force function refers to a manual control function that is capable of overriding the current status of I/O from keyboard...
Explanation of Solution
c.
Need to exercise extreme care:
- Extreme care must be taken while using forcing function because incorrect usage of forcing functions can cause damage to both equipment and people surrounding the equipment...
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