Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 7, Problem 3RQ
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 control
programming language.
Timer:
- A timer refers to an instruction which waits for an amount of time before performing something.
- A timer counts fractions of seconds or seconds using the internal CPU clock.
- There are mainly three types of PLC timer delays, such as ON-delay timer, OFF-delay timer, and retentive timer ON.
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Chapter 7 Solutions
Programmable Logic Controllers
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