Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Question
Chapter 8, Problem 11RQ
Program Plan Intro
a.
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.
PLC counter:
- A counter is a PLC instruction which counts up or down when the input transfers from an off state (false) to an on state (true).
- The three different types of counters instructions are as follows:
- Up counter
- Down counter
- Combined counter
Explanation of Solution
b.
Underflow bit of a down-counter:
- An underflow occurs when the count value goes below its preset value...
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Students have asked these similar questions
Implement a 16:1 multiplexer using following instructions:
a. Use a combination of 8:1, 4:1 and 2:1 multiplexer.
b. You are allowed to use only one 8:1 and one 4:1 multiplexer.
c. Identify the correct number of select bits in each multiplexer used.
The carry register:
A. Is set when a carry from bit 7 occurs.B. Is set when a "borrow" for bit 7 of the accumulator occurs.C. Acts like the ninth bit of the accumulator.D. All the above.
2. Use state machine to design a binary up/down counter that counts
from 0 through 12.
Chapter 8 Solutions
Programmable Logic Controllers
Ch. 8 - Name the three forms of PLC counter instructions,...Ch. 8 - State four pieces of information usually...Ch. 8 - In a PLC counter instruction, what rule applies to...Ch. 8 - Prob. 4RQCh. 8 - When does the PLC counter instruction increment or...Ch. 8 - Prob. 6RQCh. 8 - Prob. 7RQCh. 8 - Prob. 8RQCh. 8 - Prob. 9RQCh. 8 - Prob. 10RQ
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