Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Question
Chapter 8, Problem 4RQ
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.
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
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.............Control loop is a continuous cycle of the PLC reading
Ladder Logic O
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input of the PLC.*
O Level switches
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O Flow switches
Pushbutton switches
Selector switches
PLCs use two basic types of instructions:
contacts
coilsDifferentiate the two types of instruction.
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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- Create a PLC ladder logic diagram for an alarm that turns on when either A counts up to 10, or B counts down to 7.arrow_forwardIs logical outputs that can often be powered directly from PLC output boards Motor Starters O Servo Motors O Lights O Switches Oarrow_forwardDraw a plc ladder diagram for blinking lights with start and stop button. Please help me with this. Thank you in advanced.arrow_forward
- 5. The most common type of I/O interface module in PLC is the discrete type, such as A. Thermocouples, strain gages, or pressure sensors B. Selector switches, pushbuttons, and limit switches C. servomotors, stepping motors PID loops, and decoder inputs D. multiplexed displays, and keyboardsarrow_forwardDifferentiate the two types of instruction in PLC.arrow_forwardDiscuss in detail the components of a PLC with suitable sketch.arrow_forward
- Write a PLC ladder logic program that will provide a low voltage start to an electric motor.arrow_forwardA traffic light PLC program working with a screen will be installed. We will enter and adjust the intervals on the screen. (Red, green and yellow light flashing times). Put the every step's picture please.arrow_forwardWhat are some good and bad applications of PLCs?arrow_forward
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