ECT 464

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ECT 464

• Introduction to PLCs

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Your words are windows to your heart.

• For out of the overflow of the heart the mouth
  speaks. Matthew 1234

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ECT 464 Grading

• Homework Quizzes 25
• Labs 25 Midterm Exam                   25
  Final Exam                        25

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Textbook

• Erickson. Programmable Logic Controllers An
  Emphasis on Design and Application, Dogwood
  Valley Press, 2005.
• ISBN 0-9766259-0-3

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What is a PLC?
Industrial PC with I/O (PLC) A device used to
automate monitoring and control of industrial
plant. A set of control relays Computer with
dedicated I/O Widespread in industry Instruction
s in ladder logic, ladder diagram Display
monitor, but no keyboard Noise/Humidity/Temperatu
re/Vibration/EMI resilient
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PLC Architecture
CPU Memory Programming Interface Communication
Interfaces I/O Power Supply
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Major PLC Manufacturers (by US market share)
Allen Bradley (Rockwell) Modicon
(Schneider) General Electric Fanuc Siemens Omron
Mitsubishi
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Minor PLC Manufacturers(alphabetical)
Cutler Hammer Enertron Keyence Koyo Reliance Toshi
ba Yokogawa (83 more PLC Manufacturers)
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Types of PLCs
Fixed vs. Variable Size Pico or
Nano Micro Small Large Specialty I/O
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PLC Languages
Ladder Logic Function Block Diagram Structured
Text Instruction List Sequential Function Chart
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PLC Control Methods
Discrete Analog Sequential (Drum) Recipe
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PLC Uses in Industry
Automotive Building Automation Cement Glass
Chemical Electrical Electronic Electric
Power Fabricated Metals Food Beverage
Machinery Metals Mining Oil Gas
Pharmaceuticals Pulp Paper Refining
Water Wastewater