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Programmable Logic Controller (PLC). Brian Caldwell Michael Davis November 28 th , 2007. Definition Dedicated computer for rapid processing of simple logic instructions in a defined time.

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Programmable Logic Controller (PLC)


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programmable logic controller plc

Programmable Logic Controller(PLC)

Brian Caldwell

Michael Davis

November 28th, 2007

slide2
Definition
    • Dedicated computer for rapid processing of simple logic instructions in a defined time.
    • A solid state control system with a user programmable memory that can read input conditions and set output conditions to control a machine or process.
where are they used
Where are they Used?

PLC’s are widely available and used in several, in fact almost all automated processes.

  • Aerospace
  • Automotive Industry
  • Entertainment
  • Petroleum Industry
  • Food, Beverage, and Packaging
    • AND EVERYTHING IN-BETWEEN
required technology
Required Technology

Here is a simplistic view of a PLC system which consists of three main components: an Input/Output Section, the Processor and a Programming Unit.

Machine or Process

Programmable Logic Controller

Output Devices

Input Devices

Programming Unit

costs
Costs
  • The most simple and basic PLC will cost around $50
  • The most advanced and sophisticated PLC run around $10,000

Http://web4.automationdirect.com/adc/overview/Catalog

ladder logic
LADDER LOGIC
  • Ladder logic is really just a symbolic representation of an electrical circuit. Symbols were chosen that actually look similar to schematic symbols of electrical devices.
  • Three broad Categories
    • Contacts (Inputs)
    • Coils (Outputs)
    • Special Function blocks (timers, counters…etc.)
sample problem
Sample Problem

In the figure, will the power on the first wrung normally be on or off?

And for the second wrung?

standards limitations
Standards & limitations
  • Standards
    • Work in severe conditions (dust, moisture, heat, cold, etc)
    • Have the facility for extensive input/output (I/O) arrangements
    • Uninterrupted production
    • Long life of equipment
  • Limitations
    • Limited by the number of input/output ports
    • More sophisticated = harder to program
vendors
Vendors
  • Allen-Bradley
  • Mitsubishi Electric
  • ABB Ltd.
  • Honeywell
  • Siemens
  • Modicon
  • Omron
  • General Electric
  • Square-D
  • Panasonic
video clip
Video Clip
  • http://video.google.com/videosearch?q=plc+application+duration%3Ashort&num=10&so=0&start=0
references
REFERENCES
  • Dr. Red- Professor Brigham Young University
  • http://www.eod.gvsu.edu/~jackh/books/plcs/chapters/plc_intro.pdf
  • http://en.wikipedia.org/wiki/Programmable_logic_controller
  • http://www.tri-plc.com/applications/m-plc2.htm
  • http://www.tri-plc.com/applications.htm
  • http://etidweb.tamu.edu/hsieh/LadderLogic/Symbols_vers5.5.html
  • http://web4.automationdirect.com/adc/Overview/Catalog/PLC_Hardware
summary
Summary
  • PLC are used Everywhere
  • Controls processes with inputs and outputs
  • Cost range for $50 - $10,000
  • Ladder logic is commonly used to program PLC’s
  • Built to perform in severe conditions