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PLC’s

PLC’s. By Kyle Petersen 20 November 2009. The first PLC was invented by Dick Morley and his team in 1968. it was invented in response to the U.S car manufactures and the desire to eliminate the large cost involved in replacing the complicated relay

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PLC’s

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  1. PLC’s By Kyle Petersen 20 November 2009

  2. The first PLC was invented by Dick Morley and his team in 1968. it was invented in response to the U.S car manufactures and the desire to eliminate the large cost involved in replacing the complicated relay based machine control systems. • The first PLC was dubbed 084 and one of those is now on display at Modicon's headquarters. It was presented to Modicon by GM, when the unit was retired after nearly twenty years of uninterrupted service. A Little History

  3. A PLC is a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or lighting fixtures. PLCs are used in many industries and machines. Unlike general-purpose computers, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. What is a Programmable Logic Controller? http://en.wikipedia.org/wiki/Programmable_logic_controller

  4. PLC’s are everywhere! • They are arguably the most widely used product in the industrial automation business. • All industry that has any level of automation will have PLC’s • Many consumer Electronics are run by PLC’s, cell phones, garage door openers, toys, toasters, lights, sprinkler systems etc. Where Used

  5. Multiple  M-series PLCs are used in master- slave configuration to control the asphalt distribution actions. Asphalt Distributor Truck  (Courtesy -  Western States Surfacing Jan 2003) Some Examples

  6. Some Examples This gigantic Coal Mining machine has its electrical system completely controlled by a single T44H-npn PLC

  7. Manufacturing Industry- Lead acid battery plant, complete manufacturing system- Extruder factory, silo feeding control system • Travel Industry- Escalator operation, monitored safety control system- Lift operation, monitored safety control system • Aerospace- Water tank quenching system • Printing Industry- Offset web press print register control system- Multi stage screen washing system • Food Industry- Filling machine control system- Main factory feed water pump duty changeover system • Textile Industry- Industrial batch washing machine control system- Closed loop textile shrinkage system • Hospitals- Coal fired boiler fan change-over system • Film Industry- Servo axis controlled camera positioning system • Corrugating- Main corrugator machine control system- BOBST platten press drive and control system • Plastics Industry- Extruder factory, silo feeding control system- Injection molding control system • Agriculture- Glasshouse heating, ventilation & watering system • Foundry- Overhead transportation system from casting process to shotblasting machine • Leisure- Roller coaster ride and effects control system- Greyhound track 'Rabbit' drive system Many more examples http://www.machine-information-systems.com/PLC.html

  8. http://www.youtube.com/watch?v=QBtrFDoqWTM&feature=PlayList&p=E370C1E524A2F671&playnext=1&playnext_from=PL&index=44http://www.youtube.com/watch?v=QBtrFDoqWTM&feature=PlayList&p=E370C1E524A2F671&playnext=1&playnext_from=PL&index=44 • http://www.youtube.com/watch?v=cuWV6QO_Fb8&feature=related Motion control of three gears Can crusher controlled by PLC Some You-Tube videos

  9. PLCs are becoming more and more intelligent. In recent years PLCs have been integrated into industrial networks i.e. all the PLCs in an industrial environment have been plugged into a network which is usually hierarchically organized. The PLCs are then supervised by a control center. There exist many proprietary types of networks. One type which is widely known is SCADA (Supervisory Control and Data Acquisition). Current state andRecent developments http://en.wikibooks.org/wiki/Introductory_PLC_Programming

  10. Most PLC’s require programming, and that requires a computer and software. • Most companies have developed their own software to interact with their PLC’s • Some basic standards in programming do apply. • IEC 61131-3 Supporting Technology

  11. IEC 61131-3 is the international standard for programmable controller programming languages. As such, it specifies the syntax, semantics, and display for the following suite of PLC programming languages: • Ladder diagram (LD) • Sequential Function Charts (SFC) • Function Block Diagram (FBD) • Structured Text (ST) • Instruction List (IL) http://www.rtaautomation.com/iec61131-3/IEC61131FastGuideR1.pdf IEC 61131-3

  12. With a worldwide market of several billions of dollars per year. PLC products are available from hundreds of different sources, and with prices ranging from tens of thousands of dollars (for triple redundant, failure-proof systems) to commodity products at less than a hundred bucks. http://www.isa.org/Content/ContentGroups/News/2006/February24/History_of_the_PLC.htm How much MONEY?

  13. Some Major Vendors

  14. Invented to replace relays and complicated wiring. • Controls devices though a series of input/output signals. • Used throughout industry and run most automation processes. • Can be re-programmed to accomplish a new task when needed. • New PLC’s and systems are networked together and are controlled from main control center. • IEC 61131-3 is the standard for formatting and syntax for programming PLC’s • PLC’s are programmed using one of the 5 primary languages. • PLC’s are very durable and can withstand harsh environments with little human interaction. • Require software interface, and some training on how to program. • Very adaptable to almost any system or process. Modular. Summary

  15. http://www.machine-information-systems.com/PLC.html • http://www.isa.org/Content/ContentGroups/News/2006/February24/History_of_the_PLC.htm • http://tri-plc.com/applications/m-plc2.htm • http://seg-me.com/new_page_11.htm • http://www.rtaautomation.com/iec61131-3/IEC61131FastGuideR1.pdf • http://en.wikibooks.org/wiki/Introductory_PLC_Programming • http://en.wikipedia.org/wiki/Programmable_logic_controller • http://www.youtube.com/watch?v=QBtrFDoqWTM&feature=PlayList&p=E370C1E524A2F671&playnext=1&playnext_from=PL&index=44 • http://www.youtube.com/watch?v=cuWV6QO_Fb8&feature=related References

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