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Programming Logic Controllers

Explore the evolution and components of Programmable Logic Controllers (PLCs) in machine, process, motion, and batch control. Delve into Binary, Transistors, Peripheral Chips, and Analog I/O Devices. Learn about Allen-Bradley PLC models and importance of CPU in PLCs.

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Programming Logic Controllers

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  1. Programming Logic Controllers Overview - Chapter 1

  2. PLC Use • Machine control • Process control • Motion control • Batch control • Diagnostic • Other • Usually Multiple applications

  3. History and Development • 1960’s • “Five hours to find it, five minutes to fix it”

  4. History • Richard Morley – Modicon • First PLC • ladder logic programming • Odo Josef Struger • Allen-Bradley

  5. History and Development • http://en.wikipedia.org/wiki/Programmable_logic_controller • http://en.wikibooks.org/wiki/Introductory_PLC_Programming • http://www.isa.org/Content/ContentGroups/News/2006/February24/History_of_the_PLC.htm • http://www.barn.org/FILES/historyofplc.html • http://www.control.lth.se/media/Education/DoctorateProgram/2012/HistoryOfControl/Vanessa_Alfred_report.pdf • http://www.plcs.net/chapters/history2.htm

  6. Block Diagram

  7. Block Diagram

  8. Block Diagram

  9. Central Processing Unit • http://en.wikipedia.org/wiki/Central_processing_unit • A central processing unit (CPU) is the hardware that carries out the instructions of a computer program by performing the basic arithmetical, logical, and input/output operations of the system.

  10. Memory Devices • RAM • ROM • ROM • Programmable ROM (PROM) • Erasable programmable ROM (EPROM or UVEPROM) • Electrically Erasable ROM (EEPROM) • Static RAM • Dynamic RAM

  11. Address Decoder Unit • Address to circuit • Binary number to path

  12. Binary • http://www.jodyculkin.com/category/comics-2/countingbinary

  13. Transisters and Gates • http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/trangate.html • http://www.cs.bu.edu/~best/courses/modules/Transistors2Gates/ • http://www.cs.bu.edu/~best/courses/cs101/F95/lectures/FromGatesToAdder.html • http://www.electronics-tutorials.ws/logic/logic_10.html

  14. Peripheral Chips • Buffers • Data conversion • Networking • Voice • Voice Recognition • more

  15. Discrete Input Modules • Discrete means enumerable, countable, not continuous but distinct • Digital not analog • Real numbers are not discreet • Between 1.0 and 2.0 we have 1.50. • Always a number between x and y • Integers are discrete. No number falls between 1 and 2 • Generally • On or Off • 1 or 0 • True or False • Closed or Open

  16. Discrete Output Modules • Set to on/off • Set to true/false • Set to 1/0

  17. Analog Input/Output Devices • Analog is a continuous signal (wave) • Set to varying voltage levels • Inputs converted to digital via analog to digital converter logic • Digital to analog conversion occurs for outputs

  18. PLC Power Supply • Battery backup • Capacacitor allows battery exchange

  19. Allen-Bradley Programmable Logic Controllers • PICO • MicroLogix • Small Logix • SLC 500 Series • LAN and WAN capabilities • PLC-5 • May have thousands of I/0 ports

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