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/His tory_of_the_PLC.htm http://www.isa.org/Content/ContentGroups/News/2006/February24/His tory_of_the_PLC.htm http://www.barn.org/FILES/historyofplc.html http://www.control.lth.se/media/Education/DoctorateProgram/2012/Hi storyOfControl/Vanessa_Alfred_report.pdf http://www.control.lth.se/media/Education/DoctorateProgram/2012/Hi storyOfControl/Vanessa_Alfred_report.pdf http://www.plcs.net/chapters/history2.htm

6. 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 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 Decimal patternBinary numbers 00 11 210 311 4100 5101 6110 7111 81000 91001

18. 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

19. Peripheral Chips Buffers Data conversion Networking Voice Voice Recognition more

20. 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

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

22. 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

23. PLC Power Supply Battery backup Capacacitor allows battery exchange

24. 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