Self-Study Course: Basics of PLCs http://www.sea.siemens.com/training/step2000/courses/plcbasics/intro.aspSelf-Study Course: AC Motors http://www.sea.siemens.com/training/step2000/courses/acmotors/intro.aspSelf- Study Course: Control Circuits found in Industry. http://www.sea.siemens.com/training/step2000/courses/controlcomponents/circuits/intro.aspPLC ON-LINE TUTORIALhttp://www.plcs.net/contents.shtml PROTEL.COM (Home Page)http://www.protel.com/Semiconductor Data sheets on the Web http://www.bgs.nu/sdw/p.htmlElectronics circuit designed by Tomi Engdahl.http://www.hut.fi/Misc/Electronics/circuits/index.htmlElectrical motor control http://www.us-epanorama.net/motorcontrol.htmlLinear and Rotary Sensors by Macrosensorshttp://www.macrosensors.com/ Manufacturing Systems Engineering 1996/97 ROBOTICS http://www.eng.abdn.ac.uk/~eng114/mse3rob1.htm