How a PLC works in the Industrial Electrical Training video Course by http://www.bin95.com is plc automation explaining plc basics. This is just a small, low resolution sample from DVD 10b of the 10 DVD Industrial Electrical Training Video Library. The actual DVDs have much better quality and more details. http://www.youtube.com/watch?v=dwJ5rmNOCZI
For instructor based PLC Training, see https://www.youtube.com/watch?v=Bw-m9gT7Nh4