Automation of many different processes, such as controlling machines or factory assembly lines, is done through the use of small computers called a programmable logic controller (PLC). This is actually a control device that consists of a programmable microprocessor, and is programmed using a specialized computer language. Before, a programmable logic controller would have been programmed in ladder logic, which is similar to a schematic of relay logic. A modern programmable logic controller is usually programmed in any one of several languages, ranging from ladder logic to Basic or C. Typically, the program is written in a development environment on a personal computer (PC), and then is downloaded onto the programmable logic controller directly through a cable connection. The program is stored in the programmable logic controller in non-volatile memory. 
Programmable Logic Controller (PLC) - Collection of Ebooks and Powerpoint representations.
http://rapidshare.com/files/244887280/PLC.rar
http://rapidshare.com/files/244892526/PLC_3.rar
http://rapidshare.com/files/244893582/PLC_Beginner_guide.pdf
http://rapidshare.com/files/244896035/PLC_Manuals.rar
http://rapidshare.com/files/244899361/plc_training_PPT.rar
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