Programmable Logic Controllers (PLC) are often defined as miniature industrial computers that contain hardware and software used to perform control functions. More specifically, a PLC would be used for the automation of industrial electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or food processing.

Learn about PLCs in details:

http://electrical-engineering-portal.com/download-center/books-and-guides/automation-control/plc-handbook
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