Programmable Logic Controller (PLC)
A programmable logic controller(PLC) is an industrial digital computer built to withstand harsh environmental operations of manufacturing.
Programmable logic computers (PLC) had their origin in the automotive industry in the late 1960's out of the need for a replacement of hard wired relay logic systems.
Programmable logic computers are still relied upon heavily by the automotive industry but also have found a home in harsh manufacturing environments. PLC's have evolved as computerization, programming, desk top tools, communication, interfaces and the Internet have integrated themselves into industry