Industries need proper application systems to control and monitor instruments and most of you may know well about plc and it is a programmable logic controller. It consists of programmable micro controller and it is programmed using a specialized computer language and the user can program in several languages. Generally the program is written and it is downloaded to plc through cable connection, then the program gets stored in non volatile memory. They are designed for real time use and it can withstand harsh environments and it contains a variety of input and output ports with sensor units. These sensor units can control output actuators like motor starters, displays, lights and valves.
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