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Re: PLC

A PLC(Programmable Logic Controller )is a logic box in an electronic device used for automation of the industrial processes, such as control of machinery on factory assembly lines.Unlike general purpose computers , the PLC is designed for multiple inputs and output arragements , extended temperature ranges , immunity to electrical noise , and resistance to vibration and impact. Programs to control machine operation are typically stored in battery backed or non volatile memory .A PLC is an example of a real time system since output results must be produced in response to input conditions within a bounded time , otherwise unintended operation will result.
 

PLC

You can consider a PLC as a group of three box.One is input box, another one is control section box and the last one is output box.You can give input signal to control box form input terminal. The control section will produced output signal to the output terminal to contorl the machine operation. You can program the requried sequence of operation to the control section.
 

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