Learn A Programmable Logic Controller (PLC) in Hindi By Rajvir Singh.
They Were First Developed In The Automobile Industry To Provide Flexible, Ruggedized And Easily Programmable Controllers To Replace Hard-Wired Relays, Timers And Sequencers. Since Then They Have Been Widely Adopted As High-Reliability Automation Controllers Suitable For Harsh Environments. A PLC Is An Example Of A "Hard" Real-Time System Since Output Results Must Be Produced In Response To Input Conditions Within A Limited Time, Otherwise Unintended Operation Will Result.
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