在工業(yè)出產(chǎn)進(jìn)程中，具有許多的開(kāi)關(guān)量次序操控，請(qǐng)求依照邏輯條件進(jìn)行次序動(dòng)作，并依照邏輯聯(lián)絡(luò)進(jìn)行連鎖保護(hù)動(dòng)作的操控，及許多離散量的數(shù)據(jù)收集等。傳統(tǒng)上，這些功用是經(jīng)過(guò)氣動(dòng)或電氣操控體系來(lái)完結(jié)的。1968年美國(guó)GM（通用汽車(chē)）公司公開(kāi)招標(biāo)，提出研制能夠代替繼電器的操控設(shè)備的請(qǐng)求，第二年，美國(guó)數(shù)字設(shè)備公司（DEC）研制出了依據(jù)集成電路和電子技能的操控設(shè)備，初次選用程序化的手法運(yùn)用于電氣操控，這即是榜首代可編程序操控器，稱(chēng)Programmable Controller（PC）。
個(gè)人核算機(jī)（簡(jiǎn)稱(chēng)PC）開(kāi)展起來(lái)后，為了便利，也為了反映可編程操控器的功用特色，可編程序操控器定名為Programmable Logic Controlle（PLC），如今，仍常常將PLC簡(jiǎn)稱(chēng)PC
PLC的界說(shuō)有許多種。國(guó)際電工委員會(huì)（IEC）對(duì)PLC的界說(shuō)是：可編程操控器是一種數(shù)字運(yùn)算操作的電子體系，專(zhuān)為在工業(yè)環(huán)境下運(yùn)用而規(guī)劃。它選用可編程序的存貯器，用來(lái)在其內(nèi)部存貯履行邏輯運(yùn)算、次序操控、守時(shí)、計(jì)數(shù)和算術(shù)運(yùn)算等操作的指令，并經(jīng)過(guò)數(shù)字量、模仿量的輸入和輸出，操控各品種型的機(jī)械或出產(chǎn)進(jìn)程�？删幊绦虿倏仄骷捌溆嘘P(guān)設(shè)備，都應(yīng)按易于與工業(yè)操控體系構(gòu)成一個(gè)全體，易于擴(kuò)大其功用的準(zhǔn)則規(guī)劃。

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