在工業(yè)出產(chǎn)進(jìn)程中，具有許多的開關(guān)量次序操控，請求依照邏輯條件進(jìn)行次序動作，并依照邏輯聯(lián)絡(luò)進(jìn)行連鎖保護(hù)動作的操控，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)過氣動或電氣操控體系來完結(jié)的。1968年美國GM（通用汽車）公司公開招標(biāo)，提出研制能夠代替繼電器的操控設(shè)備的請求，第二年，美國數(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用于電氣操控，這即是榜首代可編程序操控器，稱Programmable Controller（PC）。
個人核算機（簡稱PC）開展起來后，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簡稱PC
PLC的界說有許多種。國際電工委員會（IEC）對PLC的界說是：可編程操控器是一種數(shù)字運算操作的電子體系，專為在工業(yè)環(huán)境下運用而規(guī)劃。它選用可編程序的存貯器，用來在其內(nèi)部存貯履行邏輯運算、次序操控、守時、計數(shù)和算術(shù)運算等操作的指令，并經(jīng)過數(shù)字量、模仿量的輸入和輸出，操控各品種型的機械或出產(chǎn)進(jìn)程。可編程序操控器及其有關(guān)設(shè)備，都應(yīng)按易于與工業(yè)操控體系構(gòu)成一個全體，易于擴大其功用的準(zhǔn)則規(guī)劃。

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