1968年美國(guó)的汽車(chē)制造商―通用汽車(chē)（GM）公司，為適應(yīng)汽車(chē)型號(hào)不斷更新，提出把計(jì)算機(jī)的完備功能以及靈活性、通用性好等優(yōu)點(diǎn)和繼電器一接觸器控制系統(tǒng)的簡(jiǎn)單易懂、操作方便、價(jià)格便宜等優(yōu)點(diǎn)結(jié)合起來(lái)，做成一種能適應(yīng)工業(yè)環(huán)境的通用控制裝置，并把編程方法和程序輸入方式加以簡(jiǎn)化，使不熟悉計(jì)算機(jī)的人員也能很快掌握它的使用技術(shù)。根據(jù)這一設(shè)想，美國(guó)數(shù)字設(shè)備公司（DEC）于1969年率先研制出臺(tái)可編程序控制器（簡(jiǎn)稱(chēng)PLC），在通用汽車(chē)公司的自動(dòng)裝配線上試用獲得成功。從此以后，許多國(guó)家的廠商競(jìng)相研制，各自形成系列，而且品種更新很快，功能不斷增強(qiáng)，從初的邏輯控制為主發(fā)展到能進(jìn)行模擬量控制，具有數(shù)據(jù)運(yùn)算、數(shù)據(jù)處理和通信聯(lián)網(wǎng)等多種功能。PLC另一個(gè)突出優(yōu)點(diǎn)是可靠性很高，平均無(wú)故障運(yùn)行時(shí)間可達(dá)10萬(wàn)小時(shí)以上，可以大大減少設(shè)備維修費(fèi)用和停產(chǎn)造成的經(jīng)濟(jì)損失。當(dāng)前PLC已經(jīng)成為電氣自動(dòng)控制系統(tǒng)中應(yīng)用為廣泛的核心裝置。
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