1968年美國的汽車制造商―通用汽車（GM）公司，為適應汽車型號不斷更新，提出把計算機的完備功能以及靈活性、通用性好等優(yōu)點和繼電器一接觸器控制系統(tǒng)的簡單易懂、操作方便、價格便宜等優(yōu)點結合起來，做成一種能適應工業(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化，使不熟悉計算機的人員也能很快掌握它的使用技術。根據(jù)這一設想，美國數(shù)字設備公司（DEC）于1969年率先研制出臺可編程序控制器（簡稱PLC），在通用汽車公司的自動裝配線上試用獲得成功。從此以后，許多國家的廠商競相研制，各自形成系列，而且品種更新很快，功能不斷增強，從初的邏輯控制為主發(fā)展到能進行模擬量控制，具有數(shù)據(jù)運算、數(shù)據(jù)處理和通信聯(lián)網(wǎng)等多種功能。PLC另一個突出優(yōu)點是可靠性很高，平均無故障運行時間可達10萬小時以上，可以大大減少設備維修費用和停產(chǎn)造成的經(jīng)濟損失。當前PLC已經(jīng)成為電氣自動控制系統(tǒng)中應用為廣泛的核心裝置。
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