【導讀】當我們設計機電一體化產(chǎn)品或從事自動化裝置設計時，常常會遇到要求設計出成。本極低，同時能完成較為復雜的邏輯控制的控制器的問題?？删幊绦蚩刂破饕云淇煽俊６?、結(jié)構(gòu)緊湊、價格便宜等特點,在工業(yè)控制中也得到了廣泛的應用。機地結(jié)合,就可實現(xiàn)單片機與PLC之間優(yōu)勢互補,在工業(yè)控制中可發(fā)揮更大的作用[1]，PLC的突出優(yōu)點是可靠性高、接口類型豐富、能適應各種復雜惡劣的工業(yè)環(huán)境，計小型的PLC控制系統(tǒng)有很大的實際意義。三大產(chǎn)系為主的公司，我國的PLC的研究與生產(chǎn)比較晚，但是通過引進國外先進技術(shù)，消化并吸收，近年來，我國的PLC市場發(fā)展的很快，市場前景被十分看好。PLC技術(shù)主要靠引進，自主知識產(chǎn)權(quán)缺乏，與發(fā)達國家。換代對PLC的需求越來越大。足現(xiàn)代化工業(yè)用途的PLC。在可編程控制器誕生之前，繼電器控制在工業(yè)控制領域中占主導地位。PLC設備面向用戶，考慮到現(xiàn)場。目前，大部分的PLC. 目前，大部分的PLC控制系統(tǒng)仍采用模塊化的結(jié)構(gòu)，接線比較少，可編程控制器存在一個

　　

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