MVME147-011
廠家基于PLC的特點(diǎn),PLC已得到廣泛的應(yīng)用。目前主要是:
用于順序控制
順序控制是根占有關(guān)輸進(jìn)開關(guān)量確當(dāng)前與歷史的狀況,產(chǎn)生所要求的開關(guān)量輸出,以使系統(tǒng)能按一定順序工作。這是系統(tǒng)工作最基本的控制。也是離散生產(chǎn)過程最常用的控制。
常用的順序控制有:
隨機(jī)控制,根據(jù)隨機(jī)出現(xiàn)的條件實(shí)施控制;
動(dòng)作控制,根據(jù)動(dòng)作完成的情況實(shí)施控制;
時(shí)間控制,根據(jù)時(shí)間推進(jìn)的進(jìn)程實(shí)施控制;
計(jì)數(shù)控制,根據(jù)累計(jì)計(jì)數(shù)的情況實(shí)施控制;
混合控制,包含有以上幾種控制的組合;
還有不同以上的其它控制,等等。
使用PLC實(shí)現(xiàn)順序控制是PLC的初衷,也是它的強(qiáng)項(xiàng)。在順序控制領(lǐng)域,至今還沒有別的控制器能夠取代它。
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