Allen-Bradley 1756-L72
Allen-Bradley 1756-L72
Allen-Bradley 1756-L72
聯(lián)系人:劉經(jīng)理
手機:15359273796 與微信號一致
企業(yè)QQ:3005394867 3005395729
電話:0592-5580706 15359273796
可編程操控器是60年代末在美國首先出現(xiàn),當(dāng)時叫可編程邏輯操控器PLC(Programmable Logic Controller),意圖是用來取代繼電器,以履行邏輯判斷、計時、計數(shù)等順序操控功用。PLC的根本設(shè)計思想是把計算機功用完善、靈敏、通用等長處和繼電器操控系統(tǒng)的簡單易懂、操作便利、價格便宜等長處結(jié)合起來,操控器的硬件是標(biāo)準(zhǔn)的、通用的。依據(jù)實際應(yīng)用目標(biāo),將操控內(nèi)容編成軟件寫入操控器的用戶程序存儲器內(nèi)。操控器和被控目標(biāo)連接便利。
隨著半導(dǎo)體技術(shù),尤其是微處理器和微型計算機技術(shù)的發(fā)展,到70年代中期以后,PLC已廣泛地使用微處理器作為中央處理器,輸入輸出模塊和外圍電路也都采用了中、大規(guī)模甚至超大規(guī)模的集成電路,這時的PLC已不再是邏輯判斷功用,還同時具有數(shù)據(jù)處理、PID調(diào)理和數(shù)據(jù)通信功用。
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