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特點順序控制系統(tǒng)是指按照預定的受控執(zhí)行機構(gòu)動作順序及相應的轉(zhuǎn)步條件，一步一步進行的自動控制系統(tǒng)。其受控設(shè)備通常是動作順序不變或相對固定的生產(chǎn)機械。這種控制系統(tǒng)的轉(zhuǎn)步主令信號大多數(shù)是行程開關(guān)（包括有觸點或無觸點行程開關(guān)、光電開關(guān)、干簧管開關(guān)、霍爾元件開關(guān)等位置檢測開關(guān)），有時也采用壓力繼電器、時間繼電器之類的信號轉(zhuǎn)換元件作為某些步的轉(zhuǎn)步主令信號。

????為了使順序控制系統(tǒng)工作可靠，通常采用步進式順序控制電路結(jié)構(gòu)。所謂步進式順序控制，是指控制系統(tǒng)的任一程序步（以下簡稱步）的得電必須以前一步的得電并且本步的轉(zhuǎn)步主令信號已發(fā)出為條件。對生產(chǎn)機械而言，受控設(shè)備任一步的機械動作是否執(zhí)行，取決于控制系統(tǒng)前一步是否已有輸出信號及其受控機械動作是否已完成。若前一步的動作未完成，則后一步的動作無法執(zhí)行。這種控制系統(tǒng)的互鎖嚴密，即便轉(zhuǎn)步主令信號元件失靈或出現(xiàn)誤操作，亦不會導致動作順序錯亂。

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廈門莫格電氣自動化有限公司 ? ??
聯(lián)系人：張芳（銷售工程師） ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??
手 ? 機：17750626260
Q ? ? Q：177763184 ? ? ? ? ? ? ? ? ? ? ? ?
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傳 ? ?真：0596-6514751（請備注張工收） ?
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