ABB 6009BZ10000K
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特點順序控制系統(tǒng)是指按照預定的受控執(zhí)行機構動作順序及相應的轉步條件,一步一步進行的自動控制系統(tǒng)。其受控設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)的轉步主令信號大多數(shù)是行程開關(包括有觸點或無觸點行程開關、光電開關、干簧管開關、霍爾元件開關等位置檢測開關),有時也采用壓力繼電器、時間繼電器之類的信號轉換元件作為某些步的轉步主令信號。
????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構。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步主令信號已發(fā)出為條件。對生產(chǎn)機械而言,受控設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。
**********************************廈門莫格電氣自動化有限公司 ? ??
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