｛IC693ACC309*%140ARI03010｝

IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309IC693ACC309

通過切斷與驅(qū)動程序的聯(lián)系而自復(fù)位的定時器，常被叫做“自切斷”定時器。它們是編程者“工具箱”里一個很有用的工具。下面例子不是一個完整的實際應(yīng)用，而是經(jīng)選擇，突出“自切斷”定時器的操作。

 

說明:

定時器T001連續(xù)運行，定時器線圈由它自己的常閉觸點驅(qū)動。當定時器完成定時過程，線圈被激活，使定時器常閉觸點無效，通路被打斷，由此線圈不能通電。這個新狀態(tài)也意味著常閉觸點不能再通電。因此，*后情況是定時器復(fù)位并且自動地再次開始它的定時過程。

這是一個很快的響應(yīng)。定時器的復(fù)位/置位會在程序的大約一次掃描(*多兩次掃描)內(nèi)發(fā)生。在如此短的時間內(nèi)，定時器的連續(xù)置位和復(fù)位使定時器觸點動作如同受脈沖激勵。使用定時器T001的常開觸點驅(qū)動ALT指令說明了這一點。每過20秒，Y001和Y002的輸出狀態(tài)互換。

在這個例子中，變化著的輸出對配給雜志的線路進行切換，20秒的停頓用于雜志沿傳送帶下移并的停倒入等待盒中。這樣能*保*一個穩(wěn)定的生產(chǎn)流程，這個過程很容易由照看雜志裝箱的一個操作人員管理。

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