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為了處理急需呼應(yīng)的輸入信號(hào)，PLC有各種辦法。不一樣的PLC辦法也不徹底一樣，行進(jìn)呼應(yīng)速度的效果也不一樣。通常的作法是選用輸入中止，然后再輸出即時(shí)改寫，即中止程序運(yùn)轉(zhuǎn)后，有關(guān)的輸出點(diǎn)當(dāng)即改寫，而不比及全部程序運(yùn)轉(zhuǎn)完畢后再改寫。
這個(gè)效果可從兩個(gè)方面來(lái)衡量：一是能否對(duì)幾個(gè)輸入信號(hào)作迅速呼應(yīng)；二是迅速呼應(yīng)的速度有多快。大都PLC都可對(duì)一個(gè)或多個(gè)輸入點(diǎn)作迅速呼應(yīng)，迅速呼應(yīng)時(shí)刻僅幾個(gè)毫秒。功用高的、大型的PLC呼應(yīng)點(diǎn)數(shù)更多。
作業(yè)速度聯(lián)絡(luò)到PLC對(duì)輸入信號(hào)的呼應(yīng)速度，是PLC對(duì)體系操控是不是及時(shí)的條件。操控不及時(shí)，就不行能精確與牢靠，特別是對(duì)一些需作迅速呼應(yīng)的體系。這即是把作業(yè)速度作為PLC榜首方針的因素。

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MAGNETEK HP4-1D-T-S1139
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METRO MPS-4007
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MOTOROLA MVME300    11月23日