這個小程序在PC一投入運行就開始工作。其操作的關鍵在于專用輔助繼電器M8013，這個元件提供一個周期為1秒的脈沖。計數(shù)器根據(jù)這個“時鐘脈沖”對過去的時間以秒計數(shù)。如果這個計數(shù)器到了60就復位，便可知道過去了一分鐘。

    如果第二個計數(shù)器對計數(shù)器C000復位次數(shù)計數(shù)，則可知道過去了多少分鐘。

    因此，接下來的邏輯與前面相同，只是用C001來計“分”。再進一步，用C002來計“時”，從而完成一個完全獨立的時鐘。時間可從3個計數(shù)器上直接讀出。使C002的“設定”值等于24，就得到一個24小時時鐘，或者設定值等于12時，一個標準的12小時時鐘就能工作了。

（圖片只做參考，不代表實物圖，價格和具體內(nèi)容請電詢，感謝您的配合）

聯(lián)系人；陳如


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