描述
? 利用定時器與計數(shù)器級聯(lián)組合可以擴大延時時間,如圖5-13所示。圖中T4形成一個20s的自復(fù)位定時器,當(dāng)X4接通后,T4線圈接通并開始延時,20s后T4常閉觸點斷開,T4定時器的線圈斷開并復(fù)位,待下一次掃描時,T4常閉觸點才閉合,T4定時器線圈又重新接通并開始延時。所以當(dāng)X4接通后,T4每過20s其常開觸點接通一次,為計數(shù)器輸入一個脈沖信號,計數(shù)器C4計數(shù)一次,當(dāng)C4計數(shù)100次時,其常開觸點接通Y3線圈??梢姀腦4接通到Y(jié)3動作,延時時間為定時器定時值(20s)和計數(shù)器設(shè)定值(100)的乘積(2000s)。圖中M8002為初始化脈沖,使C4復(fù)位。樣。
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