- 艾寶物聯(lián)IOBOV? ─ 工業(yè)無(wú)線測(cè)控專(zhuān)家
圖4-49是由兩個(gè)計(jì)數(shù)器組成的延時(shí)電路。輸入Ⅹ0端接通后,CT100開(kāi)始對(duì)R901C(1s時(shí)鐘脈沖)進(jìn)行減計(jì)數(shù)。經(jīng)過(guò)20s,CT100有輸出,其常開(kāi)觸點(diǎn)C100閉合。CT101對(duì)C100常開(kāi)觸點(diǎn)的動(dòng)作計(jì)數(shù)一次。與此同時(shí)C100常開(kāi)觸點(diǎn)也將CT100復(fù)位,C100常開(kāi)觸點(diǎn)又?jǐn)嚅_(kāi),CT100繼續(xù)對(duì)R901C計(jì)數(shù)。又經(jīng)過(guò)20s,CT101又對(duì)C100常開(kāi)觸點(diǎn)計(jì)數(shù)一次……。如此循環(huán),經(jīng)過(guò)20s×30=600s后,CT101有輸出,其常開(kāi)觸點(diǎn)C101閉合,接通輸出繼電器Y0。
圖4-49 采用計(jì)數(shù)器組成的延時(shí)電路