1771-KF大多數(shù)PLC的定時(shí)器均為接通延時(shí)定時(shí)器,即定時(shí)器線圈通電后開(kāi)始延時(shí),待定時(shí)時(shí)間到,定時(shí)器的常開(kāi)觸點(diǎn)閉合、常閉觸點(diǎn)斷開(kāi)。在定時(shí)器線圈斷電時(shí),定時(shí)器的觸點(diǎn)立刻復(fù)位。
如圖5-9所示為斷開(kāi)延時(shí)程序的梯形圖和動(dòng)作時(shí)序圖。當(dāng)X13接通時(shí),M0線圈接通并自鎖,Y3線圈通電,這時(shí)T13由于X13常閉觸點(diǎn)斷開(kāi)而沒(méi)有接通定時(shí);當(dāng)X13斷開(kāi)時(shí),X13的常閉觸點(diǎn)恢復(fù)閉合,T13線圈得電,開(kāi)始定時(shí)。經(jīng)過(guò)10s延時(shí)后,T13常閉觸點(diǎn)斷開(kāi),使M0復(fù)位,Y3線圈斷電,從而實(shí)現(xiàn)從輸入信號(hào)X13斷開(kāi),經(jīng)10s延時(shí)后,輸出信號(hào)Y3才斷開(kāi)的延時(shí)功能。
圖5-9 斷電延時(shí)動(dòng)作的程序
a)梯形圖 b)時(shí)序圖
1771-KF一般PLC的一個(gè)定時(shí)器的延時(shí)時(shí)間都較短,如FX系列PLC中一個(gè)0.1s定時(shí)器的定時(shí)范圍為0.1~3276.7s,如果需要延時(shí)時(shí)間更長(zhǎng)的定時(shí)器,可采用多個(gè)定時(shí)器串級(jí)使用來(lái)實(shí)現(xiàn)長(zhǎng)時(shí)間延時(shí)。定時(shí)器串級(jí)使用時(shí),其總的定時(shí)時(shí)間為各定時(shí)器定時(shí)時(shí)間之和。
如圖5-10所示為定時(shí)時(shí)間為1h的梯形圖及時(shí)序圖,輔助繼電器M1用于定時(shí)啟停控制,采用兩個(gè)0.1s定時(shí)器T14和T15串級(jí)使用。當(dāng)T14開(kāi)始定時(shí)后,經(jīng)1800s延時(shí),T14的常開(kāi)觸點(diǎn)閉合,使T15再開(kāi)始定時(shí),又經(jīng)1800s的延時(shí),T15的常開(kāi)觸點(diǎn)閉合,Y4線圈接通。從X14接通,到Y4輸出,其延時(shí)時(shí)間為1800s+1800s=3600s=1h。
圖5-10 用定時(shí)器串級(jí)的長(zhǎng)延時(shí)程序
a)梯形圖 b)時(shí)序圖 SHAPE \* MERGEFORMAT
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