描述
一相高速計(jì)數(shù)器
C235~C240為一相無(wú)起動(dòng)/復(fù)位輸入端的高速計(jì)數(shù)器,C24l~C245為一相帶起動(dòng)/復(fù)位端的高速計(jì)數(shù)器,可用M8235~M8245來(lái)設(shè)置C235~C2415的計(jì)數(shù)方向,M為ON時(shí)為減計(jì)數(shù),為OFF時(shí)為加計(jì)數(shù)。C235~C240只能用RST指令來(lái)復(fù)位。
C244是1相帶起動(dòng)/復(fù)位端的高速計(jì)數(shù)器,由表1可知,Xl和X6分別為復(fù)位輸入端和起動(dòng)輸入端,它們的復(fù)位和起動(dòng)與掃描工作方式無(wú)關(guān),其作用是立即的和直接的。如果X12為ON,一旦X6變?yōu)镺N,立即開(kāi)始計(jì)數(shù),計(jì)數(shù)輸入端為X0。X6變?yōu)镺FF,立即停止計(jì)數(shù),C244的設(shè)定值由D0和D1指定。除了用Xl來(lái)立即復(fù)位外,也可以在梯形圖中用復(fù)位指令復(fù)位。
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