描述
相高速計(jì)數(shù)器
C235~C240為一相無起動(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指令來復(fù)位。
圖1中的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來立即復(fù)位外,也可以在梯形圖中用復(fù)位指令復(fù)位。
3.兩相雙向計(jì)數(shù)器
兩相雙向計(jì)數(shù)器(C246~C250)有一個(gè)加計(jì)數(shù)輸入端和一個(gè)減計(jì)數(shù)輸入端,例如C246的加、減計(jì)數(shù)輸入端分別是X0和Xl,在計(jì)數(shù)器的線圈通電時(shí),在X0的上升沿,計(jì)數(shù)器的當(dāng)前值加1,在X1的上升沿,計(jì)數(shù)器的當(dāng)前值減l。某些計(jì)數(shù)器還有復(fù)位和起動(dòng)輸入端。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
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4,《DCS集散控制系統(tǒng)》
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