描述
C235~C240为一相无起动/复位输入端的高速计数器,C24l~C245为一相带起动/复位端的高速计数器,可用M8235~M8245来设置C235~C2415的计数方向,M为ON时为减计数,为OFF时为加计数。C235~C240只能用RST指令来复位。
图1中的C244是1相带起动/复位端的高速计数器,由表1可知,Xl和X6分别为复位输入端和起动输入端,它们的复位和起动与扫描工作方式无关,其作用是立即的和直接的。如果X12为ON,一旦X6变为ON,立即开始计数,计数输入端为X0。X6变为OFF,立即停止计数,C244的设定值由D0和D1指定。除了用Xl来立即复位外,也可以在梯形图中用复位指令复位。
3.两相双向计数器
两相双向计数器(C246~C250)有一个加计数输入端和一个减计数输入端,例如C246的加、减计数输入端分别是X0和Xl,在计数器的线圈通电时,在X0的上升沿,计数器的当前值加1,在X1的上升沿,计数器的当前值减l。某些计数器还有复位和起动输入端。
4.A-B相型双计数输入高速计数器
C25l~C255为A–B相型双计数输入高速计数器,它们有两个计数输入端,某些计数器还有复位和起动输入端。
图2中的X12为ON时,C25l通过中断,对X0输入的A相信号和X1输入的B相信号的动作计数。X11为ON时C251被复位,当计数值大于等于设定值时,Y2的线圈通电,若计数值小于设定值,Y2的线圈断电。
A/B相输入不仅提供计数信号,根据它们的相对相位关系,还提供了计数的方向。利用旋转轴上安装的A/B相型编码器,在机械正转时自动进行加计数,反转时自动进行减计数。A相输入为ON时,若B相输入由OFF变为ON,为加计数(见图2b);A相为ON时,若B相由ON变为OFF,为减计数(见图2c)。通过M8251可监视C251的加/减计数状态,加计数时M8251为OFF,减计数时M8251为ON。
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