描述
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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