通过变换计数器上的计数方式，可实现自动进给计数和手动快速下降(或上升)计数，并可得到总进尺计数。
By means of conversion switch on counter, the counting assembly may indicate axial travel that the boring bar moves automatically or manually and may indicate total axial travel.
本文采用GE -I系列可编程控制器（PLC）的计数器来模拟鼓形控制器，由于用软件来实现，因此编程、修改灵活方便，而且总步数和输出点数可以满足所有场合的需要。
GE-I Series PLC is used to simulate drum controller in this paper. Because of implement with software, it is easy to modify program, and its total steps, output points can be used in all conditions.
本文采用GE -I系列可编程控制器（PLC）的计数器来模拟鼓形控制器，由于用软件来实现，因此编程、修改灵活方便，而且总步数和输出点数可以满足所有场合的需要。
GE-I Series PLC is used to simulate drum controller in this paper. Because of implement with software, it is easy to modify program, and its total steps, output points can be used in all conditions.
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