本文讨论利用人机界面和PLC控制步进电机实现数控系统点位控制功能的相关技术，介绍了控制系统方案及软硬件结构的设计思路。
This paper discuss related technologies about stepper motor control system point of nc control functions of HMI and PLC, and introduces the design ideas of control system and soft and hard structure.
该系统以步进电机作为驱动器件，以光栅位移检测装置作为位移检测反馈器件，采用点位控制原理，形成一个闭环似移控制系统。
Point to point control is adopted because a stepping motor is used as a driver. A grating displacement detector is applied in the feedback loop, forming a close loop control system.
该系统以步进电机作为驱动器件，以光栅位移检测装置作为位移检测反馈器件，采用点位控制原理，形成一个闭环似移控制系统。
Point to point control is adopted because a stepping motor is used as a driver. A grating displacement detector is applied in the feedback loop, forming a close loop control system.
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