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.

• 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。