用S7-200PLC的高速输出口实现步进电机位置控制的设想

介绍了以拉丝机排线器的往复控制为例,用脉冲串输出指令,结合中断控制技术,通过编程实现参考点寻找、往复控制等位置控制的方法,既充分利用CPU本身的资源,也节省控制系统的硬件配置.用PLC实现步进电机的位置控制一般采用专用的位控模块.西门子S7-200 PLC集成有两路20 kHz的高速输出口,如能很好的利用,可以代替位控模块实现位置控制.

CONCEPT OF POSITION CONTROL BY STEP MOTOR USING HIGH-SPEED OUTLETS OF S7-200 PLC

For the control of reciprocation of the traverse of a strand winder,the use of pulse train output instruction in combination with interrupt control technology to find reference point by programming can not only make full use of the resourses of CPU itself,but alse save the hardware configuration of the control system. The position control by a step motor is usually done by position control modules. However,SIEMENS S7-200 PLC integrate has two high-speed outlets of 20 kHz,which can replace the modules for position control if they are properly used.