Motion control system requires high-speed signal process, convenient networking capability, and visual human machine interface (HMI). LabVIEW possesses graphical programming language and strong communication function. In order to introduce it into existing electrical experiment teaching, LabVIEW software was adopted to develop HMI to replace touch screen for the upper computer of the new platform, while Twidosoft software was choose to realize communication and process program for lower computer. Modbus was used for communication protocol between PC and PLC, and CANopen was used for protocol between PLC and servo driver. The "PC + PLC + Servo driver" mode was adopted for the whole structure of the system. By introducing LabVIEW into motion control system, supervisory control and data acquisition (SCADA) and HMI was conveniently realized, and expansibility of original platform was improved greatly.%运动控制系统实验平台即要求高速的信号处理能力,强大的组网能力,又要求有可视化的控制视图.为了将LabVIEW引入到现有运动控制实验教学中,改造的平台采用LabVIEW开发平台设计上位机的人机交互界面以取代传统实验平台的触控屏,下位机的通信程序以及工艺程序则通过Twidosoft编程软件实现.PC机与PLC的通信基于Modbus串行总线;PLC与伺服驱动器的通信基于CANopen总线,整个运动控制系统实验平台为“PC+PLC+伺服驱动器”的结构模式.LabVIEW在运动控制系统平台的引入,可以方便地实现数据采集和监视控制功能,直观且逼真地显示伺服电机的控制,较好地提高了原有实验平台的功能扩展性.
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