介绍了以西门子PLC200与变频器的USS通讯协议进行网络通讯构成的变频控制系统。讨论了USS协议对变频器进行控制的方法和程序设计。该系统可以对各变频器的运行参数进行在线监测,并进行远程控制,能有效地减少系统布线、提高系统的抗干扰能力,为变频控制系统提供了一个低成本和高性能的方案。 The frequency conversion control system composed of the network communication of Siemens PLC200 and USS communication protocol of inverter is introduced. Discusses the USS protocol on the inverter control method and program design. The system can monitor the running parameters of each inverter on-line and carry out remote control, which can effectively reduce system wiring and improve anti-interference ability of the system, providing a low-cost and high-performance scheme for the frequency conversion control system.