介绍了如何实现S7—300网络硬件组态和参数设置、变频器硬件设置以及参数设定,利用两种编程方式通过Profibus-DP网络完成PLC与变频器之间的数据交换,实现变频器的起动/停止、变频调速等功能,对控制字、状态字、设定频率以及反馈的实际频率状态进行了在线监视,证实了程序的可行性和正确性。 Introduced how to realize the hardware configuration and parameter setting of S7-300 network, the setting of the hardware and the parameter setting of the inverter, and realized the data exchange between PLC and frequency converter by using two kinds of programming methods to realize the starting of the frequency converter / Stop, frequency control and other functions, the control word, the status word, the set frequency and the actual frequency of feedback on-line monitoring, confirmed the feasibility and accuracy of the program.