基于USS和Modbus通信协议的S7-200与MM420变频器的控制网络的研究

Control Network S7-200 and MM420 Converter Based on USS and Modbus Communication Protocol

针对USS通信的固定性,结合Modbus通信方便、统一的特点。以MM420变频器为例阐述了一种基于USS和Modbus通信的S7-200系列PLC的控制网络的研究,重点介绍了MM420变频器功能测试的设置、USS通信的实现以及如何与Modbus通信相结合。通过Mobus通信就可以控制变频器的运行参数,可以在一些相关领域中加以推广。

According to the fixed according to the characteristics of Modbus communication is convenient,unified USS communication.To MM420 converter as an example introduces a study of control network of USS and S7-200 series Modbus communication based on PLC,mainly introduces the realization of USS communication setting,MM420 converter function testand how to communicate with Modbus combination.