With the example of the MELSEC-FX2N PLC and the FR-S500 inverters,the port communication technology of VVVF are introduced,and by the part of the communication control program,the paper explains the method of the port communication program by PLC.

• 以三菱FX2N型PLC及三菱FR-S500变频器为例,介绍串行通信技术在交流变频调速控制系统中的应用,并通过相应的部分通信控制程序来说明利用可编程控制器实现串行通信编程设计方法。