推荐回答（3个）
你的问题太笼统了，不好回答，没有具体的PLC型号和变频器的型号，我只能说下控制原理及实现方法
1.串行通信（通常是RS485），需要知道变频器的通信协议，然后PLC编程控制PLC的串行口发送命令代码给变频器的串行口，变频器执行指令实现控制；
2.模拟量控制，PLC加模拟量模块（4-20mA或者电压值）与变频器的模拟量接口连接，PLC编程控制模拟量模块的输出值（电流或者电压值）来控制变频器；
3.分段控制，及变频器分为若干个频率点，每个点代表不同的频率（及电机转速），通过PLC的开关量来控制变频器的每个频率点的开关来操作变频器。
大概就这几种吧
另外百度文库里有教程，你可以搜索下
哥们.你这样说的是什么来的啊？都不知道你要通讯什么？
三菱PLC你要和什么通讯和变频器通讯还是和仪表通讯，别人好回答你
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