点击图片查看大图TRICONEX 3008
TRICONEX 3008
优点：硬件简单、造价最低，可控制32台变频器。
缺点：编程工作量较大。从本文的第二章可知：采用扩展存储器通讯控制的编程极其简单，从事过PLC编程的技术人员只要知道怎样查表，仅仅数小时即可掌握，增加的硬件费用也很低。这种方法编程的轻松程度，是采用RS-485无协议通讯控制变频器的方法所无法相比的。
3.4PLC采用RS-485的Modbus-RTU通讯方法控制变频器
三菱新型F700系列变频器使用RS-485端子利用Modbus-RTU协议与PLC进行通讯。
优点：Modbus通讯方式的PLC编程比RS-485无协议方式要简单便捷。
缺点：PLC编程工作量仍然较大。
3.5PLC采用现场总线方式控制变频器
三菱变频器可内置各种类型的通讯选件，如用于CC-link 现场总线的FR-A5NC选件；用于ProfibusDP现场总线的FR-A5AP(A)选件；用于DeviceNet现场总线的FR-A5ND选件等等。三菱FX系列PLC有对应的通讯接口模块与之对接。
优点：速度快、距离远、效率高、工作稳定、编程简单、可连接变频器数量多。
缺点：造价较高，远远高于采用扩展存储器通讯控制的造价。
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