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Reliance85014-21R驅動操作面板
通訊口已經設置完畢，下面就是如何根據要求將數據發送給變頻器。


對FX2系列的PLC與上拉機的通信實現，提出了一種價格低、體積小的接口方案，討論了其硬件和軟件的設計思想，該接口裝置與控制室和實驗室環境下運行可靠。


關鍵詞：上位機通信接口可編程控制器


PLC作為一種高能的控制裝置，在分布式系統中得到了越來越廣泛的應用。在這種控制方式中，上位機系統是其中重要的組成部分。PLC可以多種方式如直接采用現有的組態軟件與上位監迭機通信，但針對小規模的控制系統，找到一種高能價格比的通信方法，


1通信裝置的硬件描述


之間實現通道，可使二者互補功能上的不足，PLC用于控制方面既方便又可靠，而PC機在圖形顯示、數據處理、打印報表以及中文顯示等方面有很強的功能。因此，各PLC制造廠家紛紛開發了適用于本公司的各種型號PLC與PC機通信的接口模塊。三菱公司開發的FX-232AW接口模塊用于FX2系列PLC與計算機通信。還有與以太網連接的接口模塊AJ71E71、與MAP網連接的接口模塊AJ71M51-S1、與FAIS MAP網連接的接口模塊AJ71M51M1等。不同的通信方式，有著不同的成本價格和不同的適用范圍。在此介紹一種通過PC機的RS-232口與PLC進行通信的實現方法。


FX2系列PLC的編程接口采用RS-422標準，而計算機的串行口采用RS-232標準。因此，作為實現PLC計算機通信的接口電路，必須將RS-422標準轉換成RS-232標準。

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