1769-IF8臨夏縣
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係列的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,在分布式係統中得到了越來越廣泛的應用。在這種控制方式中,上位機係統是其中重要的組成部分。PLC可以多種方式如直接採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係統,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用於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於本公司的各種型號PLC與PC機通信的接口模塊。三菱公司開發的FX-232AW接口模塊用於FX2係列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範圍。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係列PLC的編程接口採用RS-422標準,而計算機的串行口採用RS-232標準。因此,作為實現PLC計算機通信的接口電路,將RS-422標準轉換成RS-232標準。

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