6GK7 243-1EX00-0XE0
6GK7 243-1EX00-0XE0
6GK7 243-1EX00-0XE0
6GK7 243-1EX00-0XE0
交流調(diào)速的發(fā)展十分迅速，打破了過去直流拖動在調(diào)速領(lǐng)域中的統(tǒng)治地位，交流調(diào)速拖動已進(jìn)入了與直流拖動相媲美、相抗衡的時代。目前，變頻器調(diào)速控制系統(tǒng)已廣泛應(yīng)用于機械、冶金、化工等各個行業(yè)。作為變頻調(diào)速系統(tǒng)中的控制核心部分的變頻器,最初是以單臺形式工作的,可以通過變頻器的控制面板或端子進(jìn)行運行參數(shù)的設(shè)置,啟動或停止變頻器運行,讀取各種變頻器運行數(shù)據(jù)等等。而現(xiàn)在各種大中型自動化生產(chǎn)線則要求由多臺變頻器組成的同步控制系統(tǒng)、比例控制系統(tǒng)等復(fù)雜的控制,并且要相互協(xié)調(diào),形成連續(xù)生產(chǎn)線的調(diào)速控制系統(tǒng)。
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本文是用三菱FX2NPLC通過RS485接口使用變頻器專用通訊協(xié)議對多臺三菱變頻器進(jìn)行控制，本文著重介紹了三菱變頻器實時在線通訊技術(shù)的實現(xiàn)。
二 設(shè)計原理
1 在本課題中， 用比較通用一臺三菱FX2N PLC ，F(xiàn)R- - E540 系列變頻器多臺，F(xiàn)X2N-485-BD一個， PU04一個， 三菱F930觸摸屏一個。 導(dǎo)線及人機界面通訊線。
使用的軟件有觸摸屏的編寫界面軟件 PCS-DU-WIN 及PLC的編程軟件FXGPWIN。
三菱變頻器的操作面板接口即是一個RS-485串行數(shù)據(jù)通訊接口,在三菱FX系列PLC擴展一個RS-485通訊模塊(型號：FX-485-BD，市場價格僅200元左右),再配備一根5芯的通訊電纜將變頻器485通訊接口同PLC的485通訊模板相連接，就能夠?qū)崿F(xiàn)可編程控制器PLC通過RS-485通訊對變頻器幾乎所有運行功能的控制，包括變頻器的正反轉(zhuǎn)控制.點動.多段速度選擇運行. 頻率的連續(xù)無極給定及電機電流.轉(zhuǎn)速與故障的監(jiān)視(PLC需配備觸摸屏，通過觸摸屏進(jìn)行電機頻率設(shè)定及電流。
在設(shè)計軟件方面，首先對變頻器通訊環(huán)境進(jìn)行參數(shù)設(shè)置，包括站號.波特率.奇偶校驗等。然后，根據(jù)變頻器的通訊協(xié)議，運用三菱可編程控制器的串行數(shù)據(jù)通訊RS指令，作出PLC對變頻器實行控制的梯形圖程序。如果配有觸摸屏，可將觸摸屏的軟件設(shè)計也納入對變頻器的監(jiān)控中，以實現(xiàn)變頻器更多的控制.運行.顯示功能
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