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可編程控制器,變頻器,RS-485 在PLC與變頻器的綜合應(yīng)用中,比較傳統(tǒng)的應(yīng)用一般是使用PLC的硬接點輸出控制變頻器的運(yùn)行及停止,使用多段速度或D/A輸出控制變頻器的轉(zhuǎn)速變化,在這種應(yīng)用方式中,PLC與變頻器通過外部接線完成連接,不能進(jìn)行內(nèi)部數(shù)據(jù)的傳遞;而使用RS-485通訊控制,僅通過一條通訊電纜連接,無需其他外部接線,不但能完成傳統(tǒng)應(yīng)用的所有功能,還能進(jìn)行內(nèi)部的數(shù)據(jù)通訊,可方便地從變頻器中獲取所驅(qū)動的電動機(jī)各種電參數(shù)如:運(yùn)行頻率、電流、電壓、功率等等,配以人機(jī)界面的話,可將上述電參數(shù)直接顯示在人機(jī)界面上。下面介紹三菱的FX系列PLC與三菱變頻器的FR-S540的RS-485通訊。
PLC與變頻器通訊的硬件連接 三菱變頻器有一個稱為Pu的口,用于連接變頻器的操作單元。這個Pu口是個RS-485的接口,利用這個接口可以用上位機(jī)(PLC或計算機(jī))對變頻器進(jìn)行參數(shù)讀寫、開機(jī)、關(guān)機(jī)、改變運(yùn)行頻率等操作。RS-485接口采用差動輸人和差動輸出,具有較強(qiáng)的抗干擾能力,非常適合于環(huán)境惡劣的現(xiàn)場工作。由于采用RS-485連接,因此1臺計算機(jī)多可控制32臺變頻器。對于一般計算機(jī),機(jī)上只配有RS-232C接口,因此為與變頻器的Pu口相連,必須配置有485接口卡或RS-232C/RS-485轉(zhuǎn)換器。
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