GE IC697CPU781
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PLC的特點
2.1可靠性高,抗干擾能力強
高可靠性是電氣控制設備的關鍵性能。PLC由于采用現(xiàn)代大規(guī)模集成電路技術,采用嚴格的生產(chǎn)工藝制造,內(nèi)部電路采取了先進的抗干擾技術,具有很高的可靠性。例如三菱公司生產(chǎn)的F系列PLC平均無故障時間高達30萬小時。一些使用冗余CPU的PLC的平均無故障工作時間則更長。從PLC的機外電路來說,使用PLC構(gòu)成控制系統(tǒng),和同等規(guī)模的繼電接觸器系統(tǒng)相比,電氣接線及開關接點已減少到數(shù)百甚至數(shù)千分之一,故障也就大大降低。此外,PLC帶有硬件故障自我檢測功能,出現(xiàn)故障時可及時發(fā)出警報信息。在應用軟件中,應用者還可以編入外圍器件的故障自診斷程序,使系統(tǒng)中除PLC以外的電路及設備也獲得故障自診斷保護。這樣,整個系統(tǒng)具有極高的可靠性也就不奇怪了。
2.2配套齊全,功能完善,適用性強
PLC發(fā)展到今天,已經(jīng)形成了大、中、小各種規(guī)模的系列化產(chǎn)品。可以用于各種規(guī)模的工業(yè)控制場合。除了邏輯處理功能以外,現(xiàn)代PLC大多具有完善的數(shù)據(jù)運算能力,可用于各種數(shù)字控制領域。近年來PLC的功能單元大量涌現(xiàn),使PLC滲透到了位置控制、溫度控制、CNC等各種工業(yè)控制中。加上PLC通信能力的增強及人機界面技術的發(fā)展,使用PLC組成各種控制系統(tǒng)變得非常容易。
2.3易學易用,深受工程技術人員歡迎
PLC作為通用工業(yè)控制計算機,是面向工礦企業(yè)的工控設備。它接口容易,編程語言易于為工程技術人員接受。梯形圖語言的圖形符號與表達方式和繼電器電路圖相當接近,只用PLC的少量開關量邏輯控制指令就可以方便地實現(xiàn)繼電器電路的功能。為不熟悉電子電路、不懂計算機原理和匯編語言的人使用計算機從事工業(yè)控制打開了方便之門。
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廈門莫格電氣自動化有限公司
聯(lián)系人:張芳(銷售工程師)
手 機:17750626260
Q Q:177763184
郵 箱:177763184@qq.com
傳 真:0596-6514751(請備注張工收)
網(wǎng) 址:http://www.mogget.cn/
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