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900G02-0001

發(fā)布者：廈門(mén)興潤(rùn)星貿(mào)易有限公司發(fā)布時(shí)間：2016-07-21 10:23:57 訪問(wèn)次數(shù)：51

900G02-0001 900G02-0001

900G02-0001

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獨(dú)立型PLC有如下特點(diǎn)：
1）獨(dú)立型PLC具有如下基本的功能結(jié)構(gòu)：CPU及其控制電路，系統(tǒng)程序存儲(chǔ)器，用戶程序存儲(chǔ)器、輸入／輸出接口電路、與編程機(jī)等外部設(shè)備通信的接口和電源等（參見(jiàn)圖5-2）。
2）獨(dú)立型PLC一般采用積木式模塊化結(jié)構(gòu)或籠式插板式結(jié)構(gòu)，各功能電路多做成獨(dú)立的模塊或印刷電路插板，具有安裝方便，功能易于擴(kuò)展和變更等優(yōu)點(diǎn)。例如，可采用通信模塊與外部輸入輸出設(shè)備、編程設(shè)備、上位機(jī)、下位機(jī)等進(jìn)行數(shù)據(jù)交換；采用D／A模塊可以對(duì)外部伺服裝置直接進(jìn)行控制；采用計(jì)數(shù)模塊可以對(duì)加工工件數(shù)量、刀具使用次數(shù)、回轉(zhuǎn)體回轉(zhuǎn)分度數(shù)等進(jìn)行檢測(cè)和控制，采用定位模塊可以直接對(duì)諸如刀庫(kù)、轉(zhuǎn)臺(tái)、直線運(yùn)動(dòng)軸等機(jī)械運(yùn)動(dòng)部件或裝置進(jìn)行控制。
3）獨(dú)立型PLC的輸入、輸出點(diǎn)數(shù)可以通過(guò)I／O模塊或插板的增減靈活配置。有的獨(dú)立型PLC還可通過(guò)多個(gè)遠(yuǎn)程終端連接器構(gòu)成有大量輸入、輸出點(diǎn)的網(wǎng)絡(luò)，以實(shí)現(xiàn)大范圍的集中控制。

在獨(dú)立型PLC中，那些專(zhuān)為用于FMS、FA而開(kāi)發(fā)的獨(dú)立型PLC具有強(qiáng)大的數(shù)據(jù)處理、通信和診斷功能，主要用作“單元控制器”，是現(xiàn)代自動(dòng)化生產(chǎn)制造系統(tǒng)重要的控制裝置。獨(dú)立型PLC也用于單機(jī)控制。國(guó)外有些數(shù)控機(jī)床制造廠家，或是為了展示自己長(zhǎng)期形成的技術(shù)特色，或是為了保守某些技術(shù)絕竅，或純粹是因管理上的需要，在購(gòu)進(jìn)的CNC系統(tǒng)中，舍棄了PLC功能，而采用外購(gòu)或自行開(kāi)發(fā)的獨(dú)立型PLC作控制器，這種情況在從日本、歐美引進(jìn)的數(shù)控機(jī)床中屢見(jiàn)不鮮。

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