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大賣特賣   FANUC 發(fā)那科  A20B-8100-0730，大賣特賣   FANUC 發(fā)那科  A20B-8100-0730，大賣特賣   FANUC 發(fā)那科  A20B-8100-0730

數(shù)控機(jī)床用“內(nèi)裝型”PLC的結(jié)構(gòu)特點(diǎn)和主要型號(hào)      

“內(nèi)裝型”PLC（或稱“內(nèi)含型”PLC、“集成式”PLC）從屬于CNC裝置，PLC與NC間的信號(hào)傳送在CNC裝置內(nèi)部即可實(shí)現(xiàn)。PLC與MT間則通過(guò)CNC輸入／輸出接口電路實(shí)現(xiàn)信號(hào)傳送（如圖1所示）。

 

圖1  具有內(nèi)裝型PLC的CNC機(jī)床系統(tǒng)框圖

 內(nèi)裝型PLC有如下特點(diǎn)：

 1）內(nèi)裝型PLC實(shí)際上是CNC裝置帶有的PLC功能，一般是作為一種基本的或可選擇的功能提供給用戶。

 2）內(nèi)裝型PLC的性能指標(biāo)（如：輸入／輸出點(diǎn)數(shù)，程序最大步數(shù)，每步執(zhí)行時(shí)間、程序掃描周期、功能指令數(shù)目等）是根據(jù)所從屬的CNC系統(tǒng)的規(guī)格、性能、適用機(jī)床的類型等確定的。其硬件和軟件部分是被作為CNC系統(tǒng)的基本功能或附加功能與CNC系統(tǒng)其他功能一起統(tǒng)一設(shè)計(jì)、制造的。因此，系統(tǒng)硬件和軟件整體結(jié)構(gòu)十分緊湊，且PLC所具有的功能針對(duì)性強(qiáng)，技術(shù)指標(biāo)亦較合理、實(shí)用，尤其適用于單機(jī)數(shù)控設(shè)備的應(yīng)用場(chǎng)合。

 3）在系統(tǒng)的具體結(jié)構(gòu)上，內(nèi)裝型PLC可與CNC共用CPU，也可以單獨(dú)使用一個(gè)CPU；硬件控制電路可與CNC其他電路制作在同一塊印刷板上，也可以單獨(dú)制成一塊附加板，當(dāng)CNC裝置需要附加PLC功能時(shí)，再將此附加板插裝到CNC裝置上，內(nèi)裝PLC一般不單獨(dú)配置輸入／輸出接口電路，而是使用CNC系統(tǒng)本身的輸入／輸出電路；PLC控制電路及部分輸入／輸出電路（一般為輸入電路）所用電源由CNC裝置提供，不需另備電源。

 4）采用內(nèi)裝型PLC結(jié)構(gòu)，CNC系統(tǒng)可以具有某些高級(jí)的控制功能。如：梯形圖編輯和傳送功能，在CNC內(nèi)部直接處理NC窗口的大量信息等。

 自70年代末以來(lái)，世界上著名的CNC廠家在其生產(chǎn)的CNC產(chǎn)品中，大多開(kāi)發(fā)了內(nèi)裝型PLC功能。隨著大規(guī)模集成電路的開(kāi)發(fā)利用，帶與不帶PLC功能，CNC裝置的外形尺寸已沒(méi)有明顯的變化。一般來(lái)說(shuō)，采用內(nèi)裝型PLC省去了PLC與NC間的連線，又具有結(jié)構(gòu)緊湊、可靠性好、安裝和操作方便等優(yōu)點(diǎn)，和在擁有CNC裝置后，又去另外配購(gòu)一臺(tái)通用型PLC作控制器的情況相比較，無(wú)論在技術(shù)上還是經(jīng)濟(jì)上對(duì)用戶來(lái)說(shuō)都是有利的。

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