1785-L80E 1785-L80E A-B價(jià)格正

1785-L80E 1785-L80E A-B價(jià)格正

3．輸入/輸出接口 
（1）輸入接口： 
光電耦合器由兩個(gè)發(fā)光二極度管和光電三極管組成。 
發(fā)光二級(jí)管：在光電耦合器的輸入端加上變化的電信號(hào)，發(fā)光二極管就產(chǎn)生與輸入信號(hào)變化規(guī)律相同的光信號(hào)。 
光電三級(jí)管：在光信號(hào)的照射下導(dǎo)通，導(dǎo)通程度與光信號(hào)的強(qiáng)弱有關(guān)。在光電耦合器的線性工作區(qū)內(nèi)，輸出信號(hào)與輸入信號(hào)有線性關(guān)系。 
輸入接口電路工作過程：當(dāng)開關(guān)合上，二極管發(fā)光，然后三極管在光的照射下導(dǎo)通，向內(nèi)部電路輸入信號(hào)。當(dāng)開關(guān)斷開，二極管不發(fā)光，三極管不導(dǎo)通。向內(nèi)部電路輸入信號(hào)。也就是通過輸入接口電路把外部的開關(guān)信號(hào)轉(zhuǎn)化成PLC內(nèi)部所能接受的數(shù)字信號(hào)。 
（2）輸出接口 
PLC的繼電器輸出接口電路 
工作過程：當(dāng)內(nèi)部電路輸出數(shù)字信號(hào)1，有電流流過，繼電器線圈有電流，然后常開觸點(diǎn)閉合，提供負(fù)載導(dǎo)通的電流和電壓。當(dāng)內(nèi)部電路輸出數(shù)字信號(hào)0，則沒有電流流過，繼電器線圈沒有電流，然后常開觸點(diǎn)斷開，斷開負(fù)載的電流或電壓。也就是通過輸出接口電路把內(nèi)部的數(shù)字電路化成一種信號(hào)使負(fù)載動(dòng)作或不動(dòng)作。 
三種類型： 
繼電器輸出：有觸點(diǎn)、壽命短、頻率低、交直流負(fù)載 
晶體管輸出：無(wú)觸點(diǎn)、壽命長(zhǎng)、直流負(fù)載 
晶閘管輸出：無(wú)觸點(diǎn)、壽命長(zhǎng)、交流負(fù)載 
4．編程器 
編程器分為兩種，一種是手持編程器，方便。我們實(shí)驗(yàn)室使用的就是手持編程器。二種是通過PLC的RS232口。與計(jì)算機(jī)相連。然后敲擊鍵盤。通過NSTP-GR軟件（或WINDOWS下軟件）向PLC內(nèi)部輸入程序。 

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: 陳莉萍（）
4008555103轉(zhuǎn)025  
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