1747-L511 1747-L511 A-B 好價格
1747-L511 1747-L511 A-B 好價格
3.輸入/輸出接口
(1)輸入接口:
光電耦合器由兩個發(fā)光二極度管和光電三極管組成。
發(fā)光二級管:在光電耦合器的輸入端加上變化的電信號,發(fā)光二極管就產(chǎn)生與輸入信號變化規(guī)律相同的光信號。
光電三級管:在光信號的照射下導通,導通程度與光信號的強弱有關。在光電耦合器的線性工作區(qū)內(nèi),輸出信號與輸入信號有線性關系。
輸入接口電路工作過程:當開關合上,二極管發(fā)光,然后三極管在光的照射下導通,向內(nèi)部電路輸入信號。當開關斷開,二極管不發(fā)光,三極管不導通。向內(nèi)部電路輸入信號。也就是通過輸入接口電路把外部的開關信號轉化成PLC內(nèi)部所能接受的數(shù)字信號。
(2)輸出接口
PLC的繼電器輸出接口電路
工作過程:當內(nèi)部電路輸出數(shù)字信號1,有電流流過,繼電器線圈有電流,然后常開觸點閉合,提供負載導通的電流和電壓。當內(nèi)部電路輸出數(shù)字信號0,則沒有電流流過,繼電器線圈沒有電流,然后常開觸點斷開,斷開負載的電流或電壓。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使負載動作或不動作。
三種類型:
繼電器輸出:有觸點、壽命短、頻率低、交直流負載
晶體管輸出:無觸點、壽命長、直流負載
晶閘管輸出:無觸點、壽命長、交流負載
本公司主要優(yōu)勢產(chǎn)品:
【美國,英維思 Invensys FOXBORO I\A系統(tǒng), Triconex ESD系統(tǒng)】
【美國AB ..1756系列,1785系列,1746系列,1747系列,1771系列】
【瑞士ABB.. 機器人 DSQC系列,ABB Advant OCS,ABB Procontic PLC CPU】
【法國施耐德140*康昆騰系列處理器,內(nèi)存卡,電源模塊等?!?br />【德國西門子Siemens MOORE,S5,S7,6DD等】
【美國通用電氣GE..IC693/IC697系列】
【美國Westinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、WEStation系統(tǒng)備件】
【德國Bosch Rexroth(博世力士樂):Indramat,I/O模塊,PLC控制器,驅動模
塊等。】
【美國Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列】
備注:歐美進口備件,各品牌停產(chǎn)老備件,我司價格甚優(yōu)!
所詢價格若有別家公司報更低價格,只要您提供公司名稱,我們可以給您進一步的折扣!
: 陳莉萍()
4008555103轉025
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