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1747-L514 1747-L514 A-B 好價格

1747-L514 1747-L514 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光二極度管和光電三極管組成。 
發光二級管：在光電耦合器的輸入端加上變化的電信號，發光二極管就產生與輸入信號變化規律相同的光信號。 
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內，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，二極管發光，然后三極管在光的照射下導通，向內部電路輸入信號。當開關斷開，二極管不發光，三極管不導通。向內部電路輸入信號。也就是通過輸入接口電路把外部的開關信號轉化成PLC內部所能接受的數字信號。 
（2）輸出接口 
PLC的繼電器輸出接口電路 
工作過程：當內部電路輸出數字信號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。當內部電路輸出數字信號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部的數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 

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