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      網址:www.www.freeunlimitedebooks.com  2019-07-20  作者:admin    閱讀:

      Photoelectric switch: It uses the occlusion or reflection of the detected object to the light beam, and the circuit is connected by the synchronous circuit to detect the presence or absence of the object. Objects are not limited to metals, and all objects that reflect (or block) light can be detected. Photoelectric switch has diffuse reflection type, counter-radiation type and so on, diffuse reflection only needs one sensor to complete the transmission and reception, while the counter-radiation type needs two sensors, one transmitter and one receiver.
      Photoelectric switches also have NPN and PNP models, but in addition, photoelectric switches also have dry nodes, that is, they can be connected to any kind of PLC.


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