plc analog io modules in particular often photoelectric sensor controller

① long distance detection reservations on the radio if the detection distance of more than 10m , etc., will be able to implement other detection methods ( magnetic , ultrasonic , etc. ) can not be away from the test. Achieve long- distance
 ② Due to restrictions on the detection  plc controller suppliers of objects to detect object shading and reflection caused by the detection principle , it is not like the proximity sensor will detect metal objects is limited , it can be almost any object glass plastic timber . Liquids for testing.
③ short response time for the speed of light itself , and the sensor circuit constituted by the electronic parts , it does not contain mechanical working time , the response time is very short.
④ resolution through advanced design technology to intelligent plc  cast light beam focused in a small spot , or by forming a special light-receiving optical system to achieve high resolution . Detecting small objects can be detected and the position detection precision can be achieved in non-contact ⑤
Without mechanical contact can detect objects realize detection, and therefore will not cause damage to detect objects and sensors. Therefore , long-term use sensor . ⑥ color discrimination can be achieved
 Reflectivity and absorption of light by detecting Nanda programmable controller objects formed in accordance with the color of the light wavelength of light being cast and testing combinations of objects vary . Using this nature , the object can be detected color detection ⑦ easy to adjust
In visible light projection type , cast light beam is visible to the eye , easy to adjust the position of the object detected .