The proximity switch has two lines and three lines. The three-wire system has two connections, PNP and NPN, which correspond to the corresponding PLC input points, such as source and sink input points. When wiring, it can be distinguished according to the color of the line. Brown or red is connected to the positive pole of the power supply, blue is connected to the negative pole of the power supply, and black is connected to the input signal.
Proximity switch type
Because the displacement sensor can be made according to different principles and different methods, and different displacement sensors have different "perception" methods for objects, so the common proximity switches are as follows:
1. Eddy current proximity switches, sometimes referred to as inductive proximity switches. It uses a conductive object to create an eddy current inside the object when it approaches the switch that generates an electromagnetic field. This eddy current reacts to the proximity switch, causing the internal circuit parameters of the switch to change, thereby identifying the presence or absence of the conductive object moving closer, thereby controlling the on or off of the switch. The object that this proximity switch can detect must be an electrical conductor.
2. Capacitive proximity switches, which typically measure one plate of a capacitor and the other is the outer casing of the switch. This housing is usually grounded or connected to the housing of the device during the measurement process. When an object moves toward the proximity switch, whether it is a conductor or not, due to its proximity, the dielectric constant of the capacitor is always changed, so that the capacitance changes, so that the state of the circuit connected to the measuring head also occurs. Change, thereby controlling the switch to be turned on or off. The object to be detected by the proximity switch is not limited to a conductor, a liquid or powder that can be insulated, or the like.
3. Hall proximity switch, Hall element is a magnetic sensor. A switch made of a Hall element is called a Hall switch. When the magnetic object moves closer to the Hall switch, the Hall element on the switch detection surface changes the internal circuit state of the switch due to the Hall effect, thereby identifying the presence of a magnetic object nearby, thereby controlling the on or off of the switch. The detection object of such a proximity switch must be a magnetic object.
4. Photoelectric proximity switches, which are made by photoelectric effect, are called photoelectric switches. The illuminating device and the optoelectronic device are mounted in the same detecting head in a certain direction. When a reflective surface (object to be detected) approaches, the optoelectronic device receives the reflected light and outputs it at the signal, thereby "perceiving" that an object is approaching.
5. Pyroelectric proximity switches, which are made of components that sense temperature changes, are called pyroelectric proximity switches. This type of switch is to mount the pyroelectric device on the detecting surface of the switch. When there is an object close to the ambient temperature, the output of the pyroelectric device changes, thereby detecting the proximity of an object.
6. Other types of proximity switches, when the distance of the observer or system to the source changes, the frequency of the approaching wave will shift, a phenomenon known as the Doppler effect.
Proximity switch type
Because the displacement sensor can be made according to different principles and different methods, and different displacement sensors have different "perception" methods for objects, so the common proximity switches are as follows:
1. Eddy current proximity switches, sometimes referred to as inductive proximity switches. It uses a conductive object to create an eddy current inside the object when it approaches the switch that generates an electromagnetic field. This eddy current reacts to the proximity switch, causing the internal circuit parameters of the switch to change, thereby identifying the presence or absence of the conductive object moving closer, thereby controlling the on or off of the switch. The object that this proximity switch can detect must be an electrical conductor.
2. Capacitive proximity switches, which typically measure one plate of a capacitor and the other is the outer casing of the switch. This housing is usually grounded or connected to the housing of the device during the measurement process. When an object moves toward the proximity switch, whether it is a conductor or not, due to its proximity, the dielectric constant of the capacitor is always changed, so that the capacitance changes, so that the state of the circuit connected to the measuring head also occurs. Change, thereby controlling the switch to be turned on or off. The object to be detected by the proximity switch is not limited to a conductor, a liquid or powder that can be insulated, or the like.
3. Hall proximity switch, Hall element is a magnetic sensor. A switch made of a Hall element is called a Hall switch. When the magnetic object moves closer to the Hall switch, the Hall element on the switch detection surface changes the internal circuit state of the switch due to the Hall effect, thereby identifying the presence of a magnetic object nearby, thereby controlling the on or off of the switch. The detection object of such a proximity switch must be a magnetic object.
4. Photoelectric proximity switches, which are made by photoelectric effect, are called photoelectric switches. The illuminating device and the optoelectronic device are mounted in the same detecting head in a certain direction. When a reflective surface (object to be detected) approaches, the optoelectronic device receives the reflected light and outputs it at the signal, thereby "perceiving" that an object is approaching.
5. Pyroelectric proximity switches, which are made of components that sense temperature changes, are called pyroelectric proximity switches. This type of switch is to mount the pyroelectric device on the detecting surface of the switch. When there is an object close to the ambient temperature, the output of the pyroelectric device changes, thereby detecting the proximity of an object.
6. Other types of proximity switches, when the distance of the observer or system to the source changes, the frequency of the approaching wave will shift, a phenomenon known as the Doppler effect.
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