How does radio frequency identification (RFID) work

With the development of the Internet of Things, radio frequency identification (RFID) technology is increasingly being applied to industrial sites. Today in this article, we will talk to you about the working principle of RFID, and briefly introduce the related products of SICK.

Encoder|Transmitter|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

The full English name of RFID is "RadioFrequency IDentification", and the Chinese translation is "Radio Frequency Identification". It is a wireless identification technology that was born in the 1950s. It can use radio to perform identification without contact. According to different radio frequencies, RFID systems can be divided into four types: low frequency, high frequency, ultra high frequency and microwave. Low frequency system (LF): RFID radio wave frequency is lower than 134KHz system, follow ISO/IEC 18000-2 standard; High frequency system (HF): RFID radio wave frequency in 13.56MHz system, follow ISO/IEC 15693 (compatible with ISO /IEC 18000-3), ISO14443 standard; Ultra-high frequency system (UF): RFID radio wave frequency between 860~960MHz system, following ISO/IEC 18000-6B/C standard; Microwave system (Microwave): RFID radio A system with a wave frequency of 2.4GHz follows the ISO/IEC 18000-4 standard; an RFID system generally consists of four parts: electronic tags, antennas, readers and application software. The electronic label is similar to the bar code in the bar code system, which integrates an erasable chip to store information. According to whether it has a battery, electronic tags are divided into active and passive. Active electronic tags are equipped with batteries, and compared with passive electronic tags, the readable distance is longer; antenna: generally connected to the reader, used to receive/send electromagnetic waves; reader: used to read electronic tags The data is sent to the upper computer application software system; some can also write data to the electronic label;

Application software: PC or PLC based software system, used to process the reader send Incoming data; the RFID system is shown in the figure below:

Encoder|Transmitter|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

The working principle of the RFID system is as follows:

The reader sends electromagnetic waves of a certain frequency through its antenna; when the electronic tag enters the working range of the transmitting antenna, it generates an induced current inside and is activated, so the stored information is sent out through the internal antenna; The antenna receives the carrier signal from the electronic tag and transmits it to the reader; the reader demodulates and decodes the received signal, and sends the processed data to the host computer or PLC processing system.

The picture below is the appearance of the RFU63x RFID reader produced by SICK:

Encoder|Transmitter|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

Its operating frequency is 860 MHz ~ 960 MHz, which belongs to the UHF RFID system. Built-in days Cable, and there are three interfaces for external antennas. It supports communication protocols such as TCP/IP, PROFINET, PROFIBUS, CAN, serial port (RS232\485), and has 4 digital inputs and 4 digital outputs, and its functions can be configured through software. Ok, let’s stop here for radio frequency identification (RFID).