I. Operating Principle

The operating principle of absolute encoders is based on the detection of holes or lines on an optical code disc by photoelectric sensors. The core component of the encoder is a code disc with specific encoding, which has many tracks of engraved lines or holes arranged according to specific rules (such as 2-line, 4-line, 8-line, etc.). When light passes through or reflects these holes or lines, photoelectric sensors generate corresponding electrical signals. By detecting the state of each hole or line, the signal processing circuit can determine the position of the code disc, thereby determining the position of the object. Each hole or line corresponds to a unique code, and by digitizing these codes, the exact position of the object can be obtained.

II.Why Absolute Encoders Can Store Data During Power Loss

1、Unique Encoding System

Absolute encoders typically use encoding systems such as Gray code or binary code. The characteristic of these encoding systems is that adjacent code values differ by only one bit, ensuring that only one bit changes when the code disc rotates. This feature ensures that each position has a unique code, thus achieving unique identification of the position.

2、Special Code Disc Structure

The code disc of an absolute encoder is designed to have multiple zones, each with unique encoding. This design allows the encoder to directly read the encoding information on the code disc upon re-energizing after a power loss, without the need for a homing operation. Each position has a unique code, so the current position can be accurately determined. The Brighter high-precision absolute encoder uses a new patented technology, with a precision mechanical gear structure inside. As the shaft drives the gear rotation, the internal magnetic-sensitive chip senses changes in the magnetic field to record the rotation angle. With no internal battery, it can also achieve power-loss memory, even if the data changes during the power loss, the data can still be recorded.

3、Function of the Electronic Decoder

The signals detected by the sensor are processed by an electronic decoder. The decoder can interpret changes in Gray code or binary code and convert them into accurate position information. This allows the decoder to determine the current position based on the detected code information, regardless of whether the system is powered on or off, thereby achieving data storage and power-loss memory.

4、Backup and Recovery Mechanism

To further enhance the reliability of data storage, some absolute encoders also employ backup and recovery mechanisms. By adding extra storage units in the encoder, data can be saved and recovered. When the encoder is re-energized after a power loss, it can read data from the backup storage unit, accurately restoring to the position before the power loss.

III.Advantages of Absolute Encoders

High Precision: Absolute encoders use unique encoding methods and detection technologies to provide high-precision position measurement, meeting the needs of various high-precision applications. The Brighter high-precision absolute encoder can achieve a maximum accuracy of 0.05 degrees, accurately identifying angles.

Strong Anti-interference Ability: Absolute encoders employ advanced signal processing circuits that can effectively resist external interference, ensuring the stability and reliability of measurement results. This allows absolute encoders to maintain excellent performance even in harsh environments.

No Need to Find Reference Points: Absolute encoders do not require finding reference points during the measurement process; they only need to read their position at the current location. This greatly simplifies the measurement process and improves measurement efficiency. The Brighter absolute encoder can quickly set the zero point at any position.

Data Preservation During Power Loss: Absolute encoders internally store position information, which remains unchanged even during power loss. This allows absolute encoders to continue working without recalibration after power restoration. Even if the data changes during power loss, the Brighter absolute encoder can still remember the data after the change.

High Safety: Absolute encoders ensure system safety and stability, preventing equipment damage and injuries. In applications that require high security, absolute encoders are an indispensable choice. Brighter products are waterproof, explosion-proof, and have passed certification by national testing institutions.

IV.Wiring Method

The wiring method of absolute encoders is usually complex because the encoder needs to use multi-core cable for signal transmission. When wiring, it is necessary to arrange and bind the corresponding wires according to the encoder and controller manuals to ensure correct connections. In addition to signal lines and power lines, the Brighter absolute encoder also adds function lines and shielding lines. Function lines can quickly set various parameters of the Brighter absolute encoder, such as setting the zero point, restoring factory settings, etc. Shielding lines can maximally reduce external electromagnetic interference to ensure the correct transmission of data.

In the wiring process, the following points need to be noted:

Interface Matching: Ensure that the encoder and controller have matching interface types to avoid using incompatible interfaces.

Cable Connections: Cable connections should be firm and reliable to prevent loosening or damage, which could lead to unstable signal transmission.

Grounding Treatment: The encoder should have reliable grounding treatment to ensure the safe operation of the equipment.

After completing the wiring, electrical testing and debugging are required to ensure the normal operation of the encoder and control system. During the testing process, output signals under different positions and motion speeds can be checked to verify the accuracy and reliability of the encoder. For Brighter absolute encoders with RS485, RS232, CAN communication, we provide free PC software that allows for quick modification of various parameters of the absolute encoder through the PC software on the computer.

In summary, absolute encoders are widely used in the field of industrial automation due to their characteristics of high precision, high reliability, and strong anti-interference ability. During the wiring and use process, it is necessary to strictly follow the instructions to ensure the normal operation of the equipment and measurement accuracy.

For more information or to make a purchase, please visit our official website  https://briterencoder.com/. Choose  BriterEncoder and experience the excellent enjoyment of high-precision measurement!

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