The disadvantage of the incremental encoder is that there may be technical errors due to noise or other interference. If the machine stops due to power outage or tool damage, the correct position of the actuator before the accident can no longer be found after the accident is eliminated.https://cnc-machining.org/
Absolute encoders use patterns on their discs to express values. Since the four code channels produce 4-bit binary numbers, one cycle of the code channel produces 0000~1111 16-bit binary numbers, so the code channels are divided into sixteen equal parts. When the encoder disc rotates, the four brushes output sixteen binary codes 0000~1111 at a time. https://titanium-machining.com/The encoding value represents the actual angular displacement. The resolution of the encoder disc is related to the number of code channels. With n-bit code channels, the angular resolution is 360 four codes. The main disadvantage of the binary encoder with a resolution of 36022.5 is that the pattern changes irregularly. In use, multiple bits change at the same time, which is easy to cause more misunderstandings.https://beryllium-copper.com/
The improved structure of the Gray code disk, its characteristic is that there is only one binary code between each adjacent decimal number. Therefore, the switching of the group is only performed by one digit, so the misreading can be controlled in one number. Within, the reliability is improved.https://china-turning.com/
The advantages of the Gray code disk are: the coordinate value can be directly read from the absolute code disk, and there will be no miscounts in the accumulation process; the running speed can be improved, and the encoder itself has a mechanical storage function, even if due to power failure or other reasons It causes the coordinate value to be cleared. https://cncoperating.com/After power on, the original absolute coordinate position can still be found. The disadvantage is: when the feed revolution is greater than one revolution, special treatment is required, such as connecting two or more encoders with a reduction gear to form Multi-level detection device, but its structure is complicated and the cost is high