There are many passages dynasty reticle absolute encoder optical encoder, each groove successively with 2-wire, 4-wire, 8-wire, 16 wire ...... choreography, so that in each position encoder by reading each channel scribing through the dark, get a group from the n-1 th power of the unique binary code (Gray code) to 2 2 to the zero power, which is called n-bit absolute encoder. Such encoders are mechanically position the photoelectric encoder of the decision, it is not a power outage, the impact of interference. Rotary absolute encoder to measure the rotation of each channel optical encoder engraved lines to obtain a unique code. Such a code can only be used to rotate 360 degrees within the range of measurement, known as single-turn absolute encoder.
Rotary absolute encoder to measure the rotation of each channel optical encoder engraved lines to obtain a unique code, when rotated more than 360 degrees, the encoding back to square one, which does not comply with the principle of an absolute encoder only. If you want to measure more than 360 degrees of rotation, it is necessary to use multi-turn absolute encoder. Encoder manufacturers use mechanical timepiece gear principle, when the center of the code wheel rotates through another set of code wheel gear (or sets of gear, multiple sets of code disk), single-turn encoder, based on the additional number of turns coding, to expand the measurement range of the encoder, absolute encoder so called multi-turn absolute encoder, it is also determined by the mechanical position encoders, position encoding each unique non-repetition, without memory.
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