Absolute Encoders！

Absolute encoders typically contain several detectors and slots
on a revolving wheel to provide a unique output binary code
for each shaft position within its range of resolution. Therefore,
the shaft position can be determined absolutely. Moreover, the
correct position is always retained before and after a power
failure. The tracks on the encoder wheel may be arranged to
provide a 0.5 bit maximum error. Absolute encoders come in
single encoders and multi-turn encoders versions.

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