Absolute Encoder

An Absolute Encoder is an encoder that provides a unique output for each resolvable position even after a power cycle. Unlike incremental encoders which provide an output designated in cycles per revolution (CPR), absolute encoders are called out in bits. For example, a 12-bit (2¹²) rotary encoder has 4096 resolvable positions in 360 degrees of rotation. US Digital employs both optical and magnetic technologies in their absolute encoders. US Digital’s optical absolute encoders are field programmable from 2 to 4096 codes per revolution. Absolute encoders can be single turn or multi-turn—keeping track not only the position of the shaft but also the number of rotations of the shaft.