Incremental Versus Absolute Encoders！

 Incremental Encoders

 The graphic below shows the code disk for an incremental encoder. Incremental encoders generate a series of pulses as they move and provide relative values. Incremental encoders provide speed and distance feedback. They are typically simple and inexpensive. Incremental encoders provide relative position information.

Absolute Encoders

 An absolute encoder has a unique digital output for each shaft position that provides true, or absolute, position regardless of power interruptions. The code disk for an absolute encoder uses an absolute track with straight binary, binary coded decimal, or gray code to provide absolute position data. Upon a loss of power, the encoder will provide the correct absolute position when power is restored. Absolute encoders are used for packaging machines, robotics, lead/ball screw, and pick and place applications, to name a few. Gray code provides the most reliable high speed positioning at the lowest cost.

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