Absolute Rotary Encoders

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Absolute rotary encoders translate rotary motion to a unique binary output code which is in parallel to the mechanical movement of a rotating shaft providing accurate positional feedback.

Absolute rotary encoders maintain positional values on the loss of power. The synchronisation of new positional values resume on power restoration, so unlike incremental encoders, there is no need to reset the encoder or other electrical devices on restart.

The most popular type of encoder is an optical rotary encoder. As an encoder shaft turns a disk with multiple tracks, one graduated track for each binary bit also rotates. An infrared light beam reads the bit track on the encoder disk, a binary code which is relative to the angular position of the shaft is generated.

There are two absolute rotary encoder types:

  • Single-turn encoders repeat the binary output code for each revolution, restricting their use to a 360° cycle, used for speed or angular positioning.
  • Multi-turn encoders, due to their mechanical design, offer a unique binary code over many revolutions and generally used for measuring applications.

We offer a vast range of absolute encoders from light-duty to extreme heavy-duty with fieldbus interfaces such as Profibus, Interbus, CANopen, CANlayer2, DeviceNet, EtherCAT, PROFINET, SUCOnet, BiSS, SSI and parallel wired.

Absolute rotary encoders are available with high resolutions, IP and temperature ratings for applications that demand the very best encoder technology.