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In many manufacturing and production processes, in mobile machines and in the area of renewable energies encoders have become established as reliable instruments to ensure precise positioning. They convert rotary movement into digital signals. Encoders use the wear-free photoelectric or magnetic detection. A pulse disc firmly attached to the shaft or a movable magnet carrier ensures this detection.

Incremental encoders
Incremental encoders generate a precisely defined number of pulses per revolution. They are a measure of the angular or linear distance moved. The phase difference between the signals A and B, which are shifted by 90 degrees, allows evaluation of the direction of rotation.

Absolute encoders
Absolute encoders provide an absolute numerical value for each angular position even over several revolutions. Even in the event of a power failure the present position is quickly and reliably detected.

Singleturn and multiturn
There are two versions of absolute encoders. Singleturn encoders divide a mechanical revolution into a certain number of measuring steps. The measuring values are repeated after one complete revolution. The maximum resolution of the singleturn encoder is 8192. Multiturn encoders, however, do not only detect absolute angular positions but also count revolutions (up to 4096). The signals are output via an SSI interface or a bus system such as CAN or Profibus.