Absolute Encoders

These instruments contain a material representation which allows a direct read-out of the angular position, because of which these encoders are called Absolute Rotary Encoders. Encoders with a mechanical store (gear, drive) also acquire the amount or absolute revolutions.

Absolute encoders produce a specifically coded value for each shaft position. Absolute encoders assume the task of counting from coupling devices, especially with regard to positioning functions, so that extensive and costly input modules can be eliminated. In addition, reference speeds are eliminated with the activation of the machine or after the loss of supply voltage, since the current position information is immediately available.

Absolute encoders come in two varients:

• Magnetic
• Optical