Absolute encoder

An absolute encoder generates information about the position, angle, and number of revolutions in type-specific angular increments. Based on the resolution, each code pattern forms a unique reference that is determined with each revolution using the code disc. There is no need for a reference run after power is applied. A singleturn encoder measures the absolute rotation within a single revolution, whereas a multiturn encoder additionally provides the number of revolutions.

More information from SICK

Absolute encoders