So even if power is lost, an absolute encoder will know the exact position of the shaft or the linear drive. Absolute encoders, on the other hand, keep track of absolute position, whether rotation of a shaft or linear travel, by assigning a unique digital value to each position. When power is interrupted, incremental encoders lose their position reference and must start over via a re-homing sequence to a reference point. ![]() ![]() An incremental encoder measures change in position, but does not keep track of actual position. For both types of encoder, the position measurement can be either incremental or absolute. Rotary encoders measure rotation of a shaft, while linear encoders measure distance traveled. ![]() An encoder is a device that measures position, and in some configurations, can also measure direction.
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