Absolute encoders！

Use absolute encoders when
position data must be retained
after loss of power. Examples
include robotics, lead/ball
screws, overhead cranes, and
rack and pinion applications

As with incremental encoders,
absolute optical rotary encoders
use a rotating disk to interrupt
the light path to a
photodetector, which produces
an output signal. However,
absolute encoders read
uniquely coded tracks to
generate position information.
No two adjacent positions are
alike. Therefore, absolute
encoders do not lose position
data when power is lost. True
position is available as soon as
power is restored.

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