Answer / prabhakar jadhav

Absolute encoder - not required to recover it's home
condition whenever power OFF.

Incremental encoder - it required to recover home condition
whenever power OFF.

Answer / m.manivannan

Think of an incremental encoder as serial, and absolote as
parallel.
Think of incremental, YOU have to figure out where the
encoder is, and absolute IT tells you where it is.
Incremental after a power failure, you no longer now where
it is, absolute after a power failure still knows where it is.

Incrementals give you a pulse train indicating units of
movement and direction. An absolute gives you a binary bit
signal scaled in bits of resolution for one encoder shaft turn.

With an incremental encoder, you will always need a home
position sensor.

Most applications I have seen incremntals on linear motion
to move an axis, and absolute on a master gear of a machine
to indicate where in the in the rotation of 360 degrees the
machine is at.

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