The distinguish of servo motor absolute encoder and incremental encoder ！

Server drive "absolute encoder" relative to "incremental encoder" is concerned. "Absolute encoder" in some way represents the memory of the object and the absolute position, angle and number of turns. That is, once the position, angle, and a fixed number of laps, showing the value whenever the encoder is uniquely fixed, after including electric power to vote.
"Incremental encoder" can not do this. General "incremental encoder" output of two a, b and a pulse signal z (l) zero signal,A,Bdifference between each pulse phase angle of 90 degrees. Pulse count may know the location, angle and number of turns increment by A,B pulse signal leads or lags can know the direction, power outages, you must start counting again from the base agreement.
"Incremental encoder" indicates the position, angle and number of laps after treatment needs to be done to re-cast power to do "re-zero" operation, the servo drive "incremental encoder" than "absolute encoder" in much cheaper price.

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