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The X9 Port on the AKD drive is generally used as an encoder input, EEO (encoder emulated output), or not used. However, the AKD also has the feature to use the X9 port as general I/O.

S700 EEO Index Pulse Alignment Based on Feedback Device

The location of the Emulated Encoder Output (EEO) index pulse (marker pulse) is handled differently for absolute type feedback devices and incremental type feedback devices.  For absolute devices, including resolver and Endat/BiSS absolute encoders, the EEO index is located at a fixed absolute position of the motor.  For incremental devices, including AquadB and Sine/Cosine encoders, the EEO index is located at the position at which the motor was sitting when the drive was booted up.