HEIDENHAIN IK 5394-3D - Manual (Page 260)

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Chapter 3 Probes
Port position offset:
the offset distance along the axis of the rack between the center of the docking
module and the center of the probe tip used for calibration.
Enter port position offsets in the QC-5000 as follows:
If the rack orientation is X Positive: Enter the X value
If the rack orientation is X Negative: Enter the negative of the X value
If the rack orientation is Y Positive Enter the Y value
If the rack orientation is Y Negative Enter the negative of the Y value