Cause : Axis assignment of roll feed incorrect comes when the NC block contains an axis number which is defined as a roll feed axis but the axis type is defined as an incremental or absolute position encoder.

1. Axis type 1 or 2:The block is not allowed to contain an axis number which is defined as a roll feed (M7 only).
2. Axis type 3:The axis number of the roll feed must be specified in every NC block.