This parameter is the limiting angle, and is measured between the surface and the XY plane of the procedure UCS.

Max. Down
Angle

Even when the cutter is set to move Up only, the cutter may also move down, as long as it is moving below a specified angle.

Max. Up
Angle

Same as above, when the cutter is set to move Down only.

Some functionality may be dependent on the product package. Contact your Reseller if you require a license.