# HSC deselection when a deviation is equal to zero (P-CHAN-00241)

P-CHAN-00241 | Deselect HSC if a deviation is equal to zero (B Spline)
Description | If one of the PATH_DEV or TRACK_DEV tolerances is programmed with 0 for HSC machining in BSPLINE mode, no contour with tolerance 0 (i.e. the programmed contour) occurs. Instead there is a distorted contour with any number of large deviations.

Therefore, meaningful combinations are only either both deviations != 0 or both deviations = 0. An error message is generated if only one of the two deviations is 0. To achieve this response, P-CHAN-00241 = 1 must be set.

Parameter | hsc.bspline.no_hsc_for_deviation_zero
Data type | BOOLEAN
Data range | 0/1
Dimension | ----
Default value | 0
Remarks | Parameterisation example: hsc.bspline.no_hsc_for_deviation_zero 1 .... configures the following response:
PATH_DEV | TRACK_DEV |
>0 | >0 | Monitor deviation of main and tracked axes
0 | 0 | Implicit deselection of HSC machining (#HSC OFF)
>0 | 0 | Error message 21682
0 | >0 | Error message 21682