Programming a negative software limit switch

Negative software limit switch

The G98 command sets negative SLS in the programmed axes.

• If G90 is active, the negative SLS is set absolute to the programmed value.
• If G91 is active, the programmed value is added relative to P-AXIS-00177.

G98 is active in each block; the software limit switches programmed using it are active cross-block.

Notice

The positions for negative SLS programmed via G98 are stored in the axis-specific variables V.A. SWE.X, V.A. SWE.Y, V.A. SWE.Z, etc. [PROG].

The variables are pre-assigned the value of P-AXIS-00177 of each axis at a reset, mode change or axis change.

Programing Example

Negative software limit switch

(Example 1 – absolute)

%swe_abs.nc
N110 G00 X0  Y0  G90
N120 G00 X20 Y30

(Sets neg. SLS in X to -100 and Y to -200)

N130 G98 X-100 Y-200

( .... )

(Example 2 – relative)

%swe_rel.nc
N110 G00  X0 Y0  G90
N120 G00 X20 Y30

(Offsets neg. SLS in X by 10 and Y by 20)

N130 G98  G91 X10 Y20

( .... )

Warnings, errors and reactions

• Warning P-ERR-21648: The controller uses G98 to calculate a position for the negative SLS that is smaller than the position defined by P-AXIS-00177.

• Error message P-ERR-21649: The controller uses G98 to calculate a position for the negative SLS that is equal to or greater than the position defined by P-AXIS-00178.

• Error message P-ERR-70022: The current actual position of the axis with G98 is smaller than the new negative SLS.