Siemens Sinumerik 840D sl Programming Manual page 269

Program code
N10 G1 X... Y... Z... F500
N20 G643
N30 XO Y0
N40 X20 Y0
N50 X20 Y20
N60 X0 Y20
N70 X0 Y0
N100 M30
Example 2:
The following example shows the difference between both types of motion control. Both times
the default setting FGROUP(X,Y,Z) is active.
Program code
N10 G1 X0 A0 F1000 SPATH
N20 POLY PO[X]=(10,10) A10
or:
Program code
N10 G1 X0 F1000 UPATH
N20 POLY PO[X]=(10,10) A10
In block N20, path S of the FGROUP axes is dependent on the square of curve parameter U.
Therefore, different positions are obtained for the synchronous axis A along path X, according
to whether SPATH or UPATH is active.
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
4.6 Settable path reference (SPATH, UPATH)
Comment
; Block-internal corner rounding with G643
; Edge length (mm) for the axes
Special Motion Commands
269