HEIDENHAIN TNC 620 (73498x-01) ISO programming - Manual (Page 204)

204 Programming: Subprograms and program section repeats
7.
6 Pr
ogr
amming examples
N80 G98 L1 * Set label for program section repeat
N90 G91 Z-4 * Infeed depth in incremental values (in space)
N100 G11 G41 G90 R+45 H+180 F250 * First contour point
N110 G26 R5 * Contour approach
N120 H+120 *
N130 H+60 *
N140 H+0 *
N150 H-60 *
N160 H-120 *
N170 H+180 *
N180 G27 R5 F500 * Contour departure
N190 G40 R+60 H+180 F1000 * Retract tool
N200 L1,4 * Return jump to label 1; section is repeated a total of 4 times
N200 G00 Z+250 M2 * Retract in the tool axis, end program
N99999999 %PGMREP G71 *