HEIDENHAIN TNC 620 (73498x-01) - Manual (Page 228)

228 Programming: Subprograms and program section repeats
7.
5 Nesting
Repeating a subprogram
Example NC blocks
Program execution
1 Main program UPGREP is executed up to block 11.
2 Subprogram 2 is called and executed.
3 Program section between block 10 and block 12 is repeated twice.
Subprogram 2 is repeated twice.
4 Main program SPGREP is executed from block 13 to block 19. End
of program.
0 BEGIN PGM SUBPGREP MM
...
10 LBL 1 Beginning of program section repeat 1
11 CALL LBL 2 Subprogram call
12 CALL LBL 1 REP 2 The program section between LBL 1 and this block
... (block 10) is repeated twice
19 L Z+100 R0 FMAX M2 Last block of the main program with M2
20 LBL 2 Beginning of subprogram
...
28 LBL 0 End of subprogram
29 END PGM SUBPGREP MM