HEIDENHAIN iTNC 530 (340 49x-03) Pilot - Manual (Page 43)

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Program as subprogram
1 The calling program A runs up to the program call CALL PGM B.
2 The called program B runs through to its end.
3 The calling program A resumes.
The called program must not end with M2 or M30.
0 BEGIN PGM A
CALL PGM B
END PGM A
0 BEGIN PGM B
END PGM B