HEIDENHAIN TNC 310 (286 140) Pilot - Manual (Page 27)

2 7
Subprograms
S = Jump; R = Return jump
Any Program as a Subprogram
1 The calling program 1 runs up to the program call CALL PGM 21.
2 The called program 21 runs through to its end.
3 The calling program 1 resumes.
The called program must not be ended with M2 or M30!