HEIDENHAIN TNC 620 User Manual page 307

8.2 Subprograms
Operating sequence
1 The TNC executes the part program up to calling a subprogram,
Ln.0.
2 The subprogram is then executed from beginning to end, G98
L0.
3 The TNC then resumes the part program from the block after
the subprogram call Ln.0
Programming notes
A main program can contain any number of subprograms
You can call subprograms in any sequence and as often as
desired
A subprogram cannot call itself
Write subprograms after the block with M2 or M30
If subprograms are located before the block with M2 or M30
in the part program, they will be executed at least once even if
they are not called
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
Subprograms 8.2
307
8