HEIDENHAIN TNC 640 (34059x-04) ISO programming - Manual (Page 249)

Subprograms 8.2
8
TNC 640 | User's Manual for DIN/ISO Programming | 3/2014
249
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 up to 254 subprograms
You can call subprograms in any sequence and as often as
desired
A subprogram cannot call itself
Write subprograms at the end of the main program (behind the
block with M2 or M30)
If subprograms are located before the block with M2 or M30,
they will be executed at least once even if they are not called
Programming a subprogram
To mark the beginning, press the LBL SET key
Enter the subprogram number. If you want to
use a label name, press the
lbl name soft key to
switch to text entry
To mark the end, press the LBL SET key and enter
the label number "0"