HEIDENHAIN TNC 640 (34059x-05) ISO programming - Manual (Page 280)

Programming: Subprograms and program section repeats
8.4 Any desired program as subprogram
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TNC 640 | User's ManualDIN/ISO Programming | 1/2015
Operating sequence
1 The TNC executes the part program up to the block in which
another program is called with %
2 Then the other part program is run from beginning to end
3 The TNC then resumes the first part program (i.e. the calling
program) with the block after the program call
Programming notes
The TNC does not need any labels to call any part program
The called program must not contain the miscellaneous
functions
M2 or M30. If you have defined subprograms with
labels in the called part program, you then need to replace M2
or M30 with the
D09 P01 +0 P02 +0 P03 99 jump function to
force a jump over this program section
The called part program must not contain a
% call into the calling
part program, otherwise an infinite loop will result