HEIDENHAIN TNC 128 (77184x-02) - Manual (Page 179)

Any desired program as subprogram 7.4
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TNC 128 | User's Manual HEIDENHAIN Conversational Programming | 5/2014
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7.4 Any desired program as subprogram
Operating sequence
1 The TNC executes the part program up to the block in which
another program is called with CALL PGM
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
FN 9: IF +0 EQU +0 GOTO LBL 99 jump
function to force a jump over this program section
The called part program must not contain a
CALL PGM call into
the calling part program, otherwise an infinite loop will result