Operating Sequence; Programming Notes - HEIDENHAIN TNC 620 User Manual

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Operating sequence

1 The control executes the NC program up to the block in which
another NC program is called with CALL PGM.
2 Then the control executes the called NC program up to the end
of program
3 The control then resumes executing the calling NC program
with the block after the program call
If you want to program variable program calls in
connection with string parameters, use the SEL PGM
function.

Programming notes

The control does not require any labels to call any part program
The called NC program must not contain any CALL PGM call into
the calling NC program (an endless loop ensues)
The called NC program must not contain the miscellaneous
functions M2 or M30. If you have defined subprograms with
labels in the called NC program, you can then replace M2 or
M30 with the FN 9: If +0 EQU +0 GOTO LBL 99 jump function
If the called NC program contains the miscellaneous functions
M2 or M30, then the control displays a warning. The control
automatically clears the warning as soon as you select another NC
program.
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Subprograms and Program Section Repeats | Any desired NC program as subprogram
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2017