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 other NC program is run from beginning to end.
3 The control then resumes the calling NC program with the
NC block behind 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 an NC program.
The called NC program must not use CALL PGM to call the calling
NC program (an endless loop would ensue).
The called NC program must not contain the miscellaneous
function M2 or M30. If you have defined subprograms with labels
in the called NC program, then you can replace M2 or M30 with
the jump function FN 9: If +0 EQU +0 GOTO LBL 99.
If you want to call an ISO program, enter the file type .I after the
program name.
You can also call an NC program with Cycle 12 PGM CALL.
You can also call any NC program with the Select the cycle
function (SEL CYCLE).
As a rule, Q parameters are effective globally with a PGM CALL.
So please note that changes to Q parameters in the called
NC program can also influence the calling NC program.
While the control is executing the calling NC program,
editing of all called NC programs is disabled.
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Subprograms and program section repeats | Calling an external NC program
HEIDENHAIN | TNC 620 | Klartext Programming User's Manual | 01/2022