HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 170)

170 Programming: Subprograms and program section repeats
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Calling any program as a subprogram
 To select the functions for program call, press the
PGM CALL key
 Press the PROGRAM soft key for the TNC to start the
dialog for defining the program to be called. Use the
screen keyboard to enter the path name (GOTO key),
or
 press the SELECT PROGRAM soft key for the TNC to
display a selection window in which you can select
the program to be called. Confirm with the END key
If the program you want to call is located in the same
directory as the program you are calling it from, then you
only need to enter the program name.
If the called program is not located in the same directory
as the program you are calling it from, you must enter the
complete path, e.g. TNC:\ZW35\SCHRUPP\PGM1.H
If you want to call a DIN/ISO program, enter the file type .I
after the program name.
You can also call a program with Cycle 12 PGM CALL.
As a rule, Q parameters are effective globally with a PGM
CALL.
So please note that changes to Q parameters in the
called program can also influence the calling program.