HEIDENHAIN TNC 320 (340 551-02) - Manual (Page 322)

322 9 Programming: Subprograms and Program Section Repeats
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Calling any program as a subprogram
8 To select the functions for program call, press the
PGM CALL key.
8 Press the PROGRAM soft key.
8 Enter the complete path name of the program you
want to call and confirm your entry with the END key.
You need only enter the program name if the program you
want to call is located in the same directory as the program
you are calling it from.
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 an 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.