Flexible NC programming
1.25 Subprogram technique
Job planning
152 Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
Interrupt routines (ASUB)
If a subprogram is called in the context of an interrupt routine, this will not be executed at the
program level currently active in the channel (n) but at the next lowest program level (n+1).
So that this remains possible even at the lowest program level, 2 additional program levels
(16 and 17) are available in conjunction with interrupt routines.
If more than 2 program levels are required, this has to be taken into account explicitly in the
structuring of the part program executed in the channel. In other words, only a maximum of
as many program levels may be used in order to leave sufficient program levels available for
interrupt processing.
If interrupt processing needs 4 program levels for example, the part program must be
structured so that it uses a maximum of up to program level 13. In the event of an interrupt,
the 4 program levels it requires (14 to 17) will be available to it.
Siemens cycles
Siemens cycles need 3 program levels. Therefore, a Siemens cycle must be called at the
latest in:
● Part program processing: program level 12
● interrupt routine: program level 14
1.25.1.4 Search path
When a subprogram is called without a path being specified, the control will search the
following directories in the sequence indicated:
Sequence Directory Description
1. Current directory Directory containing the calling program
2. /_N_SPF_DIR / Global subprogram directory
3. /_N_CUS_DIR / User cycles
4. /_N_CMA_DIR / Manufacturer cycles
5. /_N_CST_DIR / Standard cycles
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