Search Path - Siemens SINUMERIK 840D sl Programming Manual

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Table of Contents

Division of program levels:

● Program level 0: Main program level

● Program level 1 to 15: Subprogram level 1 to 15

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

● Part program processing: program level 12

● interrupt routine: program level 14

Search path

When a subprogram is called without a path being specified, the control will search the

following directories in the sequence indicated:

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Programming Manual, 03/2013, 6FC5398-2BP40-3BA1

Sinumerik 828d Sinumerik 840de sl