Siemens Sinumerik 840D sl Programming Manual page 210

Flexible NC programming
1.25 Subprogram technique
The "MAIN.MPF" main program is stored in NC memory and is selected for execution.
The "SCHRUPPEN.SPF" or "SCHRUPPEN.MPF" subprogram to subsequently loaded is on
the local drive in the directory "/user/sinumerik/data/prog/WKS.DIR/WST1.WPD".
The subprogram path is preset in SD42700:
SD42700 $SC_EXT_PROG_PATH = "LOCAL_DRIVE:WKS.DIR/WST1.WPD"
Note
Without the path being specified in the SD42700, the EXTCALL instruction for this example
would have to be programmed as follows:
EXTCALL("LOCAL_DRIVE:WKS.DIR/WST1.WPD/SCHRUPPEN")
Further information
EXTCALL call with absolute path name
If the subprogram exists at the specified path, it will be executed following the EXTCALL call.
If it does not exist, program execution is cancelled.
EXTCALL call with relative path name/without path name
In the event of an EXTCALL call with a relative path name or without a path name, the
available program memories are searched as follows:
• If a path name is preset in SD42700 $SC_EXT_PROG_PATH, the data specified in the
EXTCALL call (program name or with relative path name) is searched for first, starting from
this path. The absolute path results from linking the following characters:
-
-
-
• If the called subprogram is not found at the preset path, the data specified in the EXTCALL
call is then searched for in the user-memory directories.
• The search ends when the subprogram is found for the first time. If the search does not
produce any hits, the program is canceled.
210
The path name preset in SD42700
The "/" character as a separator
The subprogram path or identifier programmed in EXTCALL
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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