Check For Presence Of File (Isfile) - Siemens Sinumerik 840D sl Programming Manual

Flexible NC programming

1.21 Check for presence of file (ISFILE)

1.21 Check for presence of file (ISFILE)
Function
The ISFILE command can be used to check whether a file exists in the NCK's static user
memory (passive file system).
Syntax
<result>=ISFILE("<file name>")
Significance
ISFILE:
<file name>:
152
Command for checking if the specified file exists in the passive file
system.
Name of the file whose existence is to be checked in the passive file
system.
Type: STRING
The following points should be noted when specifying the file name:
• The specified file name must not contain any blank spaces or
control characters (characters with ASCII code ≤ 32).
• The file name can be specified with path data and file identifier.
– Path data
Path data must be absolute, i.e. start with "/".
If a path is not specified, the file is searched for in the current
directory (= directory of selected program).
– File identifier
If the file name does not contain a domain identifier ("_N_"), it is
added accordingly.
If the fourth-last character of the file name is an underscore "_",
the next three characters will be interpreted as the file identifier.
In order to be able to use the same file name for all file
commands, e.g. via a STRING type variable, only the _SPF and
_MPF file identifiers may be used.
If there is no "_MPF" or "_SPF" identifier, the file name is
automatically completed with _MPF.
• The file name length can be up to 32 bytes, the path length up to
128 bytes.
Example:
"PROTFILE"
"_N_PROTFILE"
"_N_PROTFILE_MPF"
"/_N_MPF_DIR_/_N_PROTFILE_MPF/"
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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