Siemens SINUMERIK 840D sl Programming Manual page 557

Examples:
● External program memory:
– //Drive1:
– //Drive_1:
– //Drive 1:
– //A B:
– //1 B C 2:
Directory path
The following rules govern the specification of the directory path:
● A "/" is located at the start and end of the directory path and as separator for the individual
path sections.
Note
A double slash ("//") within the directory path is not permitted!
● Directory names:
– Directory names must begin with a letter or a digit. Only for addressing in the NC notation
– The following characters can be any combination of letters, digits and "_".
– Other special characters are not permitted.
● Directory extensions:
– Directory extensions must consist of three letters/digits.
– They are separated with "_" (NC notation) or "." (EES notation) from the directory name.
Note
The passive file system has only the directory extensions _DIR and _WPD.
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
do directory names begin with the domain identification "_N_".
Note
Spaces in directory names are also permitted for external program memories. This is not
true, however, when the external program memory is created as global part program
memory (GDIR).
Work preparation
3.4 File and Program Management
557