Siemens Sinumerik 840D sl Function Manual page 264

DNC Plant/DNC Cell (FBDN1)
12 Auto archiving
Auto Compare / Auto Archive checkbox
If only the comparison function is required, activate the Auto Compare checkbox.
If you want to archive NC data on the machine in the DNC system, activate the
Auto Archive checkbox.
Note
Do not activate both the Auto Compare and Auto Archive checkboxes at the
same time because otherwise the comparison will be carried out twice before the
data is archived.
The upload directory is set automatically to Machine when you select Auto
Archive; the search level of the NC data for the machine can be changed as
required.
Special features of the NC data search level
The configured search level is machine specific. It determines the search levels at
which the system searches for NC data for the comparison.
Note
Workpieces are considered only in the machine directory. In the log database
and the log trace file , however, you are informed if a workpiece with the same
name is located within the search level. This prevents "half-finished" workpieces
from being generated in the machine directory, which would then result in
separate versions of the program being created.
The configuration is performed via a combination field. The following search areas
are available:

Machine

Machine, group (search area for machine and higher-level group)
Note
The upload directory must be located within the search level otherwise a new
version of the same program would be created each time data is archived.
FBDN1/12-266
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Motion Control Information System DNC (FBDN) - 04/10 Edition
05.07