Siemens Sinumerik 840D sl Function Manual page 227

05.07
As with the machine types, the tool setting devices can be connected in a serial
configuration or via the file system (network drive).
Preset data
Preset data is tool data that is downloaded to the tool setting device where it
provides a basis for setting and calibrating the tools. The display field contains the
NC data type for the preset data.
Actual data
Actual data is tool data that is generated on the tool setting device and is uploaded
from here back to the DNC system from where it can be downloaded later to the
relevant machine.
Note
Within a DNC plant, all the tool setting devices must use the same preset value
types and actual value types. They are defined in the DNCMACFG configuration
table.
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Motion Control Information System DNC (FBDN) - 04/10 Edition
DNC Plant/DNC Cell (FBDN1)
10 Configuration
FBDN1/10-219