Siemens Sinumerik 840D sl Function Manual page 31

05.07
Machine
Machines are the lowest administrative unit. Each logical machine represents a
physical CNC machine and functions as a container for NC data and workpieces
that belong to this machine only.
Workpiece
The workpiece administrative unit is used to manage related NC data together. All
of the NC data required for performing an operation on a CNC machine can be
stored in this management unit, for example.
You can also bundle NC data for a workpiece and send it to the CNC machine.
The SINUMERIK* controller itself can manage workpieces, which means that
workpiece-related NC data from DNC can be stored on the controller in the same
form.
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Motion Control Information System DNC (FBDN) - 04/10 Edition
DNC Plant/DNC Cell (FBDN1)
2 Plant structure
FBDN1/2-23