Siemens SINUMERIK 840D sl Programming Manual page 659

The parameter block "Multipoint Interface MPI" of the CPU contains the -> parameters which
define the properties of the multipoint interface.
Name of identifier
The words according to DIN 66025 are supplemented by the identifiers (names) for variables
(computer variable, system variable, user variable), for subroutines, for keywords and words
with several address letters. In terms of the block format, these supplements have the same
significance as the words. Identifiers must be unique. The same identifier must not be used
for different objects.
NC
Numerical Control: NC control incorporates all the components of the of the machine tool
control system: -> NCK, -> PLC, HMI, -> COM.
Note
CNC (Computerized Numerical Control) is a more accurate term for the SINUMERIK 840D
controls. MARS and Merkur controls.
NCK
Numerical Control Kernel: Component of the NC control which executes -> parts programs
and essentially coordinates the movements on the machine tool.
NRK
Numeric Robotic Kernel (operating system of the -> NCK)
NURBS
Internal motion control and path interpolation are performed using NURBS (non-uniform
rational B-splines). This provides a uniform internal method for all interpolations in the control
(SINUMERIK 840D).
OEM
For machine manufacturers who manufacture their own user interface or wish to integrate
their own technology-specific functions in the control, free space has been left for individual
solutions (OEM applications) for SINUMERIK 840D.
Offset memory
Data range in the control in which the tool offset data are stored.
Job planning
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
Glossary
Glossary-13