Siemens SINUMERIK 840D Operator's Manual page 486

A
Appendix
B Terms
Multipoint interface
N
NC
NCK
Network
Node number
NRK
NURBS
O
Oblique-plane machining
A-486
The multipoint interface (MPI) is a 9-pin sub-D port. A parameterizable
number of devices can be connected to an MPI for the purpose of
communicating with one another:
· Programming devices
· MMI (HMI) systems
· Other automation systems
The "Multipoint Interface MPI" parameter block of the CPU contains
the -> parameters which define the properties of the multipoint
interface.
Numerical Control It incorporates all the components of the machine
tool control system: -> NCK, -> PLC, -> MMC, -> COM.
Note: CNC (computerized numerical control) would be a more
appropriate description for the SINUMERIK 840D control or FM-NC :
computerized numerical control.
Numerical Control Kernel: Component of the NC control which
executes -> parts programs and essentially coordinates the
movements on the machine tool.
A network is the interconnection of several S7-300s and other
terminal devices such as a programming device, for example,
interlinked by means of -> connecting cables. The networked devices
interchange data via the network.
The node number is the "contact address" of a -> CPU or the ->
programming device or another intelligent I/O module if these devices
are exchanging data with one another via a -> network. The node
number is assigned to the CPU or the programming device
by the S7 tool -> "S7 Configuration".
Numeric Robotic Kernel (operating system of the -> NCK)
Motion control and path interpolation are implemented internally in the
control on the basis of NURBS (Non-Uniform Rational B Splines). A
standard procedure is thus available (SINUMERIK 840D) as an
internal control function for all modes of interpolation.
Drilling and milling operations on workpiece surfaces which are
oblique to the coordinate planes of the machine are supported by the
"Oblique surface machining" function.
SINUMERIK 840D/840Di/810D Operator's Guide HMI Advanced (BAD) – 03.04 Edition
A
03.04
Ó Siemens AG, 2004. All rights reserved