A
03.04 Appendix
B Terms
Ó Siemens AG, 2004. All rights reserved
SINUMERIK 840D/840Di/810D Operator’s Guide HMI Advanced (BAD) – 03.04 Edition A-477
Booting
Loading the system program after Power ON.
Bus connector
A bus connector is an S7-300 accessory that is supplied with the ->
I/O modules. The bus connector extends the -> S7-300 bus from the
-> CPU or an I/O module to the next adjacent I/O module.
C
C axis
Axis about which the tool spindle describes a controlled rotational and
positioning movement.
C spline
The C spline is the best known and the most widely used spline. The
spline passes through each of the interpolation points at a tangent
and along the axis of curvature. 3rd-degree polynomials are used.
Channel
A channel is characterized by the fact that it can process a -> parts
program independent of other channels. A channel exclusively
controls the axes and spindles assigned to it. Parts program
sequences of different channels can be coordinated through ->
synchronization.
Channel structure
The channel structure makes it possible to process the -> programs of
individual channels simultaneously and asynchronously.
Circular interpolation
The -> tool is required to travel in a circle between defined points on
the contour at a specified feed while machining the workpiece.
CNC
-> NC
CNC high-level language
The high-level language offers: -> user variables, -> predefined user
variables, -> system variables, -> indirect programming, -> arithmetic
and angular functions, -> relational and logic operations, -> program
jumps and branches, -> program coordination (SINUMERIK 840D),
-> macros.
CNC programming
language
The CNC programming language is based on DIN 66025 with high-
level language expansions. The -> CNC programming language and
-> high-level language expansions support the definition of macros
(sequenced statements).
COM
Numerical control component for the implementation and coordination
of communication.
Compensation axis
Axis having a setpoint or actual value modified by the compensation
value.
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