Siemens SINUMERIK 840DE Programming Manual page 480

Glossary
B-spline
With the B-Spline, the programmed positions are not interpolation points, as they are just
"control points" instead. The generated curve only runs near to the control points, not directly
through them (optional 1st, 2nd or 3rd order polynomials).
Bus connector
A bus connector is an S7-300 accessory part, which is supplied together with the -> I/O
modules. The bus connector expands the -> S7-300 bus from the -> CPU or an I/O module
to the neighboring I/O module.
C axis
Axis, around which the tool spindle describes a controlled rotational and positioning
movement.
Channel
A channel is characterized by its ability to execute a -> parts program independently of other
channels. A channel exclusively controls the axes and spindles assigned to it. Parts
programs run on various channels can be coordinated by -> synchronization.
Channel structure
The channel structure enables the -> programs of the individual channels to be executed
simultaneously and asynchronously.
Circular interpolation
The -> tool is required to travel in a circle between defined points on the contour at a
specified feedrate while machining the workpiece.
CNC
See -> NC.
CNC programming language
The CNC programming language is based on DIN 66025 with high-level expansions. The ->
high-level CNC language and programming allow, among other things, macros to be defined
(groupings of individual instructions).
COM
Component of the NC control for the implementation and coordination of communication.
Compensation axis
Axis with a setpoint or actual value modified by the compensation value
Glossary-4
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals