Siemens SINUMERIK 840Di sl Programming Manual page 530

Glossary
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.
C spline
The C-spline is the most well-known and widely used spline. The transitions at the
interpolation points are continuous, both tangentially and in terms of curvature. 3rd order
polynomials are used.
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
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
Compensation table
Table containing interpolation points. It provides the compensation values of the
compensation axis for selected positions on the basic axis.
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Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals