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Siemens SINUMERIK 840D Operator's Manual Page 325

Computerized numerical control system for machine tools.
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Basic coordinate system
Baud rate
Block search
Bus connector
C axis
Channel structure
Circle interpolation
 Siemens AG, 2004. All rights reserved
SINUMERIK 840D/810D Operator's Guide HMI Embedded (BEM) – 03.04 Edition
Cartesian coordinate system which is mapped by transformation onto
the machine coordinate system.
In the -> parts program, the programmer uses the axis names of the
basic coordinate system. The basic coordinate system exists in
parallel to the -> machine coordinate system when no ->
transformation is active. The difference between the systems relates
to the axis identifiers.
Rate of data transfer (Bit/s).
Workpiece as it is before a part is machined.
"Block" is the term given to any files required for creating and
processing programs.
For testing part programs or following interruption of machining, it is
possible to select any point in the part program using the block search
function in order to start or resume at this point.
Loading the system program after power on.
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).
A bus connector is an S7-300 accessory that is supplied 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.
Axis around which the tool spindle describes a controlled rotational
and positioning movement.
A channel is characterized by being able to run independently of other
channels or a part program. A channel exclusively controls the axes
and spindles assigned to it. Parts programs run on various channels
can be coordinated by -> synchronization.
The channel structure enables the -> programs of the individual
channels to be executed simultaneously and asynchronously.
The -> tool is required to travel in a circle between defined points on
the contour at a specified feedrate while machining the workpiece.


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