A
Appendix 01/2008
B Terms
© Siemens AG 2008 All rights reserved.
A-452 SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition
Geometry
Description of a → workpiece in the → workpiece coordinate system.
Geometry axis
Geometry axes are used to describe a 2- or 3-dimensional range in
the workpiece coordinate system.
Velocity control
In order to achieve an acceptable traverse rate on very short traverse
movements, predictive evaluation over several blocks ( Look Ahead)
can be set.
Linear interpolation
The tool travels along a straight line to the destination point while
machining the workpiece.
Global main
program/subprogram
Each global main program/subprogram may appear only once under
its name in the directory. It is not possible to use the same program
name in different directories with different contents as a global
program.
H
Main program
Part program identified by a number or name, in which other main
programs, subprograms or → cycles may be called.
Auxiliary functions
Auxiliary functions can be used to transfer → parameters to the →
PLC in → part programs, where they trigger reactions, which are
defined by the machine manufacturer.
I
Interpolator
Logical unit of the → NCK, which determines intermediate values for
the movements to be traversed on the individual axes, on the basis of
destination positions specified in the part program.
J
Jog
Control operating mode (setup operation): In JOG mode, it is possible
to set up the machine. Individual axes and spindles can be traversed
in JOG mode by means of the direction keys. Other functions
available in JOG mode are → reference point approach, →
repositioning and → preset (setting an actual value).
K
Channel
A channel can execute a → part program independently of the other
channels. A channel exclusively controls the axes and spindles
assigned to it. Part programs runs of various channels can be
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