Siemens SINUMERIK 840Di sl - Page 453

A
01/2008 Appendix
B Terms
A
© Siemens AG 2008 All rights reserved.
SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition A-453
coordinated by → synchronization.
Channel structure
The channel structure makes it possible to process the → programs of
individual channels simultaneously and asynchronously.
Contour
Outline of the → workpiece
Contour monitoring
The following error is monitored within a definable tolerance band as a
measure of contour accuracy. Overloading of the drive, for example,
may result in an unacceptably large following error. In such cases, an
alarm is output and the axes are stopped.
Coordinate system
See → Machine coordinate system
→ Workpiece coordinate system
Offset memory
Data range in the control, in which the tool offset data are stored.
K
v
Servo gain factor, a control variable in a control loop.
L
Linear axis
The linear axis is an axis, which, in contrast to a rotary axis, describes
a straight line.
M
Machine
Operating area of the control.
Machine axes
Physically existent axes on the machine tool.
Machine coordinate
system
A coordinate system, which is related to the axes of the machine tool.
Machine zero
A fixed point on the machine tool, which can be referenced by all
(derived) measuring systems.
Machine control panel
An operator panel on a machine tool with operating elements such as
keys, rotary switches, etc., and simple indicators such as LEDs. It is
used to directly influence the machine tool via the PLC.
Dimensions
specification, metric and
inches
Position and pitch values can be programmed in inches in the
machining program. The control is set to a basic system regardless of
the programmable dimensional specification (G70/G71).
MDA
Control operating mode: Manual Data Automatic. In the MDA mode,
individual program blocks or block sequences with no reference to a
main program or subprogram can be input and executed immediately
afterwards through actuation of the NC start key.