A
03.04 Appendix
B Terms
Approach fixed machine
point
Approach motion towards one of the predefined -> fixed machine
points.
Archiving
Reading out data and/or directories to an external memory device.
A-Spline
The Akima-Spline runs under a continuous tangent through the
programmed interpolation points (3rd order polynomial).
Asynchronous
subroutine
A parts program which can be started asynchronously to
(independently of) the current program status by an interrupt signal
(e.g. "rapid NC input" signal).
Automatic
Operating mode of the control (block sequence operation according to
DIN): Operating Mode in NC systems in which a -> parts program is
selected and continuously executed.
Auxiliary functions
Auxiliary functions can be used to transfer -> parameters to the ->
PLC in -> parts programs, where they trigger reactions which are
defined by the machine manufacturer.
Axes
In accordance with their functional scope, the CNC axes are
subdivided into:
• Axes: interpolating path axes
• Auxiliary axes: non-interpolating feed and positioning axes with an
axis-specific feed rate. Auxiliary axes are not involved in the actual
machining, and include for example tool feeders and tool
magazines.
Axis address
See -> axis identifier
Axis identifier
Axes are labeled in accordance with DIN 66217 (for a clockwise
orthogonal -> coordinate system) with the letters X,Y, Z.
-> Rotary axes which rotate around are labeled with the letters A, B,
C. Additional axes parallel to the above can be identified with further
address letters.
Axis name
See -> axis identifier
B
Backlash compensation
Compensation for mechanical machine backlash, e.g. backlash on
reversal for feed screws. Backlash compensation can be entered
separately for each axis.
Backup
Saving the memory contents to an external memory device.
Siemens AG, 2004. All rights reserved.
SINUMERIK 840D/840Di/810D Operator’s Guide Handheld Terminal 6 (BAH) - 03.04 Edition A-145
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