Siemens SINUMERIK 840DE Programming Manual page 478

Glossary
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.
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.
Backlash compensation
Compensation for mechanical machine backlash, e.g., backlash on reversal for feed screws.
Backlash compensation can be entered separately for each axis.
Glossary-2
Auxiliary axes are not involved in the actual machining and include, for example, tool
feeders and tool magazines.
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals