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Siemens SINUMERIK 840D Operator's Manual Page 324

Computerized numerical control system for machine tools.
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Auxiliary functions
Axis address
Axis identifier
Axis name
Backlash compensation
Backup battery
Back-up memory
Basic axis
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 can be used to transfer -> parameters to the ->
PLC in -> parts programs, where they trigger reactions which are
defined by the machine manufacturer.
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
See -> axis identifier
Axes are labeled in accordance with DIN 66217 (for a clockwise
orthogonal -> coordinate system) with the letters X,Y, Z.
-> Rotary axes rotating around X, Y, Z are assigned the identifiers A,
B, C. Additional axes, which are parallel to those specified, can be
identified with other letters.
See -> axis identifier
Compensation for mechanical machine backlash, e.g. backlash on
reversal for feed screws. Backlash compensation can be entered
separately for each axis.
Saving the memory contents to an external memory device.
The backup battery ensures that the -> user program is reliably
backed up in the -> CPU against mains failure and that fixed data
areas and markers, times and counters are kept in non-volatile
The backup memory enables buffering of memory areas of the ->
CPU without a buffer battery. Buffering can be performed for a
configurable number of times, counters, markers and databytes.
Axis whose setpoint or actual value position forms the basis of the
calculation of a compensation value.
SINUMERIK 840D/810D Operator's Guide HMI Embedded (BEM) – 03.04 Edition
 Siemens AG, 2004. All rights reserved


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