Siemens SINUMERIK 840D sl Function Manual page 956

Glossary
Auxiliary functions
Auxiliary functions enable → part programs to transfer → parameters to the → PLC, which then
trigger reactions 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 feedrate.
Auxiliary axes are not involved in actual machining, e.g. tool feeder, tool magazine.
Axis address
See → Axis name
Axis name
To ensure clear identification, all channel and → machine axes of the control system must be
designated with unique names in the channel and control system. The → geometry axes are
called X, Y, Z. The rotary axes rotating around the geometry axes → are called A, B, C.
Backlash compensation
Compensation for a mechanical machine backlash, e.g. backlash on reversal for ball screws.
Backlash compensation can be entered separately for each axis.
Backup battery
The backup battery ensures that the → user program in the → CPU is stored so that it is safe
from power failure and so that specified data areas and bit memory, timers and counters are
stored retentively.
Basic axis
Axis whose setpoint or actual value position forms the basis of the calculation of a
compensation value.
Basic Coordinate System
Cartesian coordinate system which is mapped by transformation onto the machine coordinate
system.
The programmer uses axis names of the basic coordinate system in the → part program. The
basic coordinate system exists parallel to the → machine coordinate system if no
→ transformation is active. The difference lies in the → axis names.
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Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions