Siemens SINUMERIK 840D sl Programming Manual page 917

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.
Base 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 between the two coordinate systems lies in the
→ axis identifiers.
Baud rate
Rate of data transfer (Bit/s).
Blank
Workpiece as it is before it is machined.
Block
"Block" is the term given to any files required for creating and processing programs.
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
Glossary
917