Siemens SINUMERIK 840D sl Programming Manual page 667

Variable definition
A variable definition includes the specification of a data type and a variable name. The
variable names can be used to access the value of the variables.
Velocity control
In order to be able to achieve an acceptable traversing velocity on very short traverse
movements within a single block, predictive velocity control can be set over several blocks
(-> look ahead).
Work offset
Specification of a new reference point for a coordinate system through reference to an
existing zero point and a -> frame.
1. Adjustable
2. External
3. Programmable
Working area
Three-dimensional zone into which the tool tip can be moved on account of the physical
design of the machine tool. See -> protection zone.
Working area limitation
With the aid of the working area limitation, the traversing range of the axes can be further
restricted in addition to the limit switches. One value pair per axis may be used to describe
the protected working area.
Working memory
The working area is a RAM area in the -> CPU which is accessed by the processor to
access the user program during program execution.
Workpiece
Part to be created/machined by the machine tool.
Job planning
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
SINUMERIK 840D: A configurable number of adjustable zero offsets is available for each
CNC axis. The offsets which can be selected via G functions are effective on an
alternating basis.
In addition to all the offsets which define the position of the workpiece zero point, an
external zero offset can be overlaid by means of the handwheel (DRF offset) or from the
PLC.
Zero offsets are programmable for all path and positioning axes with the TRANS
command.
Glossary
Glossary-21