Siemens SINUMERIK 840D sl Programming Manual page 921

DRF
Differential Resolver Function: NC function which generates an incremental zero offset in
Automatic mode in conjunction with an electronic handwheel.
Drive
The drive is the unit of the CNC that performs the speed and torque control based on the
settings of the NC.
Dynamic feedforward control
Inaccuracies in the → contour due to following errors can be practically eliminated using
dynamic, acceleration-dependent feedforward control. This results in excellent machining
accuracy even at high → path velocities. Feedforward control can be selected and
deselected on an axis-specific basis via the → part program.
Editor
The editor makes it possible to create, edit, extend, join, and import programs/texts/program
blocks.
Exact stop
When an exact stop statement is programmed, the position specified in a block is
approached exactly and, if necessary, very slowly. To reduce the approach time, → exact
stop limits are defined for rapid traverse and feed.
Exact stop limit
When all path axes reach their exact stop limits, the control responds as if it had reached its
precise destination point. A block advance of the → part program occurs.
External zero offset
Zero offset specified by the → PLC.
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
Glossary
921