Siemens SINUMERIK 840Di Function Manual page 2030

Glossary
DRF
Differential resolver function: NC function that generates an incremental work offset in
conjunction with an electronic handwheel in automatic mode.
Drive
The SINUMERIK 840D control system is digitally connected to the SIMODRIVE 611
converter system over a high-speed digital parallel bus.
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 enables programs, texts, and program blocks to be created, modified, expanded,
moved, and inserted.
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 limit, the control behaves as though it has reached
an endpoint exactly. A block advance of the → part program occurs.
External work offset
Work offset specified by the → PLC.
Fast retraction from contour
When an interrupt occurs, a motion can be initiated via the CNC machining program,
enabling the tool to be quickly retracted from the workpiece contour that is currently being
machined. The retraction angle and the distance retracted can also be assigned. After fast
retraction, an interrupt routine can also be executed (SINUMERIK 840D).
Glossary-6
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0