Siemens SINUMERIK 840D sl Function Manual page 960

Glossary
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 work offset
Work offset specified by the → PLC.
Fast retraction from the 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 parameterized. An interrupt routine
can also be executed following the fast retraction.
Feed override
The programmed velocity is overriden by the current velocity setting made via the → machine
control panel or from the → PLC (0 to 200%). The feedrate can also be corrected by a
programmable percentage factor (1 to 200%) in the machining program.
Finished-part contour
Contour of the finished workpiece. See → Raw part.
Fixed machine point
Point that is uniquely defined by the machine tool, e.g. machine reference point.
960
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions