Siemens SINUMERIK 840D sl Function Manual page 757

Axis types
Positioning axes can be linear axes and rotary axes.
Positioning axes can also be configured as indexing axes.
Independence of positioning axes and path axes
The mutual independence of path and positioning axes is ensured by the following
measures:
● No shared interpolation
● Each positioning axis has a dedicated axis interpolator
● Dedicated feed override for each positioning axis
● Dedicated programmable feedrate
● Dedicated "axis-specific delete distance-to-go" interface signal.
Dependencies
Positioning axes are dependent in the following respects:
● A shared part program
● Starting of positioning axes only at block boundaries in the part program
● With rapid traverse movement G0 path axes traverse as positioning axes in one of two
● No rapid traverse override
● The following interface signals act on the entire channel and therefore on positioning
● Alarms specific to program and channel also deactivate positioning axes.
● Program control (dry run feed, program test, DRF, ... etc.) also act on positioning axes
● Block search and single block also act on positioning axes.
● The last block with a programmed end-of-motion criterion that was processed in the
● Group 1 (modal movement commands) of the G functions G0, G1, G2, ...) does not apply
References:
Programming Manual, Fundamentals.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
different modes.
axes:
– DB21, ... DBX7.1 (NC start)
– DB21, ... DBX7.3 (NC stop)
– DB21, ... DBX7.7 (reset)
– DB21, ... DBX6.1 (read-in disable)
search run serves as a container for setting all axes.
to positioning axes.
11.2 Own channel, positioning axis or concurrent positioning axis
Positioning Axes (P2)
757