Siemens SINUMERIK 840D sl Function Manual page 768

P2: Positioning axes
11.2 Own channel, positioning axis or concurrent positioning axis
Traverse path axes in G0 as positioning axis
Each path axis can be traversed as positioning axis in rapid traverse movement (G0).
Thus all axes travel to their endpoint independently.
In this way, two sequentially programmed X and Z axes are treated like positioning axes in
conjunction with G0. The block change to axis Z can be initiated by axis X as a function of
the braking ramp time setting (100-0%). Axis Z starts to move while axis X is still in motion.
Both axes approach their end point independently of one another.
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.
768
different modes.
axes:
– DB21, ... DBX7.1 (NC start)
– DB21, ... DBX7.3 (NC stop)
– DB21, ... DBX7.7 (reset)
– DB21, ... DBX6.1 (read-in disable)
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions