Siemens SINUMERIK 840D sl Function Manual page 676

K2: Axis Types, Coordinate Systems, Frames
10.2 Axes
Figure 10-5 Axis configuration
Special features
● Leading zeros for user-defined axis names are ignored:
MD10000 `$MN_AXCONF_MACHAX_NAME_TAB[0] = X01 corresponds to X1
● The geometry axes must be assigned to the channel axes in ascending order without any
gaps.
● All channel axes that are not geometry axes are special axes.
Channel axis gaps
Normally, each channel axis defined in machine data MD20080
$MC_AXCONF_CHANAX_NAME_TAB must be assigned a machine axis.
In order to simplify commissioning series of machines with a different number of machine axes,
channel axes may also be defined, which are not assigned to any machine axis. As a result,
gaps can occur in the numbering sequence of the channel axes.
Any channel axis gaps must be explicitly enabled:
MD11640 $MN_ENABLE_CHAN_AX_GAP = 1
Without being enabled, a value of 0 in machine data:
MD20070 $MC_AXCONF_MACHAX_USED
ends the assignment of possibly existing additional machine axes to channel axes.
References:
Function Manual, Extended Functions; Several Operator Panels on Multiple NCUs, Distributed
Systems (B3)
Note
Channel axes without assigned machine axes (channel axis gaps) are, regarding the number
and indexing of the channel axes, treated just like normal channel axes with associated
machine axes.
If a channel axis without assigned machine axis (channel axis gap) is defined as geometry
axis, then this is rejected without an alarm.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions