Siemens SINUMERIK 840D sl Commissioning Manual page 226

Communication between the NC and the drive
7.6 Configuring machine axes
Axis assignment
The assignment of geometry axes to channel axes and channel axes to machine axes, as well
as the definition of the names of the different axis types is realized via machine data. The
following diagram illustrates this relationship:
Figure 7-4 Axis assignment
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CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA