Siemens SINUMERIK 840D sl Function Manual page 511

Figure 7-13
The configurations highlighted in the figure above apply when TRACYL is active.
Assignment of names to geometry axes
According to the above axis configuration overview, the geometry axes to be involved in the
TRACYL operation must be defined with:
MD20050 $MC_AXCONF_GEOAX_NAME_TAB[0]="X"
MD20050 $MC_AXCONF_GEOAX_NAME_TAB[1]="Y"
MD20050 $MC_AXCONF_GEOAX_NAME_TAB[2]="Z",
for example, (the choice of names in the above figure is in accordance with defaults).
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Axis configuration for the example in Figure "Machining grooves on a cylinder surface
with X-Y-Z-C kinematics"
Kinematic Transformation (M1)
7.3 TRACYL
511