Siemens SINUMERIK 840D sl Function Manual page 153

Solution
A configuration of the relevant axes in an axis container specified in machine data enables
different machine axes to be located in succession behind a channel axis that remains
constant. Advancing the rotary table or drum is performed synchronously with the advancing
of the axes entered in the axis container.
Axes in an axis container can also be configured as geometry axes.
Note
The axis container has no mode group reference, i.e. the workpiece-holding, traveling axis
can change from one mode group to another at different machining stations.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Several Operator Panels on Several NCUs, Distributed Systems (B3)
Link axes
153