Siemens SINUMERIK 840D sl Function Manual page 501

Special functions
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Gantry axes
Only one of the clearance-controlled axes may be configured as the master axis of a gantry
grouping, defined via machine data:
MD37100 $MA_GANTRY_AXIS_TYPE (gantry axis definition)
Following axes in a gantry grouping may not be used in the context of clearance control.
Displaying the axis position
The actual current axis position of a clearance-controlled axis as the sum of an interpolatory
axis position and the current position offset of clearance control is not displayed in the main
machine screen on a SINUMERIK standard HMI:
SINUMERIK HMI Advanced
SINUMERIK HMI Embedded
With the HMIs mentioned, the actual current axle position is displayed on the service screen
Operating area switchover > Diagnosis > Service Displays > Axle/ Spindle as the "actual
position value".
NC channels
The "clearance control" technological function is only available in the first NC channel, even
on controls with more than one NC channel.
Only channel axes in the first NC channel may be used as clearance-controlled axes.
CLC part program commands may only be used in part programs processed in the first NC
channel.
Conflict with other machine data
Using the following machine data is not permitted:
MD30132 $MA_IS_VIRTUAL_AX = 1 (axis is virtual axis)
Note
The "clearance control" technological function is only available in the first NC channel!
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
TE1: Clearance control
11.9 Boundary conditions
501

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