Miscellaneous Points Regarding Gantry Axes - Siemens SINUMERIK 840D Function Manual

9.7

Miscellaneous points regarding gantry axes

Manual traversing
It is not possible to traverse a synchronous axis directly by hand in JOG mode. Traverse
commands entered via the traversing keys of the synchronous axis are ignored internally in the
control. Rotation of the handwheel for the synchronous axis has no effect either.
Handwheel override
An overriding motion by means of the handwheel can only be applied to the guide axis in
coupled axis mode. In this case, the synchronous axes traverse in synchronism with the guide
axis.
DRF offset
A DRF offset can only be applied to the guide axis. In this case, the synchronous axes traverse
in synchronism with the guide axis.
Programming in the part program
Only the guide axis of a gantry axis grouping may be programmed in the part program. An alarm
is generated while programming a synchronous axis, even when a gantry axis grouping is
released (MD37140 $MA_GANTRY_BREAK_UP = 1).
PLC or command axes
Only the guide axis of the gantry grouping can be traversed by the PLC using FC 18 or as a
command axis by means of synchronized actions.
Further information
● Function Manual PLC
● Function Manual Synchronized Actions
PRESET
The PRESET function can only be applied to the guide axis. All axes in the gantry grouping are
reevaluated internally in the control when PRESET is activated. The gantry axes then lose their
reference and synchronization:
DB31, ... DBX101.5 (gantry grouping is synchronized) = 0
Channel assignment of the gantry axes
Please ensure that for a gantry grouping whose guide axis is known in several channels, its
synchronous axes in these channels are also known. If this is not the case, Alarm 10651 is
output with reason 60XX (XX is the objectionable gantry grouping).
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
9.7 Miscellaneous points regarding gantry axes
G1: Gantry axes
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