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

2.6

Miscellaneous points regarding gantry axes

Manual travel
It is not possible to traverse a synchronized axis directly by hand in JOG mode. Traverse
commands entered via the traversing keys of the synchronized axis are ignored internally in
the control. Rotation of the handwheel for the synchronized axis has no effect either.
Handwheel override
An overriding motion by means of the handwheel can only be applied to the leading axis in
coupled axis mode. In this case, the synchronized axes traverse in synchronism with the
leading axis.
DRF offset
A DRF offset can only be applied to the leading axis. In this case, the synchronized axes
traverse in synchronism with the leading axis.
Programming in part program
Only the leading axis of a gantry axis grouping may be programmed in the part program. An
alarm is generated while programming a synchronized axis, even when a gantry axis
grouping is released (MD37140 $MA_GANTRY_BREAK_UP = 1).
PLC or command axes
Only the leading axis of the gantry grouping can be traversed by the PLC using FC 18 or as a
command axis by means of synchronized actions.
References:
• Function Manual, Basic Functions, Basic PLC Program (P3)
• Function Manual, Synchronized Actions
PRESET
The PRESET function can only be applied to the leading axis. All axes in the gantry grouping
are reevaluated internally in the control when PRESET is activated. The gantry axis 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 leading axis is known in several channels, its
synchronized 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).
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
2.6 Miscellaneous points regarding gantry axes
G1: Gantry axes
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