Siemens sinumerik 840D sl Function Manual page 161

2.5 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 when a synchronized axis is programmed.
PLC or command axes
Only the leading axis of the gantry grouping can be traversed by the PLC using FC18 or as a
command axis by means of synchronized actions.
References:
/FB1/ Function Manual, Basic Functions, Basic PLC Program (P3)
/FBSY/ 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 axes then
lose their reference and synchronization (IS "Gantry grouping synchronized" = "0").
Axis replacement
All axes in the gantry grouping are released automatically in response to a RELEASE
command (leading axis).
A replacement of the master axis of a closed gantry grouping is only possible, if all axes of
the grouping are known in the channel in which they are to be transferred, otherwise alarm
10658 is signaled.
Special functions: Gantry Axes (G1)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
2.5 Miscellaneous points regarding gantry axes
Detailed description
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