Siemens SINUMERIK 840D sl Function Manual page 178

G1: Gantry axes
2.7 Examples
Note
The same procedure must be followed when starting up a gantry grouping in which the
coupled axes are driven by linear motors and associated measuring systems.
The error limits entered into machine data MD37110 and MD37120 are considered as
additional tolerance values of the actual-value difference of the master and following axis if
the IS "Gantry is synchronous" is not present (e.g. to be resynchronized after canceling
alarms without gantry).
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Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions