Siemens SINUMERIK 840D sl Function Manual page 150

G1: Gantry axes
2.2 "Gantry axes" function
Disturbance characteristic
If faults occur, which cause an axis of the gantry to be stopped, then the complete gantry
grouping is always stopped.
Opening the gantry grouping
The axis coupling within a gantry grouping can be opened (dissolved) using the following
machine data:
MD37140 $MA_GANTRY_BREAK_UP = 1 (invalidate gantry grouping)
When the setting becomes active, the axes of the gantry grouping can be individually
traversed in the JOG, AUTOMATIC and MDI modes.
The monitoring functions of the synchronism difference and/or the alarm and trip limits are not
active.
The NC/PLC interface signal "Gantry grouping is synchronized" is reset:
DB31, ... DBX101.5 == 0
If the gantry axes remain mechanically coupled, there is a risk of damage to the machine
when the leading or synchronous axes are traversed in this operating state!
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CAUTION
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions