Siemens sinumerik 840D sl Function Manual page 146

Detailed description
2.2 Referencing and synchronization of gantry axes
• Difference is higher than the gantry warning limit for at least one synchronized axis:
is not started automatically in this case, but must be started explicitly by the operator or
from the PLC user program. The process is initiated by IS "Start gantry synchronization"
on the leading axis. The signal is set on the leading axis. The operational sequence is
then the same as that described above.
The following flowchart illustrates the referencing and synchronization processes.
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IS "Gantry synchronization read to start" is set to "1" and the message "Wait for
synchronization start of gantry grouping x" is output. The gantry synchronization process
Special functions: Gantry Axes (G1)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0