Siemens SINUMERIK 802D sl Function Manual page 92

Gantry axes (G1)
6.3 Referencing and synchronizing gantry axes
● Difference is higher than the gantry warning limit for the synchronized axis:
The following flowchart illustrates the referencing and synchronization processes.
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The position value is defined by the leading axis:
MD34100 REFP_SET_POS (reference point for incremental system)
The absolute encoders and distanced-coded encoders of the leading axis will be set to
the current actual position of the leading axis or to the reference point by the following
machine data:
MD34330 REFP_STOP_AT_ABS_MARKER (distancecoded linear measuring system
without destination point)
For this operation, the axes traverse at the same velocity as set for reference point
approach:
MD34070 REFP_VELO_POS (reference point positioning velocity)
As soon as all gantry axes have reached their target position (ideal position), IS "Gantry
grouping is synchronized" is set to "1" followed by re-activation of the gantry axis
coupling. The position actual value of all axes in the gantry grouping must now be
identical. The gantry synchronization process is now complete.
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
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.
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0