Siemens SINUMERIK 840D sl Function Manual page 735

DB31, ...
DBX101.4
Edge evaluation: No
Signal state 1 or edge
change 0 → 1
Signal state 0 or edge
change 1 → 0
Signal irrelevant for ...
Corresponding to ....
DB31, ...
DBX101.5
Edge evaluation: No
Signal state 1 or edge
change 0 → 1
Signal state 0 or edge
change 1 → 0
Signal irrelevant for ...
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Gantry synchronization ready to start
After gantry axis referencing, the monitoring function has detected that the position actual
value deviation between the leading and synchronized axes is greater than the gantry warning
limit:
MD37110 $MA_GANTRY_POS_TOL_WARNING (gantry warning limit)
It is therefore not possible to start the automatic synchronization compensatory motion of the
gantry axes internally in the control.
The compensatory motion must be started by the user or the PLC user program (IS "Start
gantry synchronization"). The signal is processed for the gantry leading axis only.
After the synchronization compensatory motion has been started by the PLC user program (IS
"Start gantry synchronization" = "1").
Gantry synchronized axis
MD37110 $MA_GANTRY_POS_TOL_WARNING (gantry warning limit)
DB31, ...DBX29.4 (gantry synchronization ready to start)
DB31, ...DBX60.4 and 60.5 (referenced / synchronized 1/2)
Gantry grouping is synchronized
The gantry axis grouping defined with the following machine data is synchronized:
MD37100 $MA_GANTRY_AXIS_TYPE (gantry axis definition)
Any existing misalignment between the leading and synchronized axes (e.g. after start-up of
the machine) is eliminated by gantry axis synchronization (see Section "Start-up of gantry
axes").
The synchronization process is initiated either automatically once the gantry axes have been
referenced or via the PLC user program (IS "Start gantry synchronization").
The compensation values for temperature and sag do not become effective internally in the
control until the gantry grouping is synchronized.
Note:
IS "Gantry grouping is synchronized" is output to the PLC via the PLC interface of the leading
axis.
The gantry axis grouping defined with the following machine data is not synchronized:
MD37100 $MA_GANTRY_AXIS_TYPE (gantry axis definition)
which means that the positions of the leading and synchronized axes may not be ideally
aligned (e.g. gantry misalignment).
Workpiece machining with a non-synchronized gantry axis grouping will result in impaired
machining accuracy or mechanical damage to the machine.
The gantry grouping becomes desynchronized if:
• The gantry axes were in "Follow-up" mode
• The reference position of a gantry axis is no longer valid or the axis is referenced again (IS
"Referenced/Synchronized")
• The gantry grouping has been invalidated via the following machine data:
MD37140 $MA_GANTRY_BREAK_UP (invalidate gantry axis grouping)
Gantry synchronized axis
Signal(s) updated: Cyclic
Signal(s) updated: Cyclic
Z3: NC/PLC interface signals
21.2 Gantry Axes (G1)
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