Siemens sinumerik 840D sl Function Manual page 913

Detailed description
2.2 Gantry Axes (G1)
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 ...
Application example(s)
Corresponding to ....
DB31, ...
DBX101.6
Edge evaluation: No
Signal state 1 or edge
change 0 → 1
12
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The reference position of a gantry axis is no longer valid or the axis is referenced again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
Machining should be enabled only if the gantry axes are already synchronized. This can be
implemented in the PLC user program by combining NC Start with IS "Gantry grouping is
synchronized".
DB31, ... DBX29.4 (gantry synchronization ready to start)
DB31, ... DBX60.4 and 60.5 (referenced/synchronized 1 / 2)
MD37140 $MA_GANTRY_BREAK_UP (invalidate gantry axis grouping)
Gantry leading axis
The axis is defined as the leading axis within a gantry axis grouping (see MD37100).
Note:
The following interface signals are evaluated or output to the PLC via the PLC interface of the
gantry leading axis:
DB31, ... DBX29.4 (gantry synchronization ready to start)
DB31, ... DBX101.5 (gantry grouping is synchronized)
Signal(s) updated: Cyclic
Signal(s) updated: Cyclic
Special functions: NC/PLC interface signals (Z3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0