Siemens SINUMERIK 840D sl Function Manual page 808

Z3: NC/PLC interface signals
25.2 G1: Gantry axes
DB31, ...
DBX101.5
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
Signal state 0 or edge
change 1 → 0
Corresponding to ....
808
Gantry grouping is synchronized
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 ma‐
chining 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● The reference position of a gantry axis is no longer valid or the axis is referenced again (IS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)
The axis is defined as the synchronized axis within a gantry axis grouping (see MD37100).
It is not possible to traverse a synchronized axis directly by hand (in JOG mode) or to program
it in a part program.
Note:
The following interface signals are output to the PLC via the PLC interface of the gantry
synchronized axis:
DB31, ... DBX101.3 (warning limit exceeded)
DB31, ... DBX101.2 (gantry trip limit exceeded)
The NCK does not evaluate individual axial PLC interface signals for the synchronized axis.
MD37100 $MA_GANTRY_AXIS_TYPE (gantry axis definition)
DB31, ...DBX101.7 (gantry axis)
Signal(s) updated: Cyclic
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Special functions