Siemens sinumerik 840D sl Function Manual page 159

Start-up support for gantry groupings
The start-up functions of the function generator and measuring are parameterized via the PI
service. All parameterized axes commence traversing when the NC Start key on the MCP
panel is pressed in JOG mode.
A window is displayed in the "Measuring function and function generator in gantry grouping"
operator interface. Two amplitude values, each with an offset and bandwidth, must be
entered in this window. The first amplitude value applies to the measuring axis and the
second to the other coupled axes.
2.4 PLC interface signals for gantry axes
Special IS for gantry axes
The special PLC interface signals of the coupled gantry axes are taken via the axial PLC
interface of the leading or synchronized axes. Table below shows all special gantry-PLC
interface signals along with their codes and indicates whether the IS is evaluated on the
leading axis or the synchronized axis.
Table 2-2 Assignment of gantry-PLC interface signals to leading and synchronized axes
PLC interface signal
Start gantry synchronization
No automatic synchronization
Gantry axis
Gantry leading axis
Gantry grouping is synchronized
Gantry synchronization ready to start
Gantry warning limit exceeded
Gantry trip limit exceeded
Effect of axial interface signals on gantry axes
a) Axial interface signals from PLC to axis (PLC → NCK)
The axial interface signals from the PLC to the axis are always referred to all gantry axes in
the grouping. In this case, all gantry axes (leading and synchronized axis) have equal
priority.
For example, all axes in the gantry groupings will be simultaneously shut down when the
following interface signal is set to "0" from the leading axis:
DB31, ... DBX2.1 (servo enable)
The following table shows the effect of individual interface signals (from PLC to axis) on
gantry axes:
Special functions: Gantry Axes (G1)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
PLC$NCK DB31, ... DBX...
! 29.4
! 29.5
z 101.7
z 101.6
z 101.5
z 101.4
z 101.3
z 101.2
Detailed description
2.4 PLC interface signals for gantry axes
Leading axis
X
X
1
1
X
X
Synchronized axis
1
0
X
X
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