Plc Interface Signals For Gantry Axes - Siemens SINUMERIK 840D sl Function Manual

2.5

PLC interface signals for gantry axes

Special IS for gantry axes
The special NC/PLC interface signals of the coupled gantry axes are taken via the axial NC/
PLC interface of the leading or synchronized axes. The table below shows all special gantry
NC/PLC interface signals along with their codes and indicates whether the IS is evaluated on
the leading axis or the synchronized axis.
NC/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:
NC/PLC interface signal
Axis/spindle disable
Position measuring system 1/2
Controller enable
Delete distance to go (axial)
Clamping in progress
Reference point value 1-4
Feed stop
Hardware limit switch plus/minus
2. Hardware limit switch plus / minus
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
To axis (PLC → NCK) or
from axis (NCK → PLC)
PLC → NCK
PLC → NCK
NCK → PLC
NCK → PLC
NCK → PLC
NCK → PLC
NCK → PLC
NCK → PLC
DB31, ... DBX ...
1.3
1.5 and 1.6
2.1
2.2
2.3
2.4 - 2.7
4.3
12.0 and 12.1
12.2 and 12.3
2.5 PLC interface signals for gantry axes
DB31, ...
Leading axis
DBX...
29.4 X
29.5 X
101.7 1
101.6 1
101.5 X
101.4 X
101.3
101.2
Effect on
Leading axis
On all axes in gantry
grouping
1)
Axial
On all axes in gantry grouping
Axial
Axial
Axial
On all axes in gantry grouping
Axial alarm: Brake request on all axes in gantry
grouping
Axial
G1: Gantry axes
Synchronous axis
1
0
X
X
Synchronous axis
No effect
1)
Axial
2)
No effect
Axial
Axial
Axial
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