Siemens SINUMERIK 840D sl Function Manual page 168

G1: Gantry axes
2.5 PLC interface signals for gantry axes
NC/PLC interface signal
Ramp-function generator fast stop (RFGFS)
Select drive parameter set
Enable Pulses
DB31, ... DBX1.5 and 1.6 (position measuring system 1/2)
The switchover between position measuring systems 1 and 2 applies individually for each gantry axis. However,
deactivation of both position measuring systems (known as the parking position) applies as a common signal for all gantry
axes.
DB31, ... DBX2.1 (servo enable)
If the servo enable signal on one gantry axis is canceled, all axes in the gantry grouping are shut down simultaneously. The
method by which shutdown is implemented (e.g. with fast stop) is identical for all gantry axes.
Either the "Follow-up" state (IS of one gantry axis = 1) or the "Stop" state (IS of all gantry axes
= 0) is activated for all gantry axes, depending on interface signal:
DB31, ... DBX1.4 (follow-up mode)
b) Axial interface signals from axis to PLC (NCK → PLC)
Each of the axial, axis-to-PLC interface signals for the synchronized axis and the leading axis
is always set on an axis-specific basis and output to the PLC.
Example:
DB31, ... DBX60.4 resp. 60.5 (referenced/synchronized 1/2).
Exception:
When the leading axis is traversed, the interface signal will also be set for the synchronizing
axis:
DB31, ... DBX64.6 and 64.7 (traverse command plus resp. minus)
168
Effect on
DB31, ... DBX ...
Leading axis
20.1 On all axes in gantry grouping
21.0 - 21.2 Axial
21.7 Axial
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Synchronous axis
Axial
Axial
Special Functions