Siemens SINUMERIK 840D sl Function Manual page 165

03.06
Note
The SGE/SGA signals are described in Section 8.3, "Description of Interface
signals".
NCK SGEs/SGAs
The signals are assigned to the NCK-SPL inputs/outputs using machine data.
Note
Only the NCK-SGEs are assigned to an NCK-SPL output that are also required for
the particular application. For axes, where for example, the gear ratio does not
change, then NCK-SGs "ratio selection bit 2 to 0" do not have to be assigned to
SPL inputs. A value of 0 should be entered into the associated MD (i.e. the
NCK-SGE does not have an SPL assignment and is set to 0). This does not apply
to external STOPs that are not used.
PLC SGEs/SGAs
For the drive monitoring channel, the NC/PLC interface (axis/spindle DB) repre-
sents the SGE/SGA interface between the PLC and the drive. The PLC user pro-
gram must supply this interface.
Note
Only the PLC-SGEs should be processed in the PLC user program that are also
required for the particular application. SGEs that are not used must be set to the
value 0 – i.e. to a defined state. This does not apply to external STOPs that are
not used.
See Subsection 6.3.8 "Forced checking procedure of the external STOPs" for
information about SGEs/SGAs for the test stop for external stops.
How many SGEs/SGAs are required as a minimum?
Depending on the particular application, only some of the maximum number of
SGEs/SGAs available are required.
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
Connecting Sensors/Actuators
7.1 Safety-relevant input/output signals
7-165