Siemens Sinumerik 840D sl Function Manual page 193

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NCK- -SGE/SGA
The signals are assigned to the NCK--SPL inputs/outputs using machine data.
Note
Only the NCK--SGE 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, the NCK--SGE "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- -SGE/SGA
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--SGE should be processed in the PLC user program that are also
required for the particular application. SGE 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 Chapter 6.3.9 "Forced checking procedure of the external STOPs" for
information about SGE/SGA for the test stop for external stops.
How many SGE/SGA are required as a minimum?
Depending on the particular application, only some of the maximum number of
SGE/SGA available are required.
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Connecting Sensors/Actuators
7.1 Safety- -relevant input/output signals
7-193