Siemens SINUMERIK 840D sl Function Manual page 186

Connecting Sensors/Actuators
7.1 Safety–related input/output signals
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 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–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 6.3.8 "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.
Table 7-1 SGE/SGA required as a minimum
Function Minimum SGEs required
Safe operating SBH/SG deselection
stop (SBH) Test stop selection (drive)
External stops
if gearbox stages are being used
Gear ratio selection, bit 2 (only if it is necessary to
select the ratio)
Gear ratio selection, bit 1 (only if it is necessary to
select the ratio)
Gear ratio selection, bit 0 (only if it is necessary to
select the ratio)
7-186
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
Minimum SGAs required
SBH/SG active
Status, pulses cancelled
(drive)
STOP A/B, C, D, E active
(only if required)
© Siemens AG 2008 All Rights Reserved
05.08