Siemens SINUMERIK 840D sl Function Manual page 175

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.
See Chapter "Forced checking procedure of the external STOPs (Page 131)" for information
about SGE/SGA for the test stop for external stops.
PLC-SGE/SGA
For the drive monitoring channel, the NC/PLC interface (axis/spindle DB) represents the SGE/
SGA interface between the PLC and the drive. The PLC user program must supply this
interface.
Note
Only the PLC-SGE should be processed in the PLC user program, which 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 "Forced checking procedure of the external STOPs (Page 131)" 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.
Function
Safe Operating Stop (SBH)
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Minimum SGEs required
SBH/SG deselection
Test stop selection (drive)
External stops
if gearbox stages are being used
Gear ratio selection, bit 2 (only if it is neces‐
sary to select the ratio)
Gear ratio selection, bit 1 (only if it is neces‐
sary to select the ratio)
Gear ratio selection, bit 0 (only if it is neces‐
sary to select the ratio)
Connecting sensors and actuators
8.1 Safety-related input/output signals
Minimum SGAs required
SBH/SG active
Status, pulses cancelled (drive)
STOP A/B, C, D, E active (only if re‐
quired)
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