11.03 3 Safety-Related Functions
3.5 Safely-reduced speed (SG)
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
3-105
Note
The SGEs/SGAs used in the NCK monitoring channel only have to be
assigned by the machine manufacturer in the drive monitoring channel as the
NCK monitoring system is directly mounted. This means that SGEs can be
supplied through one channel when changing the gear ratio (no safety risk).
An exception is the use of SN/SE (see above).
Gear stage selection for Safety Integrated is not part of the crosswise data
comparison between the two channels.
NCK
HW
I/O
NCK
monitoring channel
SBH/SG
SE
SN
per axis/spindle
...
...
SBH/SG
SE
SN
per axis/spindle
PLC
HW
I/O
Drive
monitoring channel
Monitoring
comparators
Monitoring
comparators
O
I
...
...
...
...
...
I
...
...
...
...
O
I/O
images
I/O
images
SG_02.DSF
Pro-
cessing
...
SGE
SGA
Bit 0
Bit 1
Bit 2
Bit 0
Bit 1
Bit 2
PLC
user
program
Result and data
cross-check
1PH6 motor ...
Encoder 1
Gearbox
I1 I2
O1 O2
Spindle
IMS
SGE
SGA
NC
H function
Fig. 3-17 Spindle with 2-encoder system
Table 3-33 Assignment between active gear stage/gear ratio selection
Selection and checkback of
active gear stage
Assignment between ratio
selection for NCK and
PLC/drive
Spindle motor/
load
SGE gear ratio selection
Gear
stage
E1 E2 A1 A2 Bit 2 Bit 1 Bit 0
1 0 0 0 0 0 0 0 4 : 1
2 0 1 0 1 0 0 1 2,5 : 1
3 1 0 1 0 0 1 0 1,6 : 1
4 1 1 1 1 0 1 1 1 : 1
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