Siemens SINUMERIK 840D Description Of Functions page 105

11.03
Gear stage selection for Safety Integrated is not part of the crosswise data
comparison between the two channels.
Spindle
Encoder 1
Gearbox
1PH6 motor ...
I1 I2
IMS
Fig. 3-17 Spindle with 2-encoder system
Table 3-33
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
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).
NCK
I/O
HW
images
I/O
I
...
...
...
O
...
...
...
O1 O2
I
...
...
...
O
...
...
...
PLC
I/O
HW
images
I/O
SG_02.DSF
Assignment between active gear stage/gear ratio selection
Selection and checkback of
active gear stage
Gear E1 E2 A1
stage
1 0 0 0
2 0 1 0
3 1 0 1
4 1 1 1
3 Safety-Related Functions
3.5 Safely-reduced speed (SG)
Pro-
SGE
cessing
monitoring channel
SGA
Bit 0
Bit 1
Bit 2
NC
H function
Bit 0
Bit 1
Bit 2
PLC
user
program
SGE
SGA
Assignment between ratio
selection for NCK and
PLC/drive
SGE gear ratio selection
A2 Bit 2 Bit 1 Bit 0
0 0 0 0
1 0 0 1
0 0 1 0
1 0 1 1
NCK
SBH/SG
SE
SN
Monitoring
comparators
per axis/spindle
Result and data
cross-check
SBH/SG
SE
SN
Monitoring
comparators
per axis/spindle
Drive
monitoring channel
Spindle motor/
load
4 : 1
2,5 : 1
1,6 : 1
1 : 1
3-105