3 Safety-Related Functions 11.03
3.5 Safely-reduced speed (SG)
© Siemens AG 2003 All Rights Reserved
3-102 SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
For 840D MD 36978: $MA_SAFE_OVR_INPUT
[
n
]
(input assignment for override selection)
The SG override factors themselves (percentage values) are defined via the
following machine data:
For 840D MD 36932: $MA_SAFE_VELO_OVR_FACTOR[n]
(override factor safely-reduced speed)
For 611 digital MD 1332: $MD_SAFE_VELO_OVR_FACTOR
[n]
3.5.7 Example: Override for safely-reduced speed
When safely-reduced speeds are selected, the speed limit values must be set
as follows.
Table 3-27 Example of how override values are used for safely-reduced speed
SGE SG selection SGE override selection Effective speed limit value
Bit 1 Bit 0 Bit 3 Bit 2 Bit 1 Bit 0 Assumptions for the
example
0 0 x x x x Limit value 1 1000 mm/min
0 1 0 0 0 0 Limit value 2 with override 0 100 % = 2000 mm/min
- " - 0 0 0 1 Limit value 2 with override 1 80 % = 1600 mm/min
- " - 0 0 1 0 Limit value 2 with override 2 50 % = 1000 mm/min
- " - 0 0 1 1 Limit value 2 with override 3 30 % = 600 mm/min
1 0 x x x x Limit value 3 4000 mm/min
1 1 0 0 0 0 Limit value 4 with override 0 100 % = 5000 mm/min
- " - 0 0 0 1 Limit value 4 with override 1 80 % = 4000 mm/min
- " - 0 0 1 0 Limit value 4 with override 2 50 % = 2500 mm/min
- " - 0 0 1 1 Limit value 4 with override 3 30 % = 1500 mm/min
Notes:
x: Signal status is optional since override values are not effective for SG1 and SG3
SGEs "SG override selection bits 3 and 2" are not needed to select an SG override, i.e. they do not need to be
configured (they are set to "0" internally).
• The example applies to the 1st axis on a SINUMERIK 840D/
SIMODRIVE 611 digital.
• Definition of SGEs in the NCK monitoring channel
Logical slot for the terminal block: 6
Slot number of sub-module for SGEs: 4
I/O number for signal "SG selection bit 1": 2
I/O number for signal "SG selection bit 0": 1
I/O number for signal "override selection bit 1": 4
I/O number for signal "override selection bit 0": 3
Defining SG
override factors
Task assignment
Assumptions for the
example
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