Example: Override For Safely-Reduced Speed - Siemens SINUMERIK 840D Description Of Functions

3 Safety-Related Functions
3.5 Safely-reduced speed (SG)
For 840D
The SG override factors themselves (percentage values) are defined via the
Defining SG
override factors following machine data:
For 840D
For 611 digital
3.5.7

Example: Override for safely-reduced speed

Task assignment 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
Bit 1 Bit 0 Bit 3
0 0 x
0 1 0
- " - 0
- " - 0
- " - 0
1 0 x
1 1 0
- " - 0
- " - 0
- " - 0
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).
•
Assumptions for the
example
•
3-102
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
MD 36978: $MA_SAFE_OVR_INPUT [ n ]
(input assignment for override selection)
MD 36932: $MA_SAFE_VELO_OVR_FACTOR[n]
(override factor safely-reduced speed)
MD 1332: $MD_SAFE_VELO_OVR_FACTOR [ n ]
Effective speed limit value
Bit 2 Bit 1 Bit 0
x x x Limit value 1
0 0 0 Limit value 2 with override 0
0 0 1 Limit value 2 with override 1
0 1 0 Limit value 2 with override 2
0 1 1 Limit value 2 with override 3
x x x Limit value 3
0 0 0 Limit value 4 with override 0
0 0 1 Limit value 4 with override 1
0 1 0 Limit value 4 with override 2
0 1 1 Limit value 4 with override 3
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:
Slot number of sub-module for SGEs:
I/O number for signal "SG selection bit 1":
I/O number for signal "SG selection bit 0":
I/O number for signal "override selection bit 1":
I/O number for signal "override selection bit 0":
Assumptions for the
example
1000 mm/min
100 % = 2000 mm/min
80 % = 1600 mm/min
50 % = 1000 mm/min
30 % = 600 mm/min
4000 mm/min
100 % = 5000 mm/min
80 % = 4000 mm/min
50 % = 2500 mm/min
30 % = 1500 mm/min
6
4
2
1
4
3
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11.03