Example: Override For Safely Reduced Speed - Siemens SINUMERIK 840D sl Function Manual

7.5.5

Example: Override for safely reduced speed

Task
When safely reduced speeds are selected, the speed limit values must be set as follows.
Table 7-7
SGE
SG se‐
lection
Bit
1
0
0
As
above
As
above
As
above
1
1
As
above
As
above
As
above
Note:
x: Signal status is optional since override values are not effective for SG1 and SG3
SGEs "SG override selection bit 3 and bit 2" are not required to select an SG override - i.e. they do not
need to be configured (they are internally set to "0").
Assumptions for the example
Defining the SGEs in the NCK monitoring channel
I/O number for signal SG selection, bit 1:
I/O number for signal SG selection, bit 0:
I/O number for signal override, bit 1:
I/O number for signal override, bit 0:
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Application example of how override is used for safely reduced speed
SGE override selec‐
tion
Bit Bit Bit Bit Bit 0
0 3 2 1
0 x x x x
1 0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 x x x x
1 0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
Safety functions integrated in the system/drive
Effective speed limit value
Limit value 1
Limit value 2 with override stage
0
Limit value 2 with override stage
1
Limit value 2 with override stage
2
Limit value 2 with override stage
3
Limit value 3
Limit value 4 with override stage
0
Limit value 4 with override stage
1
Limit value 4 with override stage
2
Limit value 4 with override stage
3
→ OUTSI[13]
→ OUTSI[14]
→ OUTSI[17]
→ OUTSI[18]
7.5 Safely reduced speed (SG)
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
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