Rockwell Automation Allen-Bradley 140M, Руководство пользователя

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Rockwell Automation Publication 450L-UM001F-EN-P - March 2022 149
Chapter 9 Connected Components Workbench Software
Floating Blanking Rules
Table 66 shows the rules for floating blanking for the minimum object size. The
Connected Components Workbench software enforces these blanking rules
automatically. Since the transceiver sticks are synchronized with either the
first or last beams, only one end of the stick can be blocked (not both ends).
Object Height
Table 67 on page 150 shows the formulas for calculating the minimum and
maximum object height. The height of the object must be maintained between
the minimum and maximum values for the OSSD outputs to remain ON.
Figure 145 on page 150 shows an example of a maximum object size selection of
2 and tolerance of -1 for both finger and hand resolution. For finger resolution,
the beam width is 3.91 mm (0.15 in.). The worst-case tolerance of beam spacing
is 9.42 mm (0.37 in.) for minimum and 9.38 mm (0.37 in.) for maximum. An
object that has a height larger than 13.33 mm (0.52 in.) and less than 14.85 mm
(0.58 in.) does not cause the OSSD outputs to turn OFF. If the object height
falls below 13.33 mm (0.52 in.) or exceeds 14.85 mm (0.58 in.), the OSSD outputs
turn OFF.
Table 65 - Floating Blanking Settings
Setting Description
Blanking type Select Floating Blanking.
Minimum lens number This setting is the first that participates in the range of lenses.
Maximum lens number This setting is the last lens that participates in the range of lenses.
Object monitoring Always enabled for floating blanking.
Object size
Select the number of lenses typically blocked by the object. The number is subject to
certain rules (see
Table 66 ).
Object size tolerance
The safety light curtain allows the object size to be smaller by either 1 or 2 lenses for
finger resolution and 1 lens for hand resolution. Select the number of lenses that
accommodate the variation in object size. The number is subject to certain rules
(see
Table 66 ).
Other zones
Select normal operation, reduced resolution one object, or reduced resolution two
objects for the other zones.
Table 66 - Floating Blanking Rules
Resolution
Object Size
(Min)
Object Size
Tolerance
Include/
Exclude Lens
1
Min Lens
Value
Max Lens
Value
Rules
Finger
(14 mm
[0.55 in.])
2 -1
Include 1 6,7,8…n-1
Since lens 1 is blanked, the last lens cannot be blanked.
Max lens must be at least equal to or greater than min lens by a value of 5.
Exclude 3,4,5…n-5 8,9,10…n
Since lens 1 is not blanked, lens 2 cannot be blanked.
Max lens must be at least equal to or greater than min lens by a value of 5.
3 -2
Include 1 7,8,9…n-1
Since lens 1 is blanked, the last lens cannot be blanked.
Max lens must be at least equal to or greater than min lens by a value of 6.
Exclude 3,4,5…n-6 9,10,11…n
Since lens 1 is not blanked, lens 2 cannot be blanked.
Max lens must be at least equal to or greater than min lens by a value of 6.
Hand
(30 mm [1.18
in.])
4 -1
Include 1 13, 15…n-3
Since lens 1 is blanked, the last lens cannot be blanked.
Max lens must be an odd number at least equal to or greater than the min lens by a
value of 12.
Exclude 4,6,8…n-8 15,17…n-1
Since lens 1 is not blanked, lens 2 cannot be blanked.
Min lens number must be an even number with a value at least equal or greater
than 4.
Max lens must be an odd number at least equal to or greater than min lens by a
value of 11.