Omron V530-R2000, Руководство пользователя

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111
V530-R2000
User’s Manual
SECTION 9
Appendix
Line
S
p
e
e
d, Re
a
d
ing Time
,
a
nd S
hutte
r Spe
e
d
SECTION 9
Line Speed, Reading Time, and Shutter Speed
Observe the following precautions when reading moving workpieces.
• Always set the Display Mode to still images.
• With live images, the trigger can be delayed by up to 16.6 ms.
Shutter Speed
Use the following formula to set the lower limit of the shutter speed to eliminate image
motion and enable stable reading.
*1: To allow leeway, the number of pixels per cell should be greater than 4.
*2: The allowable motion is 10% of the cell size.
Example: For V = 60 mm/s, C = 1.6 mm, M = 16, A = 10 mm, N = 512, R = 300 ms, L =
30 mm
As shown below, there will be no problem in reading.
The lower limit of the shutter speed is as follows:
Shutter speed T (s)
Code size C (mm)
Symbol size M
Field of vision A (mm)
Number of image pix-
els in direction of
motion
N
Pixels per cell n = (C
´
N)/(A
´
M) *1
Allowable motion W = C/M
´
0.1 (mm) *2
Reading time R (s)
Code interval L (mm)
Line speed V (mm/s)
(Shutter speed: T)
£
(Allowable motion: W)
(Maximum line speed: V)
W
£
0.1
´
(Code size: C)
(Symbol size: M)
C
A
n
£
1.6
´
512
(10
´
16)
= 5.12 > 4
T
£
0.1
´
1.6
(16
´
60)
1
6000
=
s