SICK CLV 45 Series, Руководство по эксплуатации

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Operating Instructions Chapter 6
CLV 45x Bar Code Scanner
Operation
8 009 139/K949/06-06-2002 © SICK AG · Division Auto Ident · Germany · All rights reserved
6-11
"Fixed position" operating mode
The CLV parks the oscillating mirror at the desired position. 10 CW correspond to –20
°
, and
90 CW to +20
°
( Fig. 4-8, Page 4-6 ). In the default setting, the fixed position is set to 50 CW
(angle of deflection of 105
°
). The oscillating mode is switched off.
"One-Shot" mode
In the "One-Shot" mode the oscillating mirror only performs one specific oscillating move-
ment per reading interval. This movement consists of a forward phase and a return phase.
The start position of the scan line, the mirror speed and the valid distance configuration can
be parameterized separately for each phase. The end position of the one phase forms the
start position of the other phase. Fig. 6-5 shows an example for the application in object
tracking. During the forward phase, the front of the object that moves towards the oscillating
mirror is swept once by the scan line from top to bottom in accordance with the conveyor
speed. Multiple focus position switchovers are not necessary as the required reading range
(DOF) is much smaller than with the line scanner. Chapter 10.7.2 Calculating the start posi-
tion and mirror speed for the forward and return phase of the One-Shot function,
Page 10-37 explains how the start position and mirror speed are calculated for a given con-
veyor speed.
Possible trigger sources for One-Shot:
•
"Sensor 2" switching input
•
Command string (via serial interface)
•
Start of the reading interval
Fig. 6-5: One-Shot: Object tracking (bar code read from front)
D t
0
D t
1
Conventionally required reading range
Reduced reading range through One-Shot function
Line scanner
Line scanner
with oscillating
mirror
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