Operating Instructions Chapter 4
CLV640 Bar Code Scanner
Product description
8011975/0000/2008-04-14 © SICK AG · Division Auto Ident · Germany · All rights reserved 29
Tab. 4-3: Overview of the bar code scanner's product features and functions
4.6 Bar code scanner methods of operation
The CLV640 Bar Code Scanner is an intelligent sensor system for automatic and non-con-
tact detection and decoding of bar codes. In principle, the codes can be detected on any
side of still or moving objects in a conveyor system (single-side reading).
Several bar code scanners can be combined to allow detection of several sides in one pas-
sage (multi-side reading).
The bar code scanner creates a scanning line (line scanner) to recognise the codes. In the
raster scanner version, the bar code scanner creates eight scanning lines that are moved
parallel to each other.
Line scanner with oscillating mirror
The oscillating mirror additionally deflects the scanning line from the home position to both
sides, perpendicular to the scanning direction, with a low oscillation frequency. This enables
the bar code scanner to scan larger areas for bar codes as well.
The length of the scanning line that is used for the evaluation (reading area height) depends
on the reading distance because of the V-shaped light exit.
The light pattern that is reflected by the bar code is recorded, processed and decoded. To
control this process, external sensors deliver information via the reading pulse, the object
distance and the conveyor speed (increment). The reading results are output to the bar
code scanner's data interfaces and forwarded to a host/PC.
Connection technology (design) • Standard version: Cable with 15-pole D-Sub-HD connector
• Ethernet version: Revolving connector unit on the device with two M12 circular connec-
tors
• Connection module CDB620/CDM420 for connection to the host computer (stan-
dalone) and for integrating into the SICK-specific CAN-SENSOR network
• Bus connection module CMF400
1)
in connection module CDM420 for connecting to
field bus systems
1) Supported by SOPAS-ET from Q4 2007
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