Operating Instructions
Chapter
4
CLV 490 Bar Code Scanner
8 009 993/O824/20-12-2004
©
SICK AG · Division Auto Ident · Germany · All rights reserved
4-11
Installation
4.4
Mounting the external components
4.4.1
Mounting the CDB 420 or CDM 490 Connection Module
1.
Mount the CDB 420 or CDM 490 Connection Module near the CLV.
The distance between the connection module and CLV should not exceed max. 10 m
(32.8 ft).
2.
Mount the CDB 420 or CDM 490 in such a way that accessed to the open device is
always possible. The terminal interface of the CLV is accessed via the 9-pin, internal
"Aux" plug.
Detailed information on the mounting and electrical installation procedures is provided in the
"CDB 420 Connection Module"
Operating Instructions
(order no. 8 010 001, German/En-
glish) respectively in the
"CDM 490 Connection Module"
Operating Instructions
(order no.
8 010 005, German/English).
4.4.2
Mounting the external reading pulse sensor
If the CLV is triggered by an external reading pulse sensor, the sensor must be mounted in
the vicinity of the CLV. The "Sensor" switching input is selected as the default trigger source
for this trigger type. The default debounce time of the input is 30 ms.
shows two examples of where a photoelectric reflex switch can be mounted. This
depends on the distance a from the bar code to the front of the object. Depending on the
application, you may need to mount the sensor in such a way that bar codes on objects of
different sizes can be read completely during the reading interval ("internal reading gate").
Note
In default setting, the CLV operates in the autofocus mode "Minimum distance“. As a result,
the CLV focuses on the object that is nearest in Percentage Evaluation mode. The view on
the object with the scan line must be unobstructed, i. e. any other objects must not protude
into the autofocus space. If they do so, the autofocus mode "Differential background“ must
Fig. 4-10:
Line scanner: mounting example for the external reading pulse sensor
b < a
a
b
a
b
b < a
a
(Top view)
Bar code at the start of the object
Bar code in the center or at the end of the object
(Top view)
a
b < a
b < a
b
b