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Operating Instructions
Chapter
4
CLV490 Bar Code Scanner
8009993/RA61/2007-07-20
©
SICK AG · Division Auto Ident · Germany · All rights reserved
4-13
Installation
2.
Ensure that the incremental encoder is contacting the conveyor and that the friction
wheel turns without slipping.
3.
Connect incremental encoder to the "IN4" switching input of the CLV490 (not available
via the terminals of the CDB420 Connection Module). See
the "IN 0" to "IN 4" switching inputs, Page 5-23
4.4.4
Mounting the sensors for detecting the object distance
If the dynamic focus control function of the CLV490 is triggered by external sensors, suitable
sensors must be mounted in the vicinity of the CLV490.
read operation from above. The sensors must be arranged in such a way that all of the po-
tential object heights are classified uniquely and overlapping reading ranges occur that can
be formed with the depths of field of the CLV490. A maximum of five switching inputs are
available for this purpose. A max. of 32 switching states for 8 distance configurations (read-
ing ranges) can be implemented using the internal assignment table (combinations). Photo-
electric reflex switches, for example, can be used to detect the object distance. In the
default setting, all five "IN 0" ... "IN 4" switching inputs are selected for dynamic focus con-
trol.
1.
The depths of field of the CLV490 for the bar code resolution in question is shown in
the graphs in
Chapter 10.2 Specification diagrams, Page 10-1
onwards. Find and note
suitable focus positions for overlapping reading ranges.
2.
Mount distance sensors (e. g. photoelectric reflex switches) one above the other in a
row at the mounting location to measure the object distance (see also assignment
). It is advisable to mount these distance sensors opposite the
direction of motion of the conveyor belt at approx. 100 mm (3.94 in) in front of the read-
ing pulse sensor.
3.
Connect the distance sensors to the "IN 0" ... "IN 4" switching inputs on the CLV490
via the CDB420 or CDM490 Connection Module (see
"Sensor" switching input, Page 5-22
). Via the terminals of the CDB420 Connection
Module only the IN 0 input can be connected.
Fig. 4-11:
Mounting example for object distance detection
DC1
DC2
DC8
LS1
LS2
LS7
h2
h7
h1
Reading distance
DC = Distance Configuration
Object distance
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