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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
4-13
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 CLV (not available via
the terminals of the CDB 420 Connection Module). See
"IN 0" to "IN 4" switching inputs, Page 5-24
.
4.4.4
Mounting the sensors for detecting the object distance
If the dynamic focus control function of the CLV is triggered by external sensors, suitable
sensors must be mounted in the vicinity of the CLV.
operation from above. The sensors must be arranged in such a way that all of the potential
object heights are classified uniquely and overlapping reading ranges occur that can be
formed with the depths of field of the CLV. A maximum of five switching inputs are available
for this purpose. A max. of 32 switching states for 8 distance configurations (reading ranges)
can be implemented using the internal assignment table (combinations). Photoelectric 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 control.
1.
The depths of field of the CLV 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 suit-
able 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 CLV via the
CDB 420 or CDM 490 Connection Module (see
Chapter 5.5.7 Connecting the "Sensor"
). Via the terminals of the CDB 420 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