Name: SICK Advanced Series
Brand: SICK
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Chapter 6 Operating Instructions

CLV490 Bar Code Scanner

Operation

The time at which focusing occurs relative to the reading pulse can be selected for both

types of focus control.

Autofocus

Condition: Reading from above

• Minimum distance:

Relative to its surroundings, the object is always located at the shortest distance from

the CLV490. Example: object positioned directly on the conveyor belt without a

container (tray, etc.) or interfering side boundaries

Condition: only one object in the reading field during the reading interval.

• Differential background:

The background can be closer to the CLV490 than the object.

Example: object in a container on the conveyor belt; the container wall is higher than

the object (closer to the CLV490).

Condition: only one object in the reading field during the reading interval.

• Differential background and tracking:

Same as the "Differential background" function, except that in each reading pulse more

than one object can be located in the reading field at the same time. On the basis of

the detected distances, the CLV490 assigns the required focus positions in its internal

focus list to the objects and organizes the objects using a continuous increment in its

object list. In this way, scanned bar-code information can be uniquely assigned to the

individual objects. This is only available in the reading mode "Tracking" (internal tracking

or reading mode "OTS trigger"), not in "Object polling" mode (one object only) of start/

stop mode. For more detailed information, see also Chapter A2. Tracking mode

(controlled by Increment), Page 6-27.

Explanation Background teach-in:

For autofocus modes "Differential background" and "Differential background and tracking",

the CLV490 can also teach in the ambient background in its area of view (e.g. if interfering

objects in the conveyor system project into the defined autofocus area) in order to improve

the evaluation of the current distance profile. When doing so, the CLV490 adjusts – among

other things – the measured background by 100 mm (3.9 in) in its direction to compensate

any measurement inaccuracies.

The default background at a distance of 2,200 mm (86.7 in) is used in all other cases and,

if necessary, the autofocus area is limited by means of the appropriate parameters. In this

Action Settings in CLV-Setup

Activate autofocus

– or –

Ö READING CONFIGURATION tab

Ö FOCUS CONTROL section

– Autofocus

Activate focus position switch-

over (event-controlled)

(selecting trigger source)

Ö READING CONFIGURATION tab

Ö FOCUS CONTROL section

– Inputs/Serial or

–Timer Ö T

IMER or

– Static/No trigger

Oscillating mirror:

– additionally: Oscillating mirror extrema

Table 6-5: Guide: Selecting the focus control mode

c) Parameterizing focus control

Light Source	LED, visible red light (660 nm)
Protection Class	IP65
Typical Scan Rate	500 scans/s
Ambient Operating Temperature	0 °C ... +50 °C
Power Supply	10 V DC ... 30 V DC

SICK Advanced Series User Manual

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SICK Advanced Series Specifications

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