SICK CLV490 Instrucciones de operaciones descargar pdf (Pagina 94)

Chapter 6 Operating Instructions

CLV490 Bar Code Scanner

Operation

Event-controlled focus position switchover (alternative)

Event-controlled focus position switchover can be used if the autofocus function does not

provide the expected accuracy for the application. Event-controlled focus position

switchover is required in the following cases, for example:

• Conveyed material with a black surface (e.g. vehicle tires)

The laser light emitted by the CLV490 is absorbed by the surface of the material, which

means that the distance measurement may no longer be sufficiently accurate.

• Conveyed material with highly reflective surfaces (e.g. anti-static bags)

• Conveyed material with bar codes on the front edge in the conveying direction. At high

conveyor speeds, the CLV490 can no longer adjust the focus in time.

• Scanning frequency Ö R

EADING CONFIGURATION tab Ö READING PARAMETERS section

• Blank zone Ö R

EADING CONFIGURATION tab Ö READING PARAMETERS/START/STOP RATIO section

• Poor quality bar code print (e.g. small contrast or scattered print) Ö R

EADING

CONFIGURATION tab Ö CODE LABEL/BACKGROUND CHARACTERISTCS section

• If reading bar codes with small height (bar lenght) using the SMART decoder Ö

ODE CONFIGURATION tab Ö DECODER section/SMART PARAMETERS button

Action Settings in CLV-Setup

1. Set up distance

configurations

Ö READING CONFIGURATION tab

Ö READING AREA section

Ö DISTANCE CONFIGURATION button

Ö DISTANCE CONFIGURATION tab

– Focus position

Oscillating mirror:

– additionally: Oscillating mirror amplitude CW

Ö ASSIGNEMENT TABLE tab

– Index

– Valid configurations

To restrict the reading area for all valid distance configurations

proceed as described in Table 6-4, Page 6-11, reading angle

limits

2. Select focus position

switchover (refered to the

start of the reading interval)

Ö READING CONFIGURATION tab

Ö FOCUS CONTROL sections

Ö INPUTS/SERIAL/AUTOFOCUS

– immediate or synchronous (default setting) or

– latched (special application)

3. I

NPUTS/SERIAL trigger source:

select function for "IN 3"

and "IN 4" switching inputs

Ö DEVICE CONFIGURATION tab

Ö ASSIGNMENT OF INPUTS section

Ö IN 3

–Focus control

Ö IN 4

–Focus control

Table 6-8: Guide: Configuring focus position switchover

d) Parameterizing optical reading characteristics

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 269 270

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SICK CLV490 Instrucciones de operaciones Pagina 94

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