SICK CLV490 Instruções de Operação descarregar pdf (Página 122)

Chapter 6 Operating Instructions

CLV490 Bar Code Scanner

Operation

6.5.4 Background teach-in

If the Autofocus function is used in the "Differential Background" or "Differential Background

and Tracking" mode, the CLV490 must first learn the ambient background in its reading

field to narrow the reading field even further. When the internal distance profile is set, the

reading field of the CLV490 must not contain any objects. In this mode, the CLV490 does

not output any reading results.

The Background teach-in function can be started as a device function via CLV490

(interactively), or press the [F2] key.

Line scanner with oscillating mirror:

In the "Background teach-in" mode, the CLV490 behaves in the following manner:

– in "Oscillating" mode (default setting: oscillating with a fixed amplitude), the CLV490

shuts off oscillation and positions the scan line under the angle CW = 50 (corresponds

to an angle of deflection below 105°). This position cannot be altered.

– in "One-Shot" mode, the CLV490 positions the scan line under the angle CW = 50.

– in "Fixed Position" mode, the scan line’s selected position remains unchanged.

Starting the background teach-in:

1. Mount the CLV490 at the reading station and align it with an object containing a bar

code.

2. Remove the object so that the CLV490 has an unobstructed view of the background.

3. Choose CLV490, D

EVICE FUNCTIONS, BACKGROUND, TEACH-IN

– or –

press the [F2] key.

The E

XECUTE DEVICE FUNCTIONS window opens.

Choose B

ACKGROUND, TEACH-IN in the EXECUTE menu.

The "Device Ready" LED extinguishes. The CLV490 then scans its background and

learns the ambient background so that it can create a suitable distance profile.

The CLV490 outputs a message once the teach-in procedure has been successfully

completed (see Fig. 6-11).

The CLV490 has then learned the ambient background.

Fig. 6-11: CLV-Setup: Dialog window for running the background teach-in

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SICK CLV490 Instruções de Operação Página 122