SICK CLV490 Instrukcje Operacyjne Pobierz pdf (Strona 106)

Chapter 6 Operating Instructions

CLV490 Bar Code Scanner

Operation

Explanation Internal object tracking

Internal object tracking can be used in autofocus mode with "Differential background and

tracking" mode or with event-controlled focus position switchover (e.g. by means of height-

control photoelectric switches at switching inputs "IN 0" to "IN 3"). If the reading pulse is

started via an external sensor, fast debouncing (≤5 ms) is used for the "Sensor" switching

input irrespective of the parameter settings. The CLV490 receives the signals from the

incremental encoder via switching input "IN 4". At a constant conveyor speed, the increment

can be triggered via an internal timer increment (100 Hz) (set the value for "Path per

increment encoder pulse" to 0), which means that an encoder does not need to be

connected to IN 4.

With object tracking, the reading field length corresponds to the distance in conveying

direction between the sensor for starting the reading pulse and the parameterized object

release point (see Fig. 3-5, Page 3-9). The focus release point is before the object release

point. The CLV490 uses the internal object management system and its object list to track

the objects passing through the reading field, whereby the object istance measurement

enables objects to be detected and the corresponding focus positions in the focus list to be

assigned. The increment management system continuously locates the current position of

the objects in the reading field in the conveying direction. The focus list acts as a circular

buffer, whereby the oldest entry determines the current focus position. If the CLV490

calculates that the end of an object being conveyed through the reading field has passed

the parameterized focus release point, the CLV490 switches to the next focus position and

deletes the object from the focus list. The reading result for an object is not output until the

object has left the object release point.

1. Parameterize internal object

tracking

– contd. –

Ö DEVICE CONFIGURATION tab

Ö ASSIGNMENT OF INPUTS section

Ö IN 4

– Conveyor increment

Note:

Connect external incremental encoder to "IN 4" switching input!

2. Define scanner position

referred to the reading field

Ö DEVICE CONFIGURATION tab

Ö SCANNER POSITIONS PARAMETERS button

Ö ANGLES section

– Angles: alpha, beta and gamma

Ö COORDINATES section

– x-, y- and z-coordinates

3. Teach-in background

(optional)

Ö Menu CLV490

Ö DEVICE FUNCTIONS

Ö Background

–Teach-in

Check taught-in background:

Ö READING CONFIGURATION tab

Ö AUTOFOCUS section

–S

HOW BACKGROUND button

Display actual background profile:

Ö Menu CLV490

Ö BACKGROUND ANALYSIS

Action Settings in CLV-Setup

Table 6-12: Guide: Parameterzing internal object tracking (contd.)

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 269 270

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