00196625-03_AI_SX12_PCB_Barcode_de_en.pdf - 第188页

Setting up and Commissioning Configuring the PCB Barcode Scanner 2D PCB Bar code Scanner 188 PCB Barcode LP-Barcode ► Go to Timeout and enter the maximum time after w hich searchin g should be ter minated, if the sys - t…

Setting up and Commissioning

2D PCB Barcode Scanner Configuring the PCB Barcode Scanner

PCB Barcode LP-Barcode 187

"Light and Camera Settings" view

► Set the Trigger-Type to Burst (external).

► Go to Burst length and enter a value of 22 for the maximum number of images to be recorded.

► Go to Interval and specify the time interval between the individual images.

A practical starting value for the interval is 40 ms and an advisable time range is approx. 30...80 ms.

If the code is always in the middle or rear part of the board, the start of image recording after the trigger

signal ( = when the conveyor switches on) can be delayed using the setting Trigger delay, so that the

image recording only begins when the code is just in front of the reading window. As a result, the image

memory available (burst length) is used specifically for the area of the board which contains the code.

This means that, even on longer boards, a longer code can be read than would be possible without the

Trigger Delay function. The default value is 200 ms.

► Go to Maximum exposure and enter a maximum exposure time of 1/2000 s.

A longer exposure leads to fuzziness, caused by the speed at which the board is inserted. Codes

with small cells (e.g. 10 mil) require an even lower maximum exposure.

NOTICE

The reader records 22 images in burst mode after receiving the trigger signal (= burst length)

with the image rate 1/interval time. A longer interval time enables you to search for the code

over a greater area on the board currently inserted. however, the overlapping of two consecu-

tive images is reduced so that only codes with smaller dimensions can be read. For reliable

reading, you need to make sure that the complete code is present in at least two images. This

means that larger codes require a greater overlapping of the individual images, which can only

be achieved during constant conveyor speed by setting a shorter interval time between the in-

dividual images.

Setting the interval time is always a compromise between the required scan length on the board

and the maximum code size which can be read.

Setting up and Commissioning

Configuring the PCB Barcode Scanner 2D PCB Barcode Scanner

188 PCB Barcode LP-Barcode

► Go to Timeout and enter the maximum time after which searching should be terminated, if the sys-

tem is unable to find a code in a single image.

The time required to find a code depends greatly on the quality of the code or image recorded and

on the amount of interfering structures in the image (e.g. circuit paths on the board). The default

Timeout value is 100 ms.

Testing the settings

You can now check the settings in the Result Display view. The scanner will execute the number of im-

ages specified in the Burst Mode Settings and will then show its results at the top and bottom of the win-

dow.

Image recording is terminated prematurely as soon as a code is found in the image.

► Change over to the Results Display view.

Results display view - manual trigger

► Position the code in the scan window between the two green luminous markings.

► Click on the Trigger button (1), to manually trigger the image recording.

► Use the image shown and the data string to check whether the code has been read properly.

If successfully read, a green frame will appear around the code.

► Enable the Live Display enabled option, if required.

This makes it easier to position the code in the scan window. However, image assessment is not

performed.

The code should appear vertically positioned, roughly in the center of the image. You may need to adjust

the Y position of the scanner by a few millimeters.

If the scanner is unable to read the code, due to a mirrored PCB surface, adjust the angle of the scanner

in its holder.

The data string transmitted to the conveyor control is shown underneath the image.

Setting up and Commissioning

2D PCB Barcode Scanner Configuring the PCB Barcode Scanner

PCB Barcode LP-Barcode 189

You can also set the scanner to the current code type by clicking on Train code. This achieves the max-

imum operational reliability. The button will then switch over to Untrain code.

If there are several different codes on a board, Train code can be used to select the required code. The

other code types will then be ignored and not scanned.

If you later need to switch over to scanning another code, first cancel the existing setting by clicking on

Untrain code.

Saving settings

► The settings can be permanently saved on the barcode scanner at System --> Save Settings.

For more information, refer to the help function shown on the right.