Scan" Image Acquisition Option - Siemens SIMATIC MV500 Operating Instructions Manual

Image processing
3.4 Options for image acquisition and image processing
3.4.3

"Scan" image acquisition option

How it works
With this setting, the optical reader is suitable for scanning codes located, for example, on a
rotating axle.
In contrast to the "Auto-trigger" option, acquired images can also be buffered and processed
later. Only one code is read per trigger signal. The code must be fully visible in one of the
acquired images.
If a code cannot be decoded in any of the acquired images, an "N_OK" read is output.
With the default settings, with first read success following triggering, the read result is output
and further processing of the scan sequence is exited. Using the "Settings > Communication >
Extras > Program sequences" function, you can change this reaction as follows:
• All configured image acquisitions are taken and processed by selecting the result output
"Best read result". Following this, the qualitatively best read result is output.
• If you select "All read results", all the configured image acquisitions are taken and
processed, and all successfully processed image acquisitions are output.
By using the "Edge-triggered start/stop" option, you can adapt the image acquisition
sequence dynamically to your process using a trigger signal.
①
②
a
b
c
Figure 3-22
88
Trigger initiates the operation.
Trigger signal is ignored.
Image acquisition time
Image acquisition interval
Limit of the decoding time
No code found.
Code found.
Time diagram: Scan with multiple trigger signals
Operating Instructions, 03/2021, C79000-G8976-C494-05
SIMATIC MV500