Siemens SIMATIC MV500, Руководство по эксплуатации, Страница: 88 / 294

Image processing
3.4 Options for image acquisition and image processing
SIMATIC MV500
88
Operating Instructions, 03/2021, C79000-G8976-C494-05
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 Trigger initiates the operation.
② Trigger signal is ignored.
a Image acquisition time
b Image acquisition interval
c Limit of the decoding time
No code found.
Code found.
Figure 3-22 Time diagram: Scan with multiple trigger signals