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Image processing
4.4 Options for image acquisition and image processing
4.4.1
"Single trigger" image acquisition option
How it works
With this setting, one image is acquired per trigger followed by one read.
If several objects need to be acquired in a very short time, acquired images can be buffered
before they are processed.
Up to 50 objects can therefore be acquired at an image frequency of more than 80 images
per second and then processed (SIMATIC MV440 SR models at half resolution).
To allow this, the images can be buffered and the image buffer size can be selected:
● SIMATIC MV420 can buffer 15 images.
● SIMATIC MV440 SR and SIMATIC MV440 HR can buffer 50 images.
● SIMATIC MV440 UR can buffer 30 images.
The reader transfers the results of the reads as soon as it has processed them.
"Image buffer size 1" setting
If the image buffer size is set to the value 1, this mode corresponds to a sequential
processing chain of trigger ➜ image acquisition ➜ processing ➜ result transfer. The next
trigger comes only after processing is completed.
Trigger
Image
acquisition
Decoding
Transfer of
results
Figure 4-15
86
Trigger interval
Cycle time
Time diagram of option single trigger for image buffer size 1
Cycle time limit
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
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