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Image processing
4.4 Options for image acquisition and image processing
4.4.2
"Auto trigger" image acquisition option
How it works
With this setting, codes entering the viewing field of the reader are read automatically. In this
case, the reader does not require any external trigger signals, for example from a light
barrier.
This option is particularly suitable for the following objects:
● Objects with which precise triggering using a light barrier is difficult.
The monitoring frequency with which the reader monitors the viewing field can be higher
than 90 Hz, for example SIMATIC MV440 SR with half resolution and good DMC quality.
The "Auto trigger" option operates in time with the steps. The acquired images are decoded
in the same clock cycle. The "Auto trigger" option can therefore be used continuously without
time limits.
To optimize the power used by this function, the monitoring can be started by an initial
trigger and can then terminate itself after a selectable time or a falling trigger edge.
Trigger
Image
acquisition
Decoding
Transfer of
result
Figure 4-17
88
Acquisition interval
Acquisition interval
Time diagram of the Auto trigger option
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
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