Balluff MATRIX VISION mvBlueNAOS, Техническое руководство

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1.18 Use Cases 181
2. Build flash signal with Timer ,
3. trigger Timer with external trigger (e.g. "Line5" ).
4. Use "Trigger Delay" to delay exposure of the sensor accordingly.
In wxPropView (p. 65 ) it will look like this:
Figure 5: Working with Timer and "Trigger Delay"
1.18.4.2 Creating a debouncing filter at the inputs
In some cases, it is necessary to eliminate noise on trigger lines. This can become necessary when either
• the edges of a trigger signal are not perfect in terms of slope or
• if, because of the nature of the trigger signal source, multiple trigger edges are generated within a very short
period of time even if there has just been a single trigger event.
The latter one is also called bouncing .
Bouncing is the tendency of any two metal contacts in an electronic device to generate multiple signals as the
contacts close or open; now debouncing is any kind of hardware device or software that ensures that only a single
signal will be acted upon for a single opening or closing of a contact.
To address problems that can arise from these kinds of trigger signals MATRIX VISION offers debouncing filters at
the digital inputs of a device.
The debouncing filters can be found under "Setting -
>
Base -
>
Camera -
>
GenICam -
>
Digital I/O Control -
>
LineSelector" (red box in Figure 1) for each digital input:
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