Encoder noise problems

I am using a 6602 card with a counter in a simple pulse generation mode, and a rotary magnetic encoder.
I am trying to send a pulse after the certain position change. we have a standard encoder, and we are using the 6602 card with a programmed single pulse train generation counter. A channel of the encoder is set as a source, and after 50 pulses it is suposed to give a pulse. The problem is however when the encoder due to some noise factor sends pulses without a movement. This is not a problem with a position measurement, as it also has B channel to detect the change of the direction.
Is there a posibility to restart the delay counter, while reading the AqB signal, without a involvement of the software program?

Hi Mirko,
I believe I understand your application now:
You want to count 50 pulses from your incremental encoder then generate a pulse output.
Right now it sounds like your are doing the following:
1. Using a counter on your NI 6602 to measure the angular position
2. When the position is reached that corresponds to 50 pulses then you turn a digital output high
3. Another counter on the NI 6602 is armed and waiting for a digital trigger, on receipt of the trigger it then generates a pulse.
It is not possible (that I know of) for a NI 6602 running a angular position task to generate a pulse output when a certain
position has been reached in hardware, this will need to be a software timed decision.
Why is the incremental encoder wired to the source of your counter?
I'm afraid this will always be a software timed event, the transition from measuring the position to generating a pulse (or pulse train).
This could be as fast as a millisecond if your VI was properly constructed.
If you need just a single pulse then why not use the software digital output to send a High then Low?
If you need a pulse train then look at the shipping examples that are included with Labview.
I'm attaching a quick example in Labview 8.2 that shows one concept that should work for you. This one count's edges then triggers a pulse train.
Have a great evening,
MatthewW
Applications Engineer
National Instruments
Attachments:
measureposition_counteroutput.vi ‏55 KB

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Well Harm, you are now official tech support for Macs too!!! (whether you like it or not
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