Why can't it count edges-Error -200141

I'm using a very precise shaft quadrature encoder with 400 pulses per revolution. I'm simply trying to test it before I incorporate it into my VI. I've been using the DAQassistant to try and configure it. I've got a PCI-6036E with a BNC-2120 accessory. To start I hav been just trying to read an edge count of one of the channels. In this case I'm reading from CTR 0 Gate. When I try to run the edge count test as soon as I move the shaft at all I get an error(Error -200141).
It says I should try using DMA. I've looked into this and everything I have found appears to indicate that the PCI-6036E has "dma", however I have been unable to identity if it is being used or not.
Is my DAQ simply not capable of reading this fast of a signal?

Hi Erik!
How quickly are the counter events occurring? The counter source frequency of that card is 20MHz which should be able to keep up with a quick signal.
I see you found the knowledgebase article that references this particular error code (found here). The solutions mentioned there are worth looking at.
The PCI-6036E only has one DMA channel available to it. So if you are only using one channel, DMA is being used by default. Any other channel that is being used at the same time is then defaulted to interrupts.
If you would like to be sure that your task is using DMA, you can include a property node to force the channel to use DMA (still, only 1 channel can use it at a time). See the attached image on how to access that property.
Also, be sure that you are not doing too many operations within the loop that is reading this data. That way the software can pull the data off the buffer as fast as possible.
Peter E
Applications Engineer
National Instruments
Attachments:
DMA Counter.png ‏17 KB

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Hi all,
First .. I'm a beginner with LabView and I hope to explane myself in good way cause I'm italian..
I red all the post about the error 200141 and check the suggested solutions (also the way to ignore the error), but I want try to ask for a differet one..
What i'm trying to do is to aquire 6 encoder, 3 on the first board PCI 6602 and 3 encoder on the second board on DMA channels.
The encoder generate 90000 X4 = 360000 pulses x revolution and the max speed rotaion is 4 RPs.
Cause I need to store in a bin file all the pulses from the encoders, i generate a trigger of 1.5 MHz to get all the samples at the max system speed (360000 * 4 = 1440000 pulses x sec).
I think to have reached the limit, and maybe is not possible do better.. actually the 2 PCI 6602 works with 1,0 MHz of trigger and the system store in 6 files 4000000 of samples during
the finite measure of the angular position on 6 channels.
The trigger is not yet sync between the 2 PCI cause I'm waiting for a RTSI cable to put in the PC...
In Your opinion is possible to find a alternative way to acquire these encoders ?..
Thanks

I also doubt if you need to capture every single increment from each encoder. I'll discuss this more below.
Further, many earlier discussions suggest that counter tasks can sustain data transfers merely in the 100's of kHz, with *maybe* a possibility under special circumstances to slightly exceed 1 MHz. Your boards have very small hardware buffers (either 1 or 2 samples worth), causing the PCI bus usage to be very frequent and therefore less efficient.
Now, let's go back to your sample rate. You've got encoders which suggests that you're dealing with a physical system. Physical systems have inertia, which limits their useful bandwidth. In my experience, it's quite unusual to care about motion artifacts beyond the 10's of kHz. The inertia just doesn't allow anything significant to happen at that rate.
So, if the physical bandwidth of your motion system is, say, 5 kHz, there's a rule of thumb suggesting to measure at 10x when possible. So that'd mean 50 kHz sampling. 50 kHz x 6 channels on the PCI bus may be possible. Multi-MHz sampling won't be.
Can you describe the physical system a bit?
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