cRIO 9076 HAVE sampling problem

Hello

I have a question about the NI 9223 samping rate in our 9076 cRIO system.

Given that hopefully samping at a rate up to 500 K or 1 M, we are now using the user controlled sampling I/O.

Right now, we are sampling 500 k (2). But I got a number of cycles of 99 graduations (about 2.5us) for sampling only node.

Should I wait so many ticks for block sampling? I did all this trouble?

Thank you very much!

Hi hang up,

Looks like you're indicating the rate of loop for the entire while loop, in that you and not just a specific part of the code.  Because you have your loop timer, controlled by a front panel object, it is possible that compiled code, but if you change the time of the loop to a low value, the code cannot complete in time.  I suggest that you conclude the acquisition you are trying to do in his own loop so that it can operate at full speed.

In addition, in order to obtain the complete acquisition of MECH. / s, you're going to need architecting your acquisition.  I encourage you to check the code example in our search for the NI 9223 user controlled II example a composition for the best way to get these maximum acquisition rate.  In addition, depending on how you're going to export these data from the FPGA, your controller ART may not be able to handle a throughput of MECH. / s.

To answer your question specifically, I suspect that because you try to make a wide loop in a short period of time, the FPGA cannot complete the task in time, so it uses by default a rate that can be better managed.  For the control you are looking for, I encourage you to move your application to architecture in the sample project to get the behavior you want.

Tags: NI Software

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