What's the maximum counter frequency for the cRIO?

[YohanShminge]

Hi Everyone,

First of all, thanks for your input here!

I'm new to the cRIO, but have been working with LabVIEW for awhile.  I need to accurately measure the time between several digital inputs.  One input starts the counter, another captures and stores the current counter value, and a third stops the timer and also captures and stores the counter value.  It's basically a stopwatch.  The problem is that the counter needs to run at a frequency of 100Mhz or greater.  It also needs to be at least 28 bits wide so that it won't overflow between start and stop inputs.  Is this possible with any of the cRIO systems currently available?  If so, how?  I'm assuming it will need to be implemented within the FPGA, but does the FPGA run that fast?

Thanks so much!

-Yohan

[Kristen_K. · Accepted solution]

Hi Yohan,

Unfortunately, the cRIO is not capable of reliable frequencies at 100 MHz or greater.  I would recommend speaking with your local NI Field Sales Engineer or callteh NI Sales department at (888) 280-7645 to discuss the hardware that would accomodate your application.  

The PXI-6586Rmay be an option: https://www.ni.com/en-us/shop/model/ni-6585.html

I hope this helps!

Kristen H.

[YohanShminge]

Thanks, I figured that would be the case!  The product you mention looks interesting, but probably a little pricey in this case.  I may go with a completely separate FPGA system for this task...

Thanks again!

-Yohan