Process IO data from 9144 extension chasis on 9074 RIO FPGA

[ironeagle]

Dear Colleagues,

We have a 9074 RIO chasis and 9144 ethercat  extension. We can use the IO from 9144 extension chasis in scan mode but we also want to process the IO data from the extension chasis in FPGA mode on the 9074 RIO FPGA. Is this possible? Is it possible to process the data arriving from the ethercat by the FPGA on 9074 RIO ethercat master.

Best Regards,

ilhan

[jkurtw]

Hi ilhan,

It is not possible to access I/O modules in a 9144 directly through the 9074 master's FPGA.

This is because the I/O from the 9144 never physically passes through the FPGA on the 9074. It is acquired over the network cable, and brought directly into LabVIEW Real-Time memory. The local I/O on the 9074 is directly connected to the FPGA, so you have access to the I/O in the FPGA first.

Are you trying to access the 9144 I/O on the FPGA to get higher I/O rates or are you trying to offload processing to the FPGA?

You do have the option to acquire the 9144 I/O using scan mode, and then pass the data down to the FPGA for processing. However, this will not help you hit higher I/O rates.

thanks,

Kurt 

[J.Harv]

Ilhan--

    I'd be very curious to hear a bit more about your application and the use case (what you would use this for).  Perhaps either Kurt or I can help with an alternative architecture and/or it is always good for us to know a bit more about customer applications so we know if we have overlooked some functionality or just to see if there are improvements that can be made.  Please, let us know.

Regards,

John

CompactRIO Product Support Engineer

[jkurtw]

Hi ilhan,

Just in case you had not heard, with LabVIEW 2009 it is now possible to program the FPGA on the 9144 expansion chassis to preprocess, just like you were asking for 🙂 

Here is an intro: http://zone.ni.com/devzone/cda/tut/p/id/9288 

Kurt