"XNode is not executable" with butterworth filters

[metso]

hi,

I created a service request on this issue over a week ago but still got no response from NI. So I try this way to see if anybody else noticed similar behavior.

I am fairly new to Labview. I need to remove DC offset from a signal (I'm using RIO evaluation kit with sbrio9636 base board, and Labview ver 2013). A similar operation is being done in a sine wave synchronization example design, found here:
https://decibel.ni.com/content/docs/DOC-25022

I started my design from scratch and then added a similar butterworth filter as used in the example design. Labview gives me an error "XNode is not executable". Then I noticed that I get the same error even with the example design, by doing the following:
-download the zip file and unzip it
-open the project BYOES Tuner Example.lvproj
-browse the project explorer to open FPGA.vi
-in the block diagram, open the leftmost Tune block of "Read AI Channels and
Update AO Channel" while loop
-in the block diagram of that Tune block change to edit mode by pressing CTRL-M. there are two butterworth filters applied after AD converting analog inputs. double click on either of these filters to see filter settings.
-change Cutoff frequency (Hz) from 10 to 1k. then change it back to 10.
-now the run arrow turns grey, saying "XNode is not executable".

What's wrong? How can I create a butterworth filter using cutoff freq of 10 (Hz), without getting such error?

regards,
mikko

[Finland_]

Hi Seppo!

I tried to to reach you regarding with this case. I wanted to ask you more about the VI that you told. Which one of them is the leftmost Tune block of "Read AI Channels and
Update AO Channel" while loop? Can you give us a picture of that?

BR,

Make Nguyen

NI Finland Technical Support.

[metso]

hi,

Here's the picture:

mikko

[Finland_]

Hello Mikko!

I tried to replicate the problem that you got but with no success. I don't get any errors. Can you check what LabVIEW version do you have? Please Open your LabVIEW >> Help >> About LabVIEW. I will write you an email and do the support via normal process.

BR,

Make

[Finland_]

yes we saw when opening Butterworth Filter to LV, there will be an error as Mikko mentioned earlier: "XNode is not executable" but putting that inside an subVI, it will work. I dont know how and why this is happening, I guess that this is a bug that we need to fix. I will ran a series of test more and create a CAR if none is done yet. Please use the work around by putting the filter inside an subVI.

BR,

Make