LabVIEW
For "Select" module, how can I return nothing if s is false?
It's a full circle. I just followed what you said, I set the output tunnel of case structure as "use default if unwired", but it will return 0 not empty when the case is false.
@yatang wrote:
But I'm still not very understand what's the function of the feedback node. Why you keep the latest value? In my understanding, case structure will select the header, then put the data into corresponding array right?
You do not want your other value to just reset to 0. That would completely mess up your data logging and/or display. So the feedback node keeps the latest values of your channels. So in the case structure, you just update the channel values you recieved.
I said to do the conversion to string inside the case structure, so you'll get an empty string out.
It might be better to use a defined value string e.g. "missing" for clarity.
If you want to stick with the numeric, use some special value to indicate missing data (e.g. -999 or whatever cannot occur normally).
I still think that you are overenginering things. You have three charts and if each only updates when valid data arrives, their x-axes gets out of sync very quickly, confusing the operator. A better way would be to send a NaN to the chart, interrupting the curve for the duration of the outage.
OK I understand you. And will the feedback node repeat the correct data for three times?
By the way, could you please help me modify the code? I cannot find some functions in the labview. Just like the functions inside the case structure as you shown in the previous figure.
WOW, it is so fancy!
But CrossRulz's labview version is later than mine. Hi RavensFan can you open that code? If you can, could you please convert it to version 12.0
