Help a Newbie with writing time and date to Measurement File

[YourAverageJoe]

I need help with taking data and showing current time and date on both a chart and writing it to a measurement file.

Essentially I am taking in data from an encoder that outputs data in amps. From here I taking that output current and converting it to a position value in inches. Then calculating velocity which would be outputted on a chart. However, I can't seem to show the current date and time. This VI is running separately over the network. I am using a NI 9207 module on a CompactRIO-9045

I have attached the Vi I am using which is on LabVIEW 2020.

Any assistance would be appreciated and since I am a newbie I might not have given you all the information you might need to help me but I can provide more if needed.

Thanks 

[RavensFan]

Your VI is missing.

[YourAverageJoe]

Sorry I thought I attached it.

[GerdW]

Hi AverageJoe,

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@YourAverageJoe wrote:

Then calculating velocity which would be outputted on a chart. However, I can't seem to show the current date and time.

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Technical solution to your question: convert the scalar FeedRate value into a waveform, then display the waveform in your chart. The chart will now allow to display timestamps on the x axis…

Your really should cleanup the VI:

• no sequence structure needed
• no need for ExpressVIs just to calculate some simple formulas
• why do you set a sample rate in your DAQmx task, when you limit the iteration speed of the while loop using a wait function?
• why do you read "N samples" when you only use one single sample per iteration???

[YourAverageJoe]

Thank you for the help.

Do you know a good way to save this information to the measurement file. I've been trying to find a way for it to save the time stamps as well as the data in like lets say 2 columns and have it presented nicely.

Any assistance would be great

[Yamaeda]

'Get Date/Time String' or 'Format into string' (if you want more control) will convert a timestamp to a string that you can write.

[YourAverageJoe]

How is that parameter pass through the write to measurement file express VI. Any help would be appreciated

Thanks

[GerdW]

Hi Joe,

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@YourAverageJoe wrote:

I've been trying to find a way for it to save the time stamps as well as the data in like lets say 2 columns and have it presented nicely.

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Then you need to provide your data as two columns (aka 2D array). Right now you only save a 1D array, resulting in just one columns…

Judging from your VI you should take the "Training resources" to learn LabVIEW basics (like data handling with correct datatypes)!

[YourAverageJoe]

Yes again I'm still learning and I believe I found some way of making it play nice. Thanks for the training resources.

Here is what I have after some time making my own revisions.

Let me know what you think.