Comparison with Units

[Andrewclark219]

I'm trying test if the number that is input is greater than 0, however, because I attached a unit to the control the comparison is not allowing me to connect the wires. Is there a way to strip the unit off to do the comparison or is there another way I can do a comparison with a value that has units associated with it.

Thanks

[altenbach]

We can help better if you attach the VI instead of a truncated picture.

[pulidotech]

You can remove units using the Convert Unit function.  This article will probably help:
https://www.ni.com/docs/en-US/bundle/labview-api-ref/page/errors/unit-conflict.html

In your case, I believe you would add the Convert Unit function before the greater than 0 comparison. Enter "m" into the function and that will remove the units.

[rolfk]

Another option is to use an equal operator with the other input wired to a compatible constant!

[RavensFan]

Is there a reason you are even using units?

Units are a feature that NI added to LabVIEW years ago but there are so many quirks to them that the hassle outweighs the benefits.

[altenbach]

As Rolf already hinted the "zero" in ">0" does not have units so the comparison is not allowed for you sanity. Imagine you have a temperature, would 0 to be compared be in kelvin, fahrenheit or celsius? The program cannot know!

Yes, compare with a zero in the correct units instead. If you just remove units, you might not get what you expect.

[paul_cardinale]

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@RavensFan wrote:

Is there a reason you are even using units?

Units are a feature that NI added to LabVIEW years ago but there are so many quirks to them that the hassle outweighs the benefits.

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I disagree.  There are some quirks, but overall, I find units useful.  I use units on a control that represents a physical quantity and is on the connector pane.

[billko]

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@paul_cardinale wrote:

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@RavensFan wrote:

Is there a reason you are even using units?

Units are a feature that NI added to LabVIEW years ago but there are so many quirks to them that the hassle outweighs the benefits.

---

I disagree.  There are some quirks, but overall, I find units useful.  I use units on a control that represents a physical quantity and is on the connector pane.

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I use units when I want to concentrate more on the manipulation of the data than what the data actually is.  For instance, if I'm using a formula that involves Hz, I don't want to worry what the incoming number is.  If my formula uses Hz and the incoming number represents GHz, I add the appropriate unit and that's that.