How to creat variable

[Chathuac98]

I am very beginner to labview and i want to creat variable which get value 1 when input get 1 and not change when input 0 .

[GerdW]

Hi Chathuac,

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@Chathuac98 wrote:

I am very beginner to labview

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As a "very beginner" you should start with all those Training resources offered at the top of the LabVIEW board…

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@Chathuac98 wrote:

i want to creat variable which get value 1 when input get 1 and not change when input 0 .

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All you need is a while loop (as your input may vary over time), a shift register (your "variable", as LabVIEW uses wires and shift registers instead of "variables") and a case structure (input may be 1 or 0)…

What have you tried and where are you stuck?

[altenbach · Accepted solution]

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@Chathuac98 wrote:

I am very beginner to labview and i want to creat variable which get value 1 when input get 1 and not change when input 0 .

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In LabVIEW, the wire is the variable., you can branch the wire to an indicator if you want to also display it to the user. 😄

If you simply don't want to update an indicator, place it in a case structure and execute an empty case if zero happens, else update the indicator. If you also need the value elsewhere, keep it in a shift register or feedback node across iterations.

In addition, you really need to define the problem better.

• Where does the "value" come from?
• Where does the "input" come from?
• Is "input" the same as "value" or different?
• What causes "it" to change? How often?
• What are the starting values? For example if the input is always zero, there is no obvious value to retain.
• Are these integers or floating point values?
• What should happen is the input is neither 0 or 1 (e.g. -1000, 34567, Pi, NaN, etc.)
• etc.

[Yamaeda]

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@Chathuac98 wrote:

I am very beginner to labview and i want to creat variable which get value 1 when input get 1 and not change when input 0 .

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So, it'll be Off until activated and then always True. A shift register and an Or can fix that.