Scaling

[LeeBowers1]

I would like to replicate 2 functions I use within SIemens TIA Portal regarding scaling

Normalise and Scale

I have an analog input, 0 to10V giving me 0 to 32767 - I would like this to give me a range of -20 to +80

Can anyone please suggest a way, Thank you

[GerdW]

Hi Lee,

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@LeeBowers1 wrote:

I would like to replicate 2 functions I use within SIemens TIA Portal regarding scaling

Normalise and Scale

I have an analog input, 0 to10V giving me 0 to 32767 - I would like this to give me a range of -20 to +80

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Generic math with function of 1st order:

y := a*x + b

You just need to determine the correct values for a & b to scale your input x (0…32767) to the desired output y (-20…+80)!

Hint:

b = -20
a = (y range) / (x range) = (80 - -20) / (32767 - 0) = 100 / 32767

How do you transfer the PLC raw data into your LabVIEW VI?

Do you even use a PLC or do you use a (NI) DAQ device?

With DAQmx you can even apply scaling (by ranges) to your AI channels, there's no need to determine a&b in this case!

[LeeBowers1]

Hello GerdW

Thank you for your email.

Your reply makes sense to me and it did seem more like a maths question rather than LabVIEW.

I did in in the interim ask chatGPT and it came back with a similar response as yourself.

Thank you

Lee

[NIquist]

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@LeeBowers1 wrote:

Hello GerdW

I did in in the interim ask chatGPT and it came back with a similar response as yourself.

Thank you

Lee

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I knew it! GerdW is AI. That explains a lot.  🤔

[paul_a_cardinale]

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@NIquist wrote:

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@LeeBowers1 wrote:

Hello GerdW

I did in in the interim ask chatGPT and it came back with a similar response as yourself.

Thank you

Lee

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I knew it! GerdW is AI. That explains a lot.  🤔

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That's quite an insult.  "AI" is misnamed; it should be called 'Artificial Stupidity'.