topic Re: Field point scale? in FieldPoint Family

Field point scale?

the_sun — Wed, 23 Jun 2010 14:59:23 GMT

Hello all,

I need to make a *.vi where a user can edit the scale of the Field Point Channels easily.

That means read the current scale, edit and then save it.

MAX should not be used.

HW used: FP 112, Ethernet

Thanks

Re: Field point scale?

Justin_P — Thu, 24 Jun 2010 21:30:29 GMT

By scale, I assume that you mean range. And while I'm not sure if you will be able to read the current range you can set the range using the Configure Range.vi from the FieldPoint palette.

Hope this helps.

Re: Field point scale?

the_sun — Fri, 25 Jun 2010 05:42:11 GMT

Hello

Justin_P, thanks for the replay. But, this is not what I was looking for. I need to change the scaling (Slope and Y-Intercept).

For example: MAX->Data Neighborhood->FieldPoint Items->FP-AI-112@2->Channel 0->Scales.

I need that a non-experienced user can use my *.exe, and change the scaling. Then this change is remembered in the project *.iak file.

Can you help me?

Thanks

Re: Field point scale?

AnalogKid2DigitalMan — Fri, 25 Jun 2010 18:28:31 GMT

Use the basic math operators of add and multiply, add your offset (b) and use multiply for slope (m).

Y=mX+b

Or I think there is a linear interpolation function in one of the pallettes.

-AK2DM

Re: Field point scale?

AnalogKid2DigitalMan — Fri, 25 Jun 2010 21:12:03 GMT

the_sun:

See attached code I have used before.

-AK2DM

Re: Field point scale?

the_sun — Mon, 28 Jun 2010 09:10:44 GMT

Hello So, I have done something similar, but this solution does not solve my problem. I need that the changes are read/saved from/to the *.iak file. Something similar to DAQmx, where all the changes for each channel, task or scale, made in some *.vi, are saved in MAX Have a nice day

Re: Field point scale?

Justin_P — Mon, 28 Jun 2010 23:29:21 GMT

I would take AK2DM's suggestion and then save the m's and b's to another file that you make on your controller, called something like scales.ini. I wouldn't suggest trying to modify the .iak file to include your scales.

If you could explain to me why you need the scales to show up in MAX, maybe I would better understand your problem and be able to provide a different solution.