Real Time Simulation, problem with the 3D Lookup table

[Stefan207]

Hello,

I have a problem with LabVIEW RT. I want to read under the parameters of temperature, time and voltage, the current out of a matrix.

The matrices differ only in the temperature (first entry in a matrix).

If the 3D Lookup table only get one matrix, I often get "Not a Number" as result. But not always, although the parameters remain the same.

If the 3D Lookup table gets three or more matrices, the result never be "Not a Number". But the 2 other matrices are "dummys" filled up with zeros, expect the temperature. Also the problem appears only if I start the test sequence as Startup on the RT-System. If I start the test sequence from the Front Panel, the 3D Lookup table works well, whether one or more than three matrices!

Its confusing, I know ^^

The appendices contains pictures from a matrix an from the Block Diagram

[Salomon8]

Heyho,

I checked out your code, but from what I can see, I cannot tell where the problem occurs. For further assistance you'd need to explain your code a little further. You talked a bout a 3D Lookup table, which I understand, but I don't see where this table is produced in your code. For me it looks more like you have constants entering your VI which are then written into a file.

Please give some further hints - otherwise ther's no way that anyone can understand the meaning of your post

You're right... it is confusing 😉

[Stefan207]

Hello salomon,

The 3D lookup table is not generated in my code, but is invoked as a constant. I examine the behavior of electrical loads in the cars. Consumers were in a climate chamber measured at various temperatures and these values ​​were packed into a 3D lookup.

Helps you even further? : D