HyperTrend show trend line with bug

[wildnsk]

Hello
I have HMI system where I use Labview 2012 with DSC. When i use HyperTrend from DSC tool pallete and show trend from historical database Citadel, i find some abnormal work in programm. Trend line showing with bug:
Extrapolation trend line for data live time not redrawed and scrolling with interpolated hystory trend timeline. If i click mouse on plot all showed line trend redrawed, but next time again show trend line with bug.
If i set zero deadband for variable trend and save information fastest in database this bug not show. But for my work need big time trending depth and it not good variant.
Please help find solve my problem. Maybe HyperTrend have some hiden properties for redraw?

[JoeySpinella]

Hi Wildnsk,

Can you please clarify the conditions that cause this bug to appear?

You said that with a 0% deadband and save the information fastest (what does this mean?) you don't see this bug?

What settings consistently reproduce this error?

Is there LabVIEW code you can send that reproduces this error?

[wildnsk]

Hi
When I set 0% deadband logged data save in database with high frequence rate. In this instance trend line redraw fast, bug extrapolate line short and almost invisible. In project with HyperTrend ActiveX not used any additional code, only trend's configure and DSC setting for Citadel database. Now i find optimal deadband and variable resolution for minimize bug visible and database information volume.
I think NI may fix it bug in HyperTrend add option timer for trend line redraw?

[JoeySpinella]

Does this problem only persist when viewing the data in real-time as it is coming up? It is an issue with the rendering of the trend lines showing line artifacts?

[JoeySpinella]

I have set up a basic program that writes data at 10 Hz to a citadel database and displays it on the hypertrend control. I don't see this issue with the horizontal lines. What frequency is the data being written to citadel at? Am I missing something?

[wildnsk]

Now I'm on a business trip at the site where the automated system is working. Unfortunately I am unable to send you a project because without of hardware that use a lot of cRIO controllers it makes no sense. I write to you late!

[wildnsk]

P.S.

Frequency is the data being written to citadel non-constant value which depends on the dynamic characteristics of the signal and its forms. The frequency of witing in the database in the first place affect the parameter deadband in module DSC and second place the parameter varable resolution.

[JoeySpinella]

Hi Wildnsk,

Please help me understand how I can reproduce this using cRIO controllers writing to citadel. Is there a way this issue reproduces with a simulated signal such as a random noise generator? In this way you could send me a project that I could run on this end so that I could report this as a bug.

Looking into the Hypertrend ActiveX control, I can see in the Property Browser that we have properties for ImmediateUpdate and SynchWithData, but we do not have a property to configure how frequently it updates (redraw, as you suggest).