Wonderware Intouch Update HistTrend

[Apel]

Dear All,

We have Wonderware Intouch v10.1 running under Win Xp+Sp3. We have used real-time trend for each Analog tags (>200), and Historical Trends.

Now we have Historical Trend window which can be displayed in different display length like 24 hours,8 hours, 1 hour, 10mins and 1 min. This length value is assigned on button action.
We have also a button which is setting a memory Tag "TrendUpdate" and this tag is used in the Historical Trend screen as "window-script" while Window showing as follows:
IF TrendUpdate== 1 THEN
HistTrend1.ChartStart = ($DateTime * 86400) - HistTrend1.ChartLength;

So when I clicl update button my SuiteLink break and Hist data stop changing. Do you have any idea why this is happening?

 

[bjh]

Your Suitelink breaks?? Like, the communications to the PLC(s)? What driver are you using?

I have no idea why that happens. It's certainly not normal, you should contact WW tech support on that. However, to update the HistTrend in real time you can make a "While Open" window script every 5 seconds or so that does "HistTrend1.Update"

 

[Oakley]

Any reason you are not using WW Historian (previously InSql)?
The Historian functions and data are much more robust and can be used as a source of reporting.

 

[mhopley]

Check the update time on your while open windows script, it sounds like you are trying to update the trend too often.

 

[MartinW]

I just tried "histtrend1.update" in a window script and when I tried to validate the script I got the error "Undefined field name".

I don't want to use "HTupdatetocurrenttime" because I want the trend start time to stay the same, and for the trend to work its way across the screen.

If I exit the window and then go back in, the HT updates fine. Is there a simple refresh function which doesn't change the start time?

 

[presys]

Try the following link, which will show you how to update a historical trend start time:

http://www.scadadev.com/Content.aspx?PageID=27