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Thread: XY Trends

  1. #1
    hansvanzijp Gast

    Default XY Trends

    Hello,

    With an XY trend there is always the risk that the plot area is filled up, new points are drawn, old ones are not deleted.
    I tried to avoid that by setting the time filter in the screen switch on relative, for example on 1 minute.
    But then the old points are not deleted, so the problem still exists.
    As a workaround I found the possibility to use online vars, with the HD-data storage on 1 minute.
    Then with a screen-switch every minute I get what I want.
    But with data from an archive thatís not working, after a new screen switch much more data is displayed as defined in the screen switch function.
    I tried to shorten the save cycle for the archive, but thatís not helping and giving weird display results.
    What is a solution for this?

  2. #2
    Join Date
    01.07.2008
    Location
    Salzburg, AT
    Posts
    831

    Default Re: XY Trends

    In the XY Trend old data points are not deleted automatically by refresh rate. This is a question of definition; a discussion about is open.

    You could use periodical call of screen switch function - to redraw the trend periodically, e.g. trigged by limit of a MATH driver 'counter' while screen is open (so MATH variable calculated from an internal 'Screen active variable'; where MATH counter has limit - script call: resetting counter value and opening the screen again).

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