Sparkline with Tag Historian binding showing in designer but not in session

Ignition
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1

Like the title says, I’m trying to get a sparkline in a Perspective view. The line is showing in the designer but not in a session (Chrome or Firefox). I tried closing the view, reopening it, closing the designer, and other things to try to make the spark disappear in the designer, but it remains. I also tried to refresh my session, clear cache, reboot the server, and I couldn’t get the spark to show up. What I do know is that if I disable the Tag History binding and keep the 50 points in the dataset, I’ll get a line in the designer AND in the session.

I have a Tag History binding type defined on the points dataset of the sparkline.

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As you can see, what is different (v8.1.14) is that I’m using an expression for the tag definition. Here is the key that’s displayed in the snip:

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I set up this structure according to the docs here.

Any ideas why this is happening?

2

The setup looks accurate. I just replicated it and it works as expected in a Session (albeit on version 8.1.13).

I would recommend checking the “Enabled” box on the Binding itself.

I would also recommend scrutinizing the “path” property since it has a binding. The binding on it perhaps isn’t returning what you expect in the Session. You can add a label component and bind the label text to that property - to ensure it is a valid tag path in the Session.

3

The problem was that I wasn’t specifying the tag provider (i.e. [default]) in the tag path. I should’ve caught this earlier. Thanks @kvane!

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