# Power chart interpolation fails

**URL:** <https://forum.inductiveautomation.com/t/power-chart-interpolation-fails/76886>\
**Category:** Ignition\
**Created:** [July 25, 2023, 5:00pm UTC](https://forum.inductiveautomation.com/t/power-chart-interpolation-fails/76886 "2023-07-25T17:00:45Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Pedro\_Jimenez](https://avatars.discourse-cdn.com/v4/letter/p/ecccb3/32.png) [@Pedro\_Jimenez](https://forum.inductiveautomation.com/u/Pedro_Jimenez)\
**Post date:** [July 25, 2023, 5:00pm UTC](https://forum.inductiveautomation.com/t/power-chart-interpolation-fails/76886/1 "2023-07-25T17:00:46Z")

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Hi,

When I graph a tag that has lost communication in Ignition, it shows values instead of cutting the graph. For example, during the weekend, we experienced a communication failure with a device, so we didn't record any data (in fact, there are no tables in the database). But when I graph the tag, I get some values displayed. I've noticed that this is due to interpolation, but I can't find how to deactivate it in the power charts.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/f/ef99de2afc9c833fbf65f4502a7477e8d3e5288e.png)

I've read about converting the inputs to Discrete, but with over 20,000 tags, it becomes a complex task. Is there another way to do it?

Thanks in advance.

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**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [July 25, 2023, 11:41pm UTC](https://forum.inductiveautomation.com/t/power-chart-interpolation-fails/76886/2 "2023-07-25T23:41:04Z")

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> [@Pedro\_Jimenez](#):
>
> there are no tables in the database

If this was the case, you wouldn't be recoding _any_thing _ever_ 🙂 do you mean there are no _records_ the database historic tables for these points during the comms outage?

To me, the interpolated line should not be there at all if the data is bad. I don't think discrete mode will fix that. I don't know off the top of my head how to fix it 🤔

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**Author:** ![lrose](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/lrose/32/62724_2.png) [@lrose](https://forum.inductiveautomation.com/u/lrose)\
**Post date:** [July 26, 2023, 1:45am UTC](https://forum.inductiveautomation.com/t/power-chart-interpolation-fails/76886/3 "2023-07-26T01:45:45Z")

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Personally, this doesn’t look like interpolation, rather it looks like the chart drawing the line between two points.

What is the value of `props.pens.display.breakline`?

From the manual:

> If true, the line will be broken on either side of bad/missing data values. If false, bad/missing data values are removed and the adjoining points are connected.

[https://docs.inductiveautomation.com/display/DOC81/Perspective+-+Power+Chart](https://docs.inductiveautomation.com/display/DOC81/Perspective+-+Power+Chart)

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<div class="post-metadata">

**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [July 26, 2023, 3:18am UTC](https://forum.inductiveautomation.com/t/power-chart-interpolation-fails/76886/4 "2023-07-26T03:18:10Z")

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> [@lrose](#):
>
> doesn’t look like interpolation

You're right