# TimeSeriesChart, tag value not change , how to set ,let it show a straight line?

**URL:** <https://forum.inductiveautomation.com/t/timeserieschart-tag-value-not-change-how-to-set-let-it-show-a-straight-line/97700>\
**Category:** Ignition\
**Tags:** perspective\
**Created:** [October 24, 2024, 2:42am UTC](https://forum.inductiveautomation.com/t/timeserieschart-tag-value-not-change-how-to-set-let-it-show-a-straight-line/97700 "2024-10-24T02:42:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![taohongyu88](https://avatars.discourse-cdn.com/v4/letter/t/f05b48/32.png) [@taohongyu88](https://forum.inductiveautomation.com/u/taohongyu88)\
**Post date:** [October 24, 2024, 2:42am UTC](https://forum.inductiveautomation.com/t/timeserieschart-tag-value-not-change-how-to-set-let-it-show-a-straight-line/97700/1 "2024-10-24T02:42:19Z")

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In Perspective TimeSeriesChart, tag value not change , how to set ,let it show a straight line?  
Tag SV - IN two minutes not change ,always equal 67.  
But in chart ,it shows not a straight line.  
How to set its property?

TimeSeriesChart display:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/2/5218e81cc5de97d41446fdc7cf4422a93d828149.png)

TimeSeriesChart Binding:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/6/668d620052e7645d0f73d258a6a32efbaf8996d8.png)

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/5/e5750c06d147ba7875b36328faee3bc4d9b5a1a1.png)

Tag history setting:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/5/25751a879c10754d4768bdda65ee75f1596e25eb.png)

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<div class="post-metadata">

**Author:** ![martin.johansson](https://avatars.discourse-cdn.com/v4/letter/m/7feea3/32.png) [@martin.johansson](https://forum.inductiveautomation.com/u/martin.johansson)\
**Post date:** [October 24, 2024, 4:59am UTC](https://forum.inductiveautomation.com/t/timeserieschart-tag-value-not-change-how-to-set-let-it-show-a-straight-line/97700/2 "2024-10-24T04:59:32Z")

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Try setting "Deadband Style" to "Discrete". This will only work with the new data that is saved after the change.

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<div class="post-metadata">

**Author:** ![taohongyu88](https://avatars.discourse-cdn.com/v4/letter/t/f05b48/32.png) [@taohongyu88](https://forum.inductiveautomation.com/u/taohongyu88)\
**Post date:** [October 24, 2024, 8:22am UTC](https://forum.inductiveautomation.com/t/timeserieschart-tag-value-not-change-how-to-set-let-it-show-a-straight-line/97700/3 "2024-10-24T08:22:01Z")

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Yeah, Thank you !  
Tag Hisotry Deadband Style set to Discrete: The value will not be interpolated.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/d/2daa557cc17a7a2173068b9a444c75400433b8ec.png)

The deadband will be applied directly to the value. That is, a new value (V1) will only be stored when: |V1-V0| \>= Deadband.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/5/a5cccffbb3e3e9665cf6a52f94a928cfc1606a88.png)

[Docs](https://docs.inductiveautomation.com/docs/8.1/ignition-modules/tag-historian/configuring-tag-history)