# Graphs and Tables not showing data

**URL:** <https://forum.inductiveautomation.com/t/graphs-and-tables-not-showing-data/18169>\
**Category:** Ignition\
**Tags:** ignition79\
**Created:** [May 25, 2018, 2:37pm UTC](https://forum.inductiveautomation.com/t/graphs-and-tables-not-showing-data/18169 "2018-05-25T14:37:05Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![harryzhou4498](https://avatars.discourse-cdn.com/v4/letter/h/71c47a/32.png) [@harryzhou4498](https://forum.inductiveautomation.com/u/harryzhou4498)\
**Post date:** [May 25, 2018, 2:37pm UTC](https://forum.inductiveautomation.com/t/graphs-and-tables-not-showing-data/18169/1 "2018-05-25T14:37:05Z")

</div>

I am trying to show a value for voltage on a graph. The tag is attached to an OPC tag that reads values from a PLC. I’ve tried dragging the tag into the graph, but I can’t seem to get anything to show on the graph even though the value is clearly changing in the tag. The value in question is shown by I:0\_4 in the image.

 ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/6/6c6b64461f5d30a3d2b6df7e2ad4f0199a763fc3.PNG)

---

<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [May 25, 2018, 7:06pm UTC](https://forum.inductiveautomation.com/t/graphs-and-tables-not-showing-data/18169/2 "2018-05-25T19:06:17Z")

</div>

Did you enable history for that tag? You can’t graph if you don’t record.