# Uncertain\_InitialValue on only 1 tag group **URL:** \ **Category:** Ignition\ **Tags:** ignition81\ **Created:** [May 2, 2025, 4:29pm UTC](https://forum.inductiveautomation.com/t/uncertain-initialvalue-on-only-1-tag-group/105833 "2025-05-02T16:29:14Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![jparsons](https://avatars.discourse-cdn.com/v4/letter/j/ea666f/32.png) [@jparsons](https://forum.inductiveautomation.com/u/jparsons)\ **Post date:** [May 2, 2025, 4:29pm UTC](https://forum.inductiveautomation.com/t/uncertain-initialvalue-on-only-1-tag-group/105833/1 "2025-05-02T16:29:14Z")
Hello, I am setting up a new Rockwell PLC (ControlLogix V35). I have one tag UDT where some of its values are showing up fine and some of its values are showing up as Uncertain\_InitialValue. This is the only tag that is doing this. I've read about the PLC being idle but with all of my tags working aside from this one I don't think that is the case. It doesn't seem to be the Ignition version (8.1.4) or Rockwell PLC version (V32) where this was common. Does anyone have any other solutions? ---
**Author:** ![code\_skin](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@code\_skin](https://forum.inductiveautomation.com/u/code_skin)\ **Post date:** [May 2, 2025, 4:31pm UTC](https://forum.inductiveautomation.com/t/uncertain-initialvalue-on-only-1-tag-group/105833/2 "2025-05-02T16:31:12Z")
Make sure the UDT members have the correct external read/write access applied. ---
**Author:** ![jparsons](https://avatars.discourse-cdn.com/v4/letter/j/ea666f/32.png) [@jparsons](https://forum.inductiveautomation.com/u/jparsons)\ **Post date:** [May 2, 2025, 4:43pm UTC](https://forum.inductiveautomation.com/t/uncertain-initialvalue-on-only-1-tag-group/105833/3 "2025-05-02T16:43:45Z")
I got it. The tag groups were incorrect.