# Tag Uncertain\_LastKnownValue **URL:** \ **Category:** Ignition\ **Tags:** ignition81\ **Created:** [July 15, 2026, 5:04pm UTC](https://forum.inductiveautomation.com/t/tag-uncertain-lastknownvalue/116423 "2026-07-15T17:04:00Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![schmidtf](https://avatars.discourse-cdn.com/v4/letter/s/5daacb/32.png) [@schmidtf](https://forum.inductiveautomation.com/u/schmidtf)\ **Post date:** [July 15, 2026, 5:04pm UTC](https://forum.inductiveautomation.com/t/tag-uncertain-lastknownvalue/116423/1 "2026-07-15T17:04:00Z")
Hello, I am getting an error on some tags in our provider saying that the quality is Uncertain\_LastKnownValue. These tags are reading from an FTLinx Gateway, if I use the quick client I get a Good value. If I use system.opc.read() then that typically sets the quality to Good in the tag browser in ignition itself. Any ideas what could be going on or locations on information to troubleshoot deeper? Thank you ---
**Author:** ![Jasmine\_Quick](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jasmine_quick/32/80380_2.png) [@Jasmine\_Quick](https://forum.inductiveautomation.com/u/Jasmine_Quick)\ **Post date:** [July 15, 2026, 8:31pm UTC](https://forum.inductiveautomation.com/t/tag-uncertain-lastknownvalue/116423/2 "2026-07-15T20:31:43Z")
Are they brand new tags? What driver, what version of rockwell, and can you paste an example of a tag config? ---
**Author:** ![schmidtf](https://avatars.discourse-cdn.com/v4/letter/s/5daacb/32.png) [@schmidtf](https://forum.inductiveautomation.com/u/schmidtf)\ **Post date:** [July 16, 2026, 4:14pm UTC](https://forum.inductiveautomation.com/t/tag-uncertain-lastknownvalue/116423/3 "2026-07-16T16:14:43Z")
Not brand new tags as well as they were previously working tags It is the OPC driver connected to FTLinx Gateway I am unsure of the version of that gateway