# Unjustified transition of tags to Uncertain\_InitialValue **URL:** \ **Category:** Ignition\ **Tags:** perspective\ **Created:** [December 29, 2022, 2:45pm UTC](https://forum.inductiveautomation.com/t/unjustified-transition-of-tags-to-uncertain-initialvalue/68065 "2022-12-29T14:45:39Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Michal\_Goralczyk](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/michal_goralczyk/32/55564_2.png) [@Michal\_Goralczyk](https://forum.inductiveautomation.com/u/Michal_Goralczyk)\ **Post date:** [December 29, 2022, 2:45pm UTC](https://forum.inductiveautomation.com/t/unjustified-transition-of-tags-to-uncertain-initialvalue/68065/1 "2022-12-29T14:45:40Z")
Hello, Gateway IO-01 has multiple providers that read data from various devices, including Modbus, DNP and several OPC servers such as WAGO OPC Server (PLC) Kep Server and Marcom OPC Server. At some point, the tags are no more visible in IO-01 appears Quality - Uncertain\_LastKnownValue. This happens on different devices, different OPC servers, different connections. The Device connections tab does not show that there are problems with the connection to the devices. For some reason, even if there is a connection to the devices and OPC, the tags change to Uncertain\_LastKnownValue for some time remaining in this state. Then they are not archived in our SQL database. As a result, gaps are created in the charts for that time when there is an Uncertain state. Until 3 days ago it was working correctly and for some reason now the tags are changing to this state. Are there any comms settings on Gateway that could be causing this? Where we have a connection to the KepServer also changes the value to Uncertain on IO-01. I created a preview of these values on the OPC KepServer and it seems that there they are read correctly, there are no problems with reading the tags have the Good tag, no breaks in communication. However, Uncertain tags appear on IO-01, this is also confirmed by QuickClient on the IO-01 server. As I mentioned this problem did not occur before exists for several days. I also tried to move some of the readings to IO-02 (about 10%) thinking that it is a matter of too many tag or devices on Gateway but the problem continues. Best Regards, Michał Góralczyk ---
**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:** [December 29, 2022, 2:47pm UTC](https://forum.inductiveautomation.com/t/unjustified-transition-of-tags-to-uncertain-initialvalue/68065/2 "2022-12-29T14:47:47Z")
You should open a ticket with support. ---
**Author:** ![derrickdvdsn](https://avatars.discourse-cdn.com/v4/letter/d/3d9bf3/32.png) [@derrickdvdsn](https://forum.inductiveautomation.com/u/derrickdvdsn)\ **Post date:** [February 1, 2024, 4:26pm UTC](https://forum.inductiveautomation.com/t/unjustified-transition-of-tags-to-uncertain-initialvalue/68065/3 "2024-02-01T16:26:24Z")
Michal, Were you able to get this issue resolved? ---
**Author:** ![justin.huggins](https://avatars.discourse-cdn.com/v4/letter/j/d07c76/32.png) [@justin.huggins](https://forum.inductiveautomation.com/u/justin.huggins)\ **Post date:** [March 11, 2024, 6:53pm UTC](https://forum.inductiveautomation.com/t/unjustified-transition-of-tags-to-uncertain-initialvalue/68065/4 "2024-03-11T18:53:10Z")
Any update on this issue? Would love to know what resolved the issue. ---
**Author:** ![Michal\_Goralczyk](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/michal_goralczyk/32/55564_2.png) [@Michal\_Goralczyk](https://forum.inductiveautomation.com/u/Michal_Goralczyk)\ **Post date:** [March 11, 2024, 9:16pm UTC](https://forum.inductiveautomation.com/t/unjustified-transition-of-tags-to-uncertain-initialvalue/68065/5 "2024-03-11T21:16:54Z")
In my case, the problems have resolved. The changes we made were upgrading Ignition and KEPServer to the latest versions and migrating Ignition to Linux. In addition, we had a problem with uneven sampling of tags to the database but this was a problem of bad tag group configuration. What exactly fixed the problem is hard to say. We struggled with the problem and in the meantime they stopped. ---
**Author:** ![justin.huggins](https://avatars.discourse-cdn.com/v4/letter/j/d07c76/32.png) [@justin.huggins](https://forum.inductiveautomation.com/u/justin.huggins)\ **Post date:** [March 15, 2024, 4:47pm UTC](https://forum.inductiveautomation.com/t/unjustified-transition-of-tags-to-uncertain-initialvalue/68065/6 "2024-03-15T16:47:48Z")
Thanks for the information. Just curious, what drove you to switch to linux?