# Omron FINS Driver & Tag Quality 'Uncertain\_LastKnownValue'

**URL:** <https://forum.inductiveautomation.com/t/omron-fins-driver-tag-quality-uncertain-lastknownvalue/87577>\
**Category:** Ignition\
**Tags:** vision\
**Created:** [March 19, 2024, 6:06pm UTC](https://forum.inductiveautomation.com/t/omron-fins-driver-tag-quality-uncertain-lastknownvalue/87577 "2024-03-19T18:06:41Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![S1ack](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/s1ack/32/22451_2.png) [@S1ack](https://forum.inductiveautomation.com/u/S1ack)\
**Post date:** [March 19, 2024, 6:06pm UTC](https://forum.inductiveautomation.com/t/omron-fins-driver-tag-quality-uncertain-lastknownvalue/87577/1 "2024-03-19T18:06:41Z")

</div>

I've seen this issue randomly about 3 times while developing on customer's hardware (bench testing). This over the span of just over a year. It's never been reported by the customer in production. But I am curious.

In a vision client I see Unknown overlay on a PLC tag.

Typically, the PLC is not power cycled. The gateway PC is typically turned off nightly. In this last instance I turned off the gateway for few hours this morning.  
Once back on, comms appear absolutely normal. But this one tag (so far as I am aware of there are no others).

![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/1/e14d528c71d4c6f91be57193dfbfa3dd6bda1cb1.png)

If I restart the tag in the designer. It eventually goes away.  
I am not sure why this happens, nor can I reproduce it.  
Gateway is 8.1.36  
Omron Driver 4.1.36

I looked at logs via the web admin.  
Several "FinsTcpFrameCodec Exception caught, closing channel." are all that I saw in the time frame of interest. And the 2 that I saw do not speak to a FINS driver address (like many failed writes from when (I assume) I was doing something with the PLC).

Any insight would be appreciated.

---

<div class="post-metadata">

**Author:** ![Herman\_Lundberg](https://avatars.discourse-cdn.com/v4/letter/h/df705f/32.png) [@Herman\_Lundberg](https://forum.inductiveautomation.com/u/Herman_Lundberg)\
**Post date:** [April 23, 2025, 12:03pm UTC](https://forum.inductiveautomation.com/t/omron-fins-driver-tag-quality-uncertain-lastknownvalue/87577/2 "2025-04-23T12:03:32Z")

</div>

We have had a similar occurence. In the log we got the same error message and after that we lost contact with the Omron PLC as it was constantly reconnecting. I did a change and revert on IP-adress in the settings and then it connected again. Did you ever find any reason for this?

---

<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [April 23, 2025, 12:08pm UTC](https://forum.inductiveautomation.com/t/omron-fins-driver-tag-quality-uncertain-lastknownvalue/87577/3 "2025-04-23T12:08:05Z")

</div>

If you find yourself in that situation again get a Wireshark capture if possible. Start it during the failed reconnect attempts, keep it capturing until after you do whatever fiddling with the settings to make it connect again.

---

<div class="post-metadata">

**Author:** ![S1ack](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/s1ack/32/22451_2.png) [@S1ack](https://forum.inductiveautomation.com/u/S1ack)\
**Post date:** [April 23, 2025, 1:53pm UTC](https://forum.inductiveautomation.com/t/omron-fins-driver-tag-quality-uncertain-lastknownvalue/87577/4 "2025-04-23T13:53:58Z")

</div>

> [@Herman\_Lundberg](#):
>
> Did you ever find any reason for this?

Sorry, I did not. End user has never queried me about any tag overlays so I assume on both production machines it has not occured.