# Tag values freeze **URL:** \ **Category:** Ignition\ **Created:** [March 19, 2010, 12:02pm UTC](https://forum.inductiveautomation.com/t/tag-values-freeze/1667 "2010-03-19T12:02:21Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![mws2674](https://avatars.discourse-cdn.com/v4/letter/m/958977/32.png) [@mws2674](https://forum.inductiveautomation.com/u/mws2674)\ **Post date:** [March 19, 2010, 12:02pm UTC](https://forum.inductiveautomation.com/t/tag-values-freeze/1667/1 "2010-03-19T12:02:21Z")
I have set up three float tags and made them historical. I then trend the values in a chart. Everything works well for anywhere between 1 - 2 hours, and then the tag values freeze. There are no errors, and the tag overlays show the tag values as good. When I log into the controller with logix5000 however, I can see that the actual tag values have changed. To fix this, I have to restart the gateway. As soon as I do, everything takes off and starts working again for another few hours. When these tags quit updating, I notice that I am unable to read/write to any other tags on the system as well, so this must be an opc-ua issue. I’m running 7.0.5 (b4679), with CompactLogix controller (L35E) ---
**Author:** ![AlThePal](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/althepal/32/3603_2.png) [@AlThePal](https://forum.inductiveautomation.com/u/AlThePal)\ **Post date:** [March 19, 2010, 2:19pm UTC](https://forum.inductiveautomation.com/t/tag-values-freeze/1667/2 "2010-03-19T14:19:44Z")
It’s nothing as simple as the system timing out in demo mode, is it? ---
**Author:** ![mws2674](https://avatars.discourse-cdn.com/v4/letter/m/958977/32.png) [@mws2674](https://forum.inductiveautomation.com/u/mws2674)\ **Post date:** [March 19, 2010, 2:50pm UTC](https://forum.inductiveautomation.com/t/tag-values-freeze/1667/3 "2010-03-19T14:50:39Z")
Unfortunatly, no. Ignition is licensed. I’ve been watching the system closely today since I made this post, and so far, knock on wood, it has not had any hiccups. It has been running for about 4 hours now. Maybe it was something I was doing. ---
**Author:** ![Carl.Gould](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/carl.gould/32/7262_2.png) [@Carl.Gould](https://forum.inductiveautomation.com/u/Carl.Gould)\ **Post date:** [March 19, 2010, 3:43pm UTC](https://forum.inductiveautomation.com/t/tag-values-freeze/1667/4 "2010-03-19T15:43:28Z")
Other reps might have some more detailed questions for you, but I just want to say: If it happens again, call us while it is happening (don’t restart the Gateway) so that we can “catch it in the act”. ---
**Author:** ![mws2674](https://avatars.discourse-cdn.com/v4/letter/m/958977/32.png) [@mws2674](https://forum.inductiveautomation.com/u/mws2674)\ **Post date:** [March 19, 2010, 3:57pm UTC](https://forum.inductiveautomation.com/t/tag-values-freeze/1667/5 "2010-03-19T15:57:43Z")
lol… I just came back in from lunch, and discovered that the tag values had ‘stalled’ again. Not 2 seconds after i restarted, I got email notification for your reply!!! Just my luck. This time, instead of restarting the gateway, I only restarted the OPC\_UA module, and the tags started updating again. If I see this happen again today, I will give you guys a call. ---
**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:** [March 19, 2010, 4:07pm UTC](https://forum.inductiveautomation.com/t/tag-values-freeze/1667/6 "2010-03-19T16:07:08Z")
Do you think you could set up one of the sim drivers for me in a similar fashion (3 float tags, historical, trending in a chart) and see if those freeze also? This will be the quickest way to differentiate between a problem with the OPC-UA Server or a problem with the CompactLogix driver. ---
**Author:** ![mws2674](https://avatars.discourse-cdn.com/v4/letter/m/958977/32.png) [@mws2674](https://forum.inductiveautomation.com/u/mws2674)\ **Post date:** [March 19, 2010, 5:12pm UTC](https://forum.inductiveautomation.com/t/tag-values-freeze/1667/7 "2010-03-19T17:12:36Z")
Kevin, I set up the sim dev with 3 float, historical, and am trending the values. CompactLogix tags are stalled, and the sim tags are still reading, so apparently this is a driver issue. ---
**Author:** ![Kyle\_Chase](https://avatars.discourse-cdn.com/v4/letter/k/9de0a6/32.png) [@Kyle\_Chase](https://forum.inductiveautomation.com/u/Kyle_Chase)\ **Post date:** [March 20, 2010, 1:05am UTC](https://forum.inductiveautomation.com/t/tag-values-freeze/1667/8 "2010-03-20T01:05:29Z")
This problem was noticed a few days ago, and has been fixed in the latest development release 4707. Check the downloads section. To replicate, after the subscription has been running for a few minutes, either add a new sqltag to an unsubscribed OPC items, or start a transaction group with unsubscribed OPC items. Apparently, the connections were getting dropped somewhere between the gateway and OPC driver.