# Ofs with ignition 8.0, timestamp event issue **URL:** \ **Category:** Ignition\ **Created:** [December 4, 2020, 12:42pm UTC](https://forum.inductiveautomation.com/t/ofs-with-ignition-8-0-timestamp-event-issue/41204 "2020-12-04T12:42:31Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![jianlinlee](https://avatars.discourse-cdn.com/v4/letter/j/7993a0/32.png) [@jianlinlee](https://forum.inductiveautomation.com/u/jianlinlee)\ **Post date:** [December 4, 2020, 12:42pm UTC](https://forum.inductiveautomation.com/t/ofs-with-ignition-8-0-timestamp-event-issue/41204/1 "2020-12-04T12:42:31Z")
![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/1/d193c69ea21fc1db702ea8beb3c4d704992df6eb.jpeg) Hi, I have an issue using the schneider OFS server with ignition 8.0 to create the timestamp alarm. Ofs require to set a special subscription group name, which is scan class in ignition, in order to get the timestamp alarm from PLC. We are able to set at first following the group name \_Group\_0000 for default scan class, and able to get the timestamp alarm. However, when the ignition server switch over to secondary, and switch back to primary, the group name become \_Group\_0001 which is different from the timestamp group setting, only when we restart ofs server it will back to \_Group\_0000. And we have no way to fix it. Is there any solution for this ? Thanks a lot. ---
**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:** [December 4, 2020, 12:51pm UTC](https://forum.inductiveautomation.com/t/ofs-with-ignition-8-0-timestamp-event-issue/41204/2 "2020-12-04T12:51:13Z")
COM connections in Ignition have a “UniqueGroupNames” setting - have you tried setting this to `false`? ---
**Author:** ![jianlinlee](https://avatars.discourse-cdn.com/v4/letter/j/7993a0/32.png) [@jianlinlee](https://forum.inductiveautomation.com/u/jianlinlee)\ **Post date:** [December 4, 2020, 1:03pm UTC](https://forum.inductiveautomation.com/t/ofs-with-ignition-8-0-timestamp-event-issue/41204/3 "2020-12-04T13:03:36Z")
Where do i find this setting ? ---
**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:** [December 4, 2020, 1:05pm UTC](https://forum.inductiveautomation.com/t/ofs-with-ignition-8-0-timestamp-event-issue/41204/4 "2020-12-04T13:05:58Z")
In the Ignition Gateway when editing the OPC COM connection that you have configured for the connection to OFS. It may be hidden by default until you clicked the “show advanced” checkbox at the bottom. ---
**Author:** ![jianlinlee](https://avatars.discourse-cdn.com/v4/letter/j/7993a0/32.png) [@jianlinlee](https://forum.inductiveautomation.com/u/jianlinlee)\ **Post date:** [December 4, 2020, 1:09pm UTC](https://forum.inductiveautomation.com/t/ofs-with-ignition-8-0-timestamp-event-issue/41204/5 "2020-12-04T13:09:16Z")
Hi thanks Kevin. Will try that out on monday. ---
**Author:** ![jianlinlee](https://avatars.discourse-cdn.com/v4/letter/j/7993a0/32.png) [@jianlinlee](https://forum.inductiveautomation.com/u/jianlinlee)\ **Post date:** [December 4, 2020, 5:22pm UTC](https://forum.inductiveautomation.com/t/ofs-with-ignition-8-0-timestamp-event-issue/41204/6 "2020-12-04T17:22:59Z")
I have a concern, if i have multiple PLC need the timestamp event, if i create all PLC tags under the same scan class, will it be under the same COM subscription group? Example all different PLC tags under default scan class, will it all under \_Group\_0000? ---
**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:** [December 4, 2020, 5:25pm UTC](https://forum.inductiveautomation.com/t/ofs-with-ignition-8-0-timestamp-event-issue/41204/7 "2020-12-04T17:25:34Z")
If all the OPC tags from those devices are from the same OPC COM connection then yes, if they are in the same group they will be in the same COM subscription. ---
**Author:** ![jianlinlee](https://avatars.discourse-cdn.com/v4/letter/j/7993a0/32.png) [@jianlinlee](https://forum.inductiveautomation.com/u/jianlinlee)\ **Post date:** [December 5, 2020, 3:00am UTC](https://forum.inductiveautomation.com/t/ofs-with-ignition-8-0-timestamp-event-issue/41204/8 "2020-12-05T03:00:34Z")
Same OPC COM connection does it mean configure in the same scan class in ignition ? For this project all the points required timestamp alarm so we just configure all tags from all PLC in the default scan class. ---
**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:** [December 5, 2020, 3:54am UTC](https://forum.inductiveautomation.com/t/ofs-with-ignition-8-0-timestamp-event-issue/41204/9 "2020-12-05T03:54:00Z")
Sounds like you don’t have any other choice than to create everything in a single scan class and therefore a single COM subscription. ---
**Author:** ![jianlinlee](https://avatars.discourse-cdn.com/v4/letter/j/7993a0/32.png) [@jianlinlee](https://forum.inductiveautomation.com/u/jianlinlee)\ **Post date:** [December 9, 2020, 3:07pm UTC](https://forum.inductiveautomation.com/t/ofs-with-ignition-8-0-timestamp-event-issue/41204/10 "2020-12-09T15:07:27Z")
Hi Kevin, Your setting works and I have fixed group name now. But I face another issue after that, the OPC works well for a while, but after few hours all the tags will go to Bad quality, but the value will update following the PLC changes, means it actually get the value change, but no alarm show. After restart OFS server it will back to normal and then after few hours Bad quality again. May I know what troubleshooting steps we need to perform and any suspected reason ? We are on ignition 8.0 and ofs install with license as well, sometime we also face quality become :Bad\_Trialexpired, this is another issue. possible to identified the cause ? Thanks. ![WhatsApp Image 2020-12-09 at 9.50.42 PM](https://us1.discourse-cdn.com/inductiveautomation/original/3X/c/b/cb4d2c93a78b9daf540adcb1cc8f25852546dcfa.jpeg) ---
**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:** [December 9, 2020, 3:33pm UTC](https://forum.inductiveautomation.com/t/ofs-with-ignition-8-0-timestamp-event-issue/41204/11 "2020-12-09T15:33:18Z")
I think you may want to start a support ticket at this point, I’m not sure how to troubleshoot this any more.