# OPC-DA Unknown Quality **URL:** \ **Category:** Ignition\ **Created:** [July 17, 2017, 4:17pm UTC](https://forum.inductiveautomation.com/t/opc-da-unknown-quality/14809 "2017-07-17T16:17:55Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![hcarroll](https://avatars.discourse-cdn.com/v4/letter/h/e47c2d/32.png) [@hcarroll](https://forum.inductiveautomation.com/u/hcarroll)\ **Post date:** [July 17, 2017, 4:17pm UTC](https://forum.inductiveautomation.com/t/opc-da-unknown-quality/14809/1 "2017-07-17T16:17:55Z")
I’m trying to connect to data from a remote machine running Wonderware system platform using OPC-DA. I’m able to connect to the da server, but I’m unable to browse tags except the system $sys tags. If I use the Matrikon OPC client I can type in the tag path and get good quality data, but if I try it in Ignition, I get nulls and the unknown tag quality icon. I’m using Ignition 7.9.3. Has anybody had success doing this? ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [July 17, 2017, 5:46pm UTC](https://forum.inductiveautomation.com/t/opc-da-unknown-quality/14809/2 "2017-07-17T17:46:55Z")
Any errors in the gateway console? System -\> Diagnostics -\> Logs. ---
**Author:** ![hcarroll](https://avatars.discourse-cdn.com/v4/letter/h/e47c2d/32.png) [@hcarroll](https://forum.inductiveautomation.com/u/hcarroll)\ **Post date:** [July 17, 2017, 6:05pm UTC](https://forum.inductiveautomation.com/t/opc-da-unknown-quality/14809/3 "2017-07-17T18:05:31Z")
Not for a while. I had a COMSubscription warning about 45 minutes ago. ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [July 17, 2017, 6:31pm UTC](https://forum.inductiveautomation.com/t/opc-da-unknown-quality/14809/4 "2017-07-17T18:31:21Z")
Go through these steps and see if you get any errors in the console each time: 1. Edit -\> Save the connection in Ignition, from Configure -\> OPC Connections -\> Servers 2. Open the quick client, try to browse the DA server 3. Bring in $sys tags 4. Create an OPC tag manually ---
**Author:** ![hcarroll](https://avatars.discourse-cdn.com/v4/letter/h/e47c2d/32.png) [@hcarroll](https://forum.inductiveautomation.com/u/hcarroll)\ **Post date:** [July 17, 2017, 7:37pm UTC](https://forum.inductiveautomation.com/t/opc-da-unknown-quality/14809/5 "2017-07-17T19:37:54Z")
After step 1, I get these warnings and errors: ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/f/f76f0bf5e7dda9210a2bfad01c05f4543825465c.png) After browsing, I get the browse warnings: ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/c/cb7422fb67f864fd68021c76a7002e0fcf574337.png) Bringing in the system tags and creating an opc tag manually didn’t give any problems. ---
**Author:** ![saurabhambildhuke08](https://avatars.discourse-cdn.com/v4/letter/s/91b2a8/32.png) [@saurabhambildhuke08](https://forum.inductiveautomation.com/u/saurabhambildhuke08)\ **Post date:** [March 21, 2019, 9:17am UTC](https://forum.inductiveautomation.com/t/opc-da-unknown-quality/14809/6 "2019-03-21T09:17:00Z")
Hello All, I am getting the same the problem as above topic. I have created one OPC connection and created Topic name on RSLinx Classic gateway. the PLC is Emulated PLC. So when I am getting problem of tag values are null and Unknown. the OPC Connection is Connected but still I am getting the tag quality Null, Unknown on Ignition QuickClient. Also on the Logs page, i am getting error i.e COMSubscription - **[Scanclass ‘Default[default]’] Failed to add 156 items to the subscription- error codes were returned from the OPC server. To see the codes, change the log level to debug and re-initialize the items.** Awaiting your responses. Thanks ---
**Author:** ![jzngyi](https://avatars.discourse-cdn.com/v4/letter/j/a5b964/32.png) [@jzngyi](https://forum.inductiveautomation.com/u/jzngyi)\ **Post date:** [October 16, 2020, 4:53am UTC](https://forum.inductiveautomation.com/t/opc-da-unknown-quality/14809/7 "2020-10-16T04:53:59Z")
Having the same issue and warning logs here, is there any solution?