# Unknown VS Bad tag quality **URL:** \ **Category:** Ignition\ **Created:** [February 27, 2018, 6:14pm UTC](https://forum.inductiveautomation.com/t/unknown-vs-bad-tag-quality/17157 "2018-02-27T18:14:58Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![heybales](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/heybales/32/3358_2.png) [@heybales](https://forum.inductiveautomation.com/u/heybales)\ **Post date:** [February 27, 2018, 6:14pm UTC](https://forum.inductiveautomation.com/t/unknown-vs-bad-tag-quality/17157/1 "2018-02-27T18:14:58Z")
I have a project where I communicate with scales via modbus TCP. The scales get powered down when the line is idle. ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/c/c2f57438bdffe42b0ffc5cce0fee0e0778b18457.png) As you can see I have 2 different tag quality indications. Line 7 is Unknown, and Line 8 is Bad Quality. In both cases, the driver status is the same; toggling from Connecting to Faulted. So why do I have two different qualities? My guess is that Line 7 has been offline since the modbus driver started, and Line 8 communicated for a while and then powered down. But the Ignition gateway has been running uninterrupted for a month. And Line 7 has definitely been online more recently than that. I have not made any changes to tags, which I’m sure would reset statuses. I have made changes to graphics and scripts, and published the project. Would that publish reset the modbus driver, or the tag statuses? ---
**Author:** ![Connor](https://avatars.discourse-cdn.com/v4/letter/c/e99b99/32.png) [@Connor](https://forum.inductiveautomation.com/u/Connor)\ **Post date:** [May 18, 2018, 5:19pm UTC](https://forum.inductiveautomation.com/t/unknown-vs-bad-tag-quality/17157/2 "2018-05-18T17:19:40Z")
What is the value associated with the ‘Unknown’ quality? Is it 600 or 256?