# Data Quality bit mask **URL:** \ **Category:** General Discussion\ **Created:** [May 14, 2012, 8:35am UTC](https://forum.inductiveautomation.com/t/data-quality-bit-mask/4460 "2012-05-14T08:35:43Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![marioquark](https://avatars.discourse-cdn.com/v4/letter/m/22d042/32.png) [@marioquark](https://forum.inductiveautomation.com/u/marioquark)\ **Post date:** [May 14, 2012, 8:35am UTC](https://forum.inductiveautomation.com/t/data-quality-bit-mask/4460/1 "2012-05-14T08:35:43Z")
is there a Data Quality bit mask explanation? i can find in the help the list of the possible states, but not the mapping with the tag value… tnx ---
**Author:** ![Travis.Cox](https://avatars.discourse-cdn.com/v4/letter/t/b9bd4f/32.png) [@Travis.Cox](https://forum.inductiveautomation.com/u/Travis.Cox)\ **Post date:** [May 14, 2012, 3:27pm UTC](https://forum.inductiveautomation.com/t/data-quality-bit-mask/4460/2 "2012-05-14T15:27:04Z")
Data quality is not a bit mask. Here are the possible values and their corresponding overlay: [inductiveautomation.com/supp … erlays.htm](http://www.inductiveautomation.com/support/usermanuals/ignition/quality_overlays.htm) ---
**Author:** ![marioquark](https://avatars.discourse-cdn.com/v4/letter/m/22d042/32.png) [@marioquark](https://forum.inductiveautomation.com/u/marioquark)\ **Post date:** [May 14, 2012, 3:42pm UTC](https://forum.inductiveautomation.com/t/data-quality-bit-mask/4460/3 "2012-05-14T15:42:49Z")
my tags have often quality set to -1 or 192. i can’t understand what this means… ---
**Author:** ![Greg.Buehler](https://avatars.discourse-cdn.com/v4/letter/g/ecc23a/32.png) [@Greg.Buehler](https://forum.inductiveautomation.com/u/Greg.Buehler)\ **Post date:** [May 14, 2012, 3:50pm UTC](https://forum.inductiveautomation.com/t/data-quality-bit-mask/4460/4 "2012-05-14T15:50:59Z")
[quote=“marioquark”]my tags have often quality set to -1 or 192. i can’t understand what this means…[/quote] 192 means GOOD quality. I’m pretty sure -1 was an alias to a generic bad quality state iirc. ---
**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:** [May 14, 2012, 4:03pm UTC](https://forum.inductiveautomation.com/t/data-quality-bit-mask/4460/5 "2012-05-14T16:03:58Z")
I’m looking around to see if we have a better list of DataQuality\<–\>Value than the overlay section Travis mentioned, but it’s not looking good… Looks like we’ll have to add one. ---
**Author:** ![marioquark](https://avatars.discourse-cdn.com/v4/letter/m/22d042/32.png) [@marioquark](https://forum.inductiveautomation.com/u/marioquark)\ **Post date:** [May 15, 2012, 7:15am UTC](https://forum.inductiveautomation.com/t/data-quality-bit-mask/4460/6 "2012-05-15T07:15:02Z")
i’m waiting. thanks ![:thumb_left:](https://us1.discourse-cdn.com/inductiveautomation/original/1X/e26afb081ddde6df016df6ee49159cf56aaca688.gif ":thumb\_left:")