# UDT Tag Groups/Scan Classes

**URL:** <https://forum.inductiveautomation.com/t/udt-tag-groups-scan-classes/34576>\
**Category:** Ignition\
**Created:** [May 8, 2020, 3:00pm UTC](https://forum.inductiveautomation.com/t/udt-tag-groups-scan-classes/34576 "2020-05-08T15:00:34Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![NII](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nii/32/12920_2.png) [@NII](https://forum.inductiveautomation.com/u/NII)\
**Post date:** [May 8, 2020, 3:00pm UTC](https://forum.inductiveautomation.com/t/udt-tag-groups-scan-classes/34576/1 "2020-05-08T15:00:34Z")

</div>

I have many instances of udt tags and I’d like to create a scan class depending on its quality (bad=no scan,good=1sec) and apply this to the tags.

Is there a way to select this scan class in the udt definition and propagate to all its instances?

Thanks.