# UDT - data type not able to read

**URL:** <https://forum.inductiveautomation.com/t/udt-data-type-not-able-to-read/80260>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [October 10, 2023, 8:36am UTC](https://forum.inductiveautomation.com/t/udt-data-type-not-able-to-read/80260 "2023-10-10T08:36:40Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Learner\_Ignition](https://avatars.discourse-cdn.com/v4/letter/l/b3f665/32.png) [@Learner\_Ignition](https://forum.inductiveautomation.com/u/Learner_Ignition)\
**Post date:** [October 10, 2023, 8:36am UTC](https://forum.inductiveautomation.com/t/udt-data-type-not-able-to-read/80260/1 "2023-10-10T08:36:40Z")

</div>

Hi,  
I am trying to read UDT instance data type.

![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/8/28c337ac32b7b976cece31d64707905b1d100265.png)

I try` system.tag.readBlocking(["[Test_Tag_Provider]Station_1.dataType"])` but not able to get the `Station` as the output.

any suggestions will be helpful.

---

<div class="post-metadata">

**Author:** ![deon.korb](https://avatars.discourse-cdn.com/v4/letter/d/8c91f0/32.png) [@deon.korb](https://forum.inductiveautomation.com/u/deon.korb)\
**Post date:** [October 10, 2023, 8:39am UTC](https://forum.inductiveautomation.com/t/udt-data-type-not-able-to-read/80260/2 "2023-10-10T08:39:54Z")

</div>

Try:  
`system.tag.readBlocking(["[Test_Tag_Provider]Station_1.typeId"])[0].value`

---

<div class="post-metadata">

**Author:** ![Learner\_Ignition](https://avatars.discourse-cdn.com/v4/letter/l/b3f665/32.png) [@Learner\_Ignition](https://forum.inductiveautomation.com/u/Learner_Ignition)\
**Post date:** [October 10, 2023, 8:41am UTC](https://forum.inductiveautomation.com/t/udt-data-type-not-able-to-read/80260/3 "2023-10-10T08:41:17Z")

</div>

Great Thanks alot.