# Writing from 1 UDT to other UDT,

**URL:** <https://forum.inductiveautomation.com/t/writing-from-1-udt-to-other-udt/116400>\
**Category:** Ignition\
**Tags:** scripting, vision, ignition81\
**Created:** [July 14, 2026, 4:07pm UTC](https://forum.inductiveautomation.com/t/writing-from-1-udt-to-other-udt/116400 "2026-07-14T16:07:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Adarsh\_Shelar](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@Adarsh\_Shelar](https://forum.inductiveautomation.com/u/Adarsh_Shelar)\
**Post date:** [July 14, 2026, 4:07pm UTC](https://forum.inductiveautomation.com/t/writing-from-1-udt-to-other-udt/116400/1 "2026-07-14T16:07:44Z")

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Hi connection,  
I have 2 UDT Definitions created as below i need to write some value to another UDT definition Tag that is memory tag

I am using this below script,  
`system.tag.writeBlocking(["[../../../Test/Check/Test]"],[3])`

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/8/7/8782a0eb21485fe71d8bfb6c4bd830941156d5ba.png)

In **New Tag** value I have script in value change, but I am unable to write to that one more UDT Definition Tag T **est/check/Test,**  
I know I am missing with exact tag path; can anyone help me.

Thanks for advance Connection,

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<div class="post-metadata">

**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 14, 2026, 4:19pm UTC](https://forum.inductiveautomation.com/t/writing-from-1-udt-to-other-udt/116400/2 "2026-07-14T16:19:48Z")

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You are showing two UDT **definitions**. If you want one UDT to (consistently) write to another UDT, they should both be inside one parent UDT to guarantee their relative locations to each other.

That will only matter once you have created any **instances** of the 'parent' UDT that contains both children.