# UDT Parameter as reference to another parameter of same UDT

**URL:** <https://forum.inductiveautomation.com/t/udt-parameter-as-reference-to-another-parameter-of-same-udt/39983>\
**Category:** Ignition\
**Tags:** ignition80\
**Created:** [October 24, 2020, 3:56pm UTC](https://forum.inductiveautomation.com/t/udt-parameter-as-reference-to-another-parameter-of-same-udt/39983 "2020-10-24T15:56:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Gaurav.Shitole](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/gaurav.shitole/32/72050_2.png) [@Gaurav.Shitole](https://forum.inductiveautomation.com/u/Gaurav.Shitole)\
**Post date:** [October 24, 2020, 3:56pm UTC](https://forum.inductiveautomation.com/t/udt-parameter-as-reference-to-another-parameter-of-same-udt/39983/1 "2020-10-24T15:56:44Z")

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Hello,

In the attached pic is the tag structure of my UDT. We are receiving these values from AB PLC like Engg Unit and Engg limits. Hence I have created these as a member inside UDT.

Thing is now I want to use these received parameters inside my UDT.  
e.g., I want my **SP\_HH** to use **OUT\_HIGH** and **OUT\_LOW** as its Engg Limits and use **EU** as its Engg units.  
However when I refer these member as **{OUT\_HIGH}** at the place of Engg High Limit of SP\_HH, I don’t recive that value there. Same happnes with EU, it says null value.

I tried writing like {[.]EU} then using tag({parentFolderPath} + “/EU.value”) but nothing worked.

Please assist.