# Bind Engineering unit to a tag inside UDT **URL:** \ **Category:** Ignition\ **Tags:** ignition81\ **Created:** [June 13, 2022, 8:02pm UTC](https://forum.inductiveautomation.com/t/bind-engineering-unit-to-a-tag-inside-udt/60716 "2022-06-13T20:02:39Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Urvish\_Mehta](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/urvish_mehta/32/81912_2.png) [@Urvish\_Mehta](https://forum.inductiveautomation.com/u/Urvish_Mehta)\ **Post date:** [June 13, 2022, 8:02pm UTC](https://forum.inductiveautomation.com/t/bind-engineering-unit-to-a-tag-inside-udt/60716/1 "2022-06-13T20:02:40Z")
Hello Everyone, I have a UDT for VFD. Engineering unit for Speed will change depending on where machine is going, It can be RPM or ft/min. Now PLC have a int tag for the same, like 1=ft/min , 2=RPM etc. Now I created expression tag in UDT to convert int to string, now I need to bind this tag to actual speed tag’s engineering unit but unfortunately I can only bind engineering unit to parameter and I can not write parameter value automatically like binding property to a tag value in same UDT. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/f/bf1c5dbe0b25a8f68dccda97583adc7ef1ad3b43.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/f/7/f7a5d98fc533d8de942ffba91b3e25219f0f51f5.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/7/6/7610254106cdbbd1c502d0c21947e67813ec7f61.png) I might have confused you. Please ask if you have any doubts, I hope to be able to connect these two. Let me know your thoughts. Thank you ---
**Author:** ![SBL](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/sbl/32/56813_2.png) [@SBL](https://forum.inductiveautomation.com/u/SBL)\ **Post date:** [September 28, 2022, 7:15am UTC](https://forum.inductiveautomation.com/t/bind-engineering-unit-to-a-tag-inside-udt/60716/2 "2022-09-28T07:15:42Z")
We solved this by adding a tag event script on our unit tag. ![screenshot](https://us1.discourse-cdn.com/inductiveautomation/original/3X/c/7/c7707346fb9a53b87fbdc186c9ab05b6c7550c13.png)