# Binding to FormatString and EngUnit in UDT definition tags not working?

**URL:** <https://forum.inductiveautomation.com/t/binding-to-formatstring-and-engunit-in-udt-definition-tags-not-working/78043>\
**Category:** Ignition\
**Created:** [August 18, 2023, 12:54am UTC](https://forum.inductiveautomation.com/t/binding-to-formatstring-and-engunit-in-udt-definition-tags-not-working/78043 "2023-08-18T00:54:48Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [August 18, 2023, 12:54am UTC](https://forum.inductiveautomation.com/t/binding-to-formatstring-and-engunit-in-udt-definition-tags-not-working/78043/1 "2023-08-18T00:54:48Z")

</div>

I have a UDT definition where I'm passing in parameters for engUnit, engLow/High, and formatString. The low and high seems to be working, but the formatString and engUnit don't 😕 see screenshots below for:  
Tag config:  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/4/a/4ab1e814f2334a9f52d01203e4e5b19ba12097f8.png)

Bindings to the properties:  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/3/a303507abf0a06019c5ddd8cca23427ef4f3724f.png)

Binding config example on engUnit:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/c/ec86031f60141730c893e17d76aa9c095bf1bdd1.png)

Not sure what's going on? Interestingly, the low/high bindings in the tag are grey, whereas the other two are black. All are in italics though.

For now, I'll just bind to the UDT parameters instead

---

<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [August 18, 2023, 1:13am UTC](https://forum.inductiveautomation.com/t/binding-to-formatstring-and-engunit-in-udt-definition-tags-not-working/78043/2 "2023-08-18T01:13:55Z")

</div>

Just for kicks, try lowercase "E" and "F" in your indirect binding.

---

<div class="post-metadata">

**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [August 18, 2023, 2:02am UTC](https://forum.inductiveautomation.com/t/binding-to-formatstring-and-engunit-in-udt-definition-tags-not-working/78043/3 "2023-08-18T02:02:54Z")

</div>

I actually see the same units in the tag browser value too, so I don't think it's that ☹