# UDT and OPC Path

**URL:** <https://forum.inductiveautomation.com/t/udt-and-opc-path/42009>\
**Category:** Ignition\
**Created:** [January 6, 2021, 8:42pm UTC](https://forum.inductiveautomation.com/t/udt-and-opc-path/42009 "2021-01-06T20:42:19Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![melwadeya](https://avatars.discourse-cdn.com/v4/letter/m/ed8c4c/32.png) [@melwadeya](https://forum.inductiveautomation.com/u/melwadeya)\
**Post date:** [January 6, 2021, 8:42pm UTC](https://forum.inductiveautomation.com/t/udt-and-opc-path/42009/1 "2021-01-06T20:42:19Z")

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Hello,  
I am trying to use a parameter (path) to reference an OPC item in a UDT.  
The issue is that the path from the OPC server contains: {0,29}:  
Actual OPC item path: **CS.B53\_CELLS.1120WIR0.Description{0,29}**  
Parameterized Path: **{Path}.Description{0,29}**

which then gives an error:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/f/a/faa8e2f5a96da2bc4bbf4466ffebd118aad53f06.png)

Any thought how to overcome this? greatly appreciated.

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<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:** [January 6, 2021, 8:53pm UTC](https://forum.inductiveautomation.com/t/udt-and-opc-path/42009/2 "2021-01-06T20:53:18Z")

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Have you tried without the end bit {0,29}? Do you need this?

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<div class="post-metadata">

**Author:** ![melwadeya](https://avatars.discourse-cdn.com/v4/letter/m/ed8c4c/32.png) [@melwadeya](https://forum.inductiveautomation.com/u/melwadeya)\
**Post date:** [January 6, 2021, 9:06pm UTC](https://forum.inductiveautomation.com/t/udt-and-opc-path/42009/3 "2021-01-06T21:06:51Z")

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Yes I tried and got nothing!

This {0,29} is part of the item name and it appears in other items e.g. TagName{0,13}

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<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:** [January 6, 2021, 10:26pm UTC](https://forum.inductiveautomation.com/t/udt-and-opc-path/42009/4 "2021-01-06T22:26:47Z")

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Strange… what’s the end device? I imagine that could interfere with IA’s feature of using the curly braces to provide parameterisation

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<div class="post-metadata">

**Author:** ![melwadeya](https://avatars.discourse-cdn.com/v4/letter/m/ed8c4c/32.png) [@melwadeya](https://forum.inductiveautomation.com/u/melwadeya)\
**Post date:** [January 7, 2021, 1:15pm UTC](https://forum.inductiveautomation.com/t/udt-and-opc-path/42009/6 "2021-01-07T13:15:37Z")

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The conversion did not work.  
Also, I tried to bind the path to the OPC item directly and it works but when I try to use a parameter {FMS\_Path} it fails:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/1/a14b43f26d5526858f57128be8b989091ce0d79e.png)

any thoughts?