# Alarms - Display path expression

**URL:** <https://forum.inductiveautomation.com/t/alarms-display-path-expression/11338>\
**Category:** Ignition\
**Created:** [March 9, 2016, 3:39pm UTC](https://forum.inductiveautomation.com/t/alarms-display-path-expression/11338 "2016-03-09T15:39:24Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![AleInge](https://avatars.discourse-cdn.com/v4/letter/a/46a35a/32.png) [@AleInge](https://forum.inductiveautomation.com/u/AleInge)\
**Post date:** [March 9, 2016, 3:39pm UTC](https://forum.inductiveautomation.com/t/alarms-display-path-expression/11338/1 "2016-03-09T15:39:24Z")

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Hi all,

I have an UDT tag with some alarms and I’d like to configure the display paths as an expression, but I am having some troubles… I would to concatenate an UDT parameter and a tag value (string), then I tried:

```auto
{[~]Alarm_Configuration/Alarm_root_path} + {id}
```

where “Alarm\_root\_path” is the tag, while “id” is the UDT parameter.

With such expression the system return (tag diagnostic): “Error forwarding data: Duplicate entry”  
I’ve tryed several solutions (also using cast to string, concatenate() and so on) but they didn’t work. However, using the expression tab I noticed that:

{[~]Alarm\_Configuration/Alarm\_root\_path} --\> works

{[~]Alarm\_Configuration/Alarm\_root\_path} + “/test” --\> works

{id} --\> doesn’t works

Then I am quite sure that the problem is the {id} expression, but I can’t figure how to fix it…  
Thank you,

Alessandro

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<div class="post-metadata">

**Author:** ![MMaynard](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mmaynard/32/3366_2.png) [@MMaynard](https://forum.inductiveautomation.com/u/MMaynard)\
**Post date:** [March 9, 2016, 10:59pm UTC](https://forum.inductiveautomation.com/t/alarms-display-path-expression/11338/2 "2016-03-09T22:59:27Z")

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Have you tried?

```auto
'{[~]Alarm_Configuration/Alarm_root_path}' + '{id}'
```

Note the single quotes around both.

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<div class="post-metadata">

**Author:** ![AleInge](https://avatars.discourse-cdn.com/v4/letter/a/46a35a/32.png) [@AleInge](https://forum.inductiveautomation.com/u/AleInge)\
**Post date:** [March 10, 2016, 8:05am UTC](https://forum.inductiveautomation.com/t/alarms-display-path-expression/11338/3 "2016-03-10T08:05:22Z")

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I have tried with single quote but not as you suggest: just tried now and works correctly !

Thank you !