# Tag reference to a parameter in a UDT

**URL:** <https://forum.inductiveautomation.com/t/tag-reference-to-a-parameter-in-a-udt/31769>\
**Category:** Ignition\
**Created:** [January 30, 2020, 2:51pm UTC](https://forum.inductiveautomation.com/t/tag-reference-to-a-parameter-in-a-udt/31769 "2020-01-30T14:51:01Z")\
**Posts on this page:** 9\
**Page:** 1

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**Author:** ![Jorgeibesi](https://avatars.discourse-cdn.com/v4/letter/j/ba9def/32.png) [@Jorgeibesi](https://forum.inductiveautomation.com/u/Jorgeibesi)\
**Post date:** [January 30, 2020, 2:51pm UTC](https://forum.inductiveautomation.com/t/tag-reference-to-a-parameter-in-a-udt/31769/1 "2020-01-30T14:51:01Z")

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Hi, in a UDT, I can’t make a tag reference that point to a parameter. Also I can’t disable a tag with a logic condition with this parameter.

Ex:  
(UDT) Motor-\> Parameter - numberMotor  
(tag OPC) Amps\> enabled property (disabled if numberMotor = 2)  
(tag reference) motorType\> value (point to nomberMotor)

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**Author:** ![Jorgeibesi](https://avatars.discourse-cdn.com/v4/letter/j/ba9def/32.png) [@Jorgeibesi](https://forum.inductiveautomation.com/u/Jorgeibesi)\
**Post date:** [January 30, 2020, 8:42pm UTC](https://forum.inductiveautomation.com/t/tag-reference-to-a-parameter-in-a-udt/31769/2 "2020-01-30T20:42:44Z")

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Help, please

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**Author:** ![JordanCClark](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jordancclark/32/83362_2.png) [@JordanCClark](https://forum.inductiveautomation.com/u/JordanCClark)\
**Post date:** [January 31, 2020, 12:31pm UTC](https://forum.inductiveautomation.com/t/tag-reference-to-a-parameter-in-a-udt/31769/3 "2020-01-31T12:31:12Z")

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> [@Jorgeibesi](#):
>
> (tag OPC) Amps\> enabled property (disabled if numberMotor = 2)

Try _{numberMotor-2}_

> [@Jorgeibesi](#):
>
> (tag reference) motorType\> value (point to nomberMotor)

Use an expression tag instead.

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<div class="post-metadata">

**Author:** ![Jorgeibesi](https://avatars.discourse-cdn.com/v4/letter/j/ba9def/32.png) [@Jorgeibesi](https://forum.inductiveautomation.com/u/Jorgeibesi)\
**Post date:** [January 31, 2020, 12:54pm UTC](https://forum.inductiveautomation.com/t/tag-reference-to-a-parameter-in-a-udt/31769/4 "2020-01-31T12:54:23Z")

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Thank you very much. I had already fix the problem with Expression Tag instead of Reference tag. But I couldn’t disabled the tag . I’ve tried _{numberMotor-2}_ but doesn’t work.

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**Author:** ![JordanCClark](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jordancclark/32/83362_2.png) [@JordanCClark](https://forum.inductiveautomation.com/u/JordanCClark)\
**Post date:** [January 31, 2020, 1:18pm UTC](https://forum.inductiveautomation.com/t/tag-reference-to-a-parameter-in-a-udt/31769/5 "2020-01-31T13:18:16Z")

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Just verified on my system that it works in 8.0.7.

[JCMotorUDT.json](https://us1.discourse-cdn.com/inductiveautomation/original/2X/4/49b4d2294485a67e4e0194c41821ecdcddbdc005.json) (535 Bytes)

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<div class="post-metadata">

**Author:** ![Jorgeibesi](https://avatars.discourse-cdn.com/v4/letter/j/ba9def/32.png) [@Jorgeibesi](https://forum.inductiveautomation.com/u/Jorgeibesi)\
**Post date:** [February 3, 2020, 7:58am UTC](https://forum.inductiveautomation.com/t/tag-reference-to-a-parameter-in-a-udt/31769/6 "2020-02-03T07:58:46Z")

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Thank you very much Jordan. It works for me now. Is it possible do the same with strings? I think no, but perhaps you know. Thanks one more time, I didn’t find the solution with numbers anywhere.

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**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:** [February 3, 2020, 8:55am UTC](https://forum.inductiveautomation.com/t/tag-reference-to-a-parameter-in-a-udt/31769/7 "2020-02-03T08:55:39Z")

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Nope you can’t do this with string parameters

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**Author:** ![Jorgeibesi](https://avatars.discourse-cdn.com/v4/letter/j/ba9def/32.png) [@Jorgeibesi](https://forum.inductiveautomation.com/u/Jorgeibesi)\
**Post date:** [February 3, 2020, 10:56am UTC](https://forum.inductiveautomation.com/t/tag-reference-to-a-parameter-in-a-udt/31769/8 "2020-02-03T10:56:51Z")

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Thanks for the immediat answer.

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<div class="post-metadata">

**Author:** ![Jorgeibesi](https://avatars.discourse-cdn.com/v4/letter/j/ba9def/32.png) [@Jorgeibesi](https://forum.inductiveautomation.com/u/Jorgeibesi)\
**Post date:** [February 4, 2020, 9:38am UTC](https://forum.inductiveautomation.com/t/tag-reference-to-a-parameter-in-a-udt/31769/10 "2020-02-04T09:38:28Z")

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Is possible to put an OR? Like {numberMotor- 2} | {numberMotor- 3}