# Perspective Map/Transform (Linking Output to a Tag)

**URL:** <https://forum.inductiveautomation.com/t/perspective-map-transform-linking-output-to-a-tag/32945>\
**Category:** Ignition\
**Tags:** perspective\
**Created:** [March 9, 2020, 9:04pm UTC](https://forum.inductiveautomation.com/t/perspective-map-transform-linking-output-to-a-tag/32945 "2020-03-09T21:04:28Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![jaspinall](https://avatars.discourse-cdn.com/v4/letter/j/a587f6/32.png) [@jaspinall](https://forum.inductiveautomation.com/u/jaspinall)\
**Post date:** [March 9, 2020, 9:04pm UTC](https://forum.inductiveautomation.com/t/perspective-map-transform-linking-output-to-a-tag/32945/1 "2020-03-09T21:04:28Z")

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Hi All,

Is it possible in Map/Transform to link the “Output” to a Tag? I see if I switch my “Output Type” to “Expression” it does give me the ability to link a tag via the “fx” function that appears… however it doesnt seem to work and throws out an error.

Is it possible to do this?

Thank You

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/7/768153a8e3c6d68eb05519ea97465edd60308ffe.png)

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**Author:** ![jspecht](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jspecht/32/6465_2.png) [@jspecht](https://forum.inductiveautomation.com/u/jspecht)\
**Post date:** [March 9, 2020, 9:13pm UTC](https://forum.inductiveautomation.com/t/perspective-map-transform-linking-output-to-a-tag/32945/2 "2020-03-09T21:13:00Z")

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Have you tried the [tag expression function](https://docs.inductiveautomation.com/display/DOC80/tag)?

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<div class="post-metadata">

**Author:** ![jaspinall](https://avatars.discourse-cdn.com/v4/letter/j/a587f6/32.png) [@jaspinall](https://forum.inductiveautomation.com/u/jaspinall)\
**Post date:** [March 9, 2020, 9:17pm UTC](https://forum.inductiveautomation.com/t/perspective-map-transform-linking-output-to-a-tag/32945/3 "2020-03-09T21:17:53Z")

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Hi @jspecht - yes we tried the tag() expression function but for some reason it throws an error? Just wondering if this is maybe a bug or something not intended to work?

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<div class="post-metadata">

**Author:** ![jaspinall](https://avatars.discourse-cdn.com/v4/letter/j/a587f6/32.png) [@jaspinall](https://forum.inductiveautomation.com/u/jaspinall)\
**Post date:** [March 9, 2020, 9:28pm UTC](https://forum.inductiveautomation.com/t/perspective-map-transform-linking-output-to-a-tag/32945/4 "2020-03-09T21:28:36Z")

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Updated with a picture of the error. If anyone sees anything from with our tag() syntax please let me know.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/0/05d05ca5b02567659497be895eaa5856b0a85589.png)

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<div class="post-metadata">

**Author:** ![jspecht](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jspecht/32/6465_2.png) [@jspecht](https://forum.inductiveautomation.com/u/jspecht)\
**Post date:** [March 9, 2020, 9:30pm UTC](https://forum.inductiveautomation.com/t/perspective-map-transform-linking-output-to-a-tag/32945/5 "2020-03-09T21:30:15Z")

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Your output expressions for input values 0, 1, and 2 are not valid expressions (they look empty)

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<div class="post-metadata">

**Author:** ![jaspinall](https://avatars.discourse-cdn.com/v4/letter/j/a587f6/32.png) [@jaspinall](https://forum.inductiveautomation.com/u/jaspinall)\
**Post date:** [March 9, 2020, 9:34pm UTC](https://forum.inductiveautomation.com/t/perspective-map-transform-linking-output-to-a-tag/32945/6 "2020-03-09T21:34:40Z")

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Thanks @jspecht ! That was our issue.