# Trouble with Tag Event Script on Value Change

**URL:** <https://forum.inductiveautomation.com/t/trouble-with-tag-event-script-on-value-change/115274>\
**Category:** Ignition\
**Tags:** scripting\
**Created:** [April 27, 2026, 11:13pm UTC](https://forum.inductiveautomation.com/t/trouble-with-tag-event-script-on-value-change/115274 "2026-04-27T23:13:24Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![mdemaris](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mdemaris/32/54639_2.png) [@mdemaris](https://forum.inductiveautomation.com/u/mdemaris)\
**Post date:** [April 27, 2026, 11:13pm UTC](https://forum.inductiveautomation.com/t/trouble-with-tag-event-script-on-value-change/115274/1 "2026-04-27T23:13:24Z")

</div>

I would like to call a project script from a tag value change event, but it does not look like the value changed even fires. I have tried changing the name of the function to something non-existent, hoping for an error, but get nothing. I have tried changing the value of another memory tag, and get nothing.  
This should be so simple but has me stumped. (Small caveat: this is Monday, so...)

```python
	if previousValue and currentValue:
		value = currentValue.value
		system.tag.writeBlocking(["[default]Testing Tags/Temp_Data/ID"], [value])

```

This simple script should work, right???

```python
	if previousValue and currentValue:
		value = currentValue.value
		scriptLibrary.package.script.func01(value)

```

Should work?

---

<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [April 27, 2026, 11:14pm UTC](https://forum.inductiveautomation.com/t/trouble-with-tag-event-script-on-value-change/115274/2 "2026-04-27T23:14:51Z")

</div>

This is only possible for scripts residing in the configured Gateway Scripting Project: [Project Library | Ignition User Manual](https://docs.inductiveautomation.com/docs/8.1/platform/scripting/scripting-in-ignition/project-library#gateway-scripting-project)

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<div class="post-metadata">

**Author:** ![mdemaris](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mdemaris/32/54639_2.png) [@mdemaris](https://forum.inductiveautomation.com/u/mdemaris)\
**Post date:** [April 27, 2026, 11:23pm UTC](https://forum.inductiveautomation.com/t/trouble-with-tag-event-script-on-value-change/115274/3 "2026-04-27T23:23:45Z")

</div>

Yep, got that.

But, um, I just figured it out. I did not see that "Enabled" checkbox in the upper right... 🤦‍♂️  
I hate Mondays, 😅