# How to read UDT instance parameter values from a script (Ignition 8.3)

**URL:** <https://forum.inductiveautomation.com/t/how-to-read-udt-instance-parameter-values-from-a-script-ignition-8-3/117637>\
**Category:** Ignition\
**Tags:** perspective, scripting\
**Created:** [October 28, 2026, 11:28am UTC](https://forum.inductiveautomation.com/t/how-to-read-udt-instance-parameter-values-from-a-script-ignition-8-3/117637 "2026-10-28T11:28:01Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![m\_tanaka](https://avatars.discourse-cdn.com/v4/letter/m/8dc957/32.png) [@m\_tanaka](https://forum.inductiveautomation.com/u/m_tanaka)\
**Post date:** [October 28, 2026, 11:28am UTC](https://forum.inductiveautomation.com/t/how-to-read-udt-instance-parameter-values-from-a-script-ignition-8-3/117637/1 "2026-10-28T11:28:01Z")

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I would like to get the parameter values set on each UDT instance using a script.

**Environment**

- Ignition 8.3.0 (b2025091510)
- Run in a Perspective transform and in the Script Console

I tried the following, but could not get the data. How can I get these values with a script?

1. `system.tag.getConfiguration`
2. `system.tag.readBlocking([instancePath + ".Parameters"])[0].value`
3. `system.tag.browse(instancePath + "/Parameters").getResults()`

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**Author:** ![Samuel\_Sueur](https://avatars.discourse-cdn.com/v4/letter/s/e36b37/32.png) [@Samuel\_Sueur](https://forum.inductiveautomation.com/u/Samuel_Sueur)\
**Post date:** [October 28, 2026, 11:47am UTC](https://forum.inductiveautomation.com/t/how-to-read-udt-instance-parameter-values-from-a-script-ignition-8-3/117637/2 "2026-10-28T11:47:02Z")

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If you want to do this via `system.tag.readBlocking`, you have to know the name of the parameter you're trying to read.

`system.tag.readBlocking([instancePath + "/Parameters.myParam"])[0].value`

Note the `.myParam` in my example above.

`.getConfiguration` should also give you the param values, ~~but I think it will only give you the overriden parameters (not tested)~~, not true, you can get the parameters via the `parameters` key, even the ones not overriden.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/c/5/c5cbe3c424e2c28f2508ef70bbcfd96b80e9f33c.png)

Never tried `.browse` to read parameter values, but I don't think this works.

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**Author:** ![Noah\_Burnette](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/noah_burnette/32/83777_2.png) [@Noah\_Burnette](https://forum.inductiveautomation.com/u/Noah_Burnette)\
**Post date:** [October 28, 2026, 11:54am UTC](https://forum.inductiveautomation.com/t/how-to-read-udt-instance-parameter-values-from-a-script-ignition-8-3/117637/3 "2026-10-28T11:54:52Z")

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Hello,

Just putting this here as it related to parameter access. You can also access the parameters in a tag event script as well via:

```python
def valueChanged(tag, tagPath, previousValue, currentValue, initialChange, missedEvents):
    tag["parameters"]["myParam"] 

```

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<div class="post-metadata">

**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\
**Post date:** [October 28, 2026, 9:41pm UTC](https://forum.inductiveautomation.com/t/how-to-read-udt-instance-parameter-values-from-a-script-ignition-8-3/117637/4 "2026-10-28T21:41:19Z")

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You can do this with `readblocking`.

However, something to consider - there are _many_ times that I need to display the parameters of and instance in a template that is built for that UDT. I have made it a habit of having a "param" folder in every UDT that simply has one tag for every parameter and binds to each one. Then you just read/bind it like any other tag.

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<div class="post-metadata">

**Author:** ![Nol](https://avatars.discourse-cdn.com/v4/letter/n/8e8cbc/32.png) [@Nol](https://forum.inductiveautomation.com/u/Nol)\
**Post date:** [October 28, 2026, 9:45pm UTC](https://forum.inductiveautomation.com/t/how-to-read-udt-instance-parameter-values-from-a-script-ignition-8-3/117637/5 "2026-10-28T21:45:53Z")

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Why that over an indirect binding directly to the parameter?

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<div class="post-metadata">

**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\
**Post date:** [October 28, 2026, 9:47pm UTC](https://forum.inductiveautomation.com/t/how-to-read-udt-instance-parameter-values-from-a-script-ignition-8-3/117637/6 "2026-10-28T21:47:01Z")

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No real reason I can remember atm. I don't recall if the parameters show up in the tag binding selection dialog or not