# Change tag ParameterValue **URL:** \ **Category:** Ignition\ **Tags:** ignition80\ **Created:** [September 23, 2020, 3:40pm UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982 "2020-09-23T15:40:16Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![flavien](https://avatars.discourse-cdn.com/v4/letter/f/f475e1/32.png) [@flavien](https://forum.inductiveautomation.com/u/flavien)\ **Post date:** [September 23, 2020, 3:40pm UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/1 "2020-09-23T15:40:16Z")
Hi, I would like to change a ParameterValue I’ve called “nb\_hours” in a UDT instance tag. Example : ```auto configs = system.tag.getConfiguration("[test]pathtomytag",True) configs[0]['parameters']['nb_hours']['value']=5 ``` I have an error “‘com.inductiveautomation.ignition.common.tags.config.properties.ParameterValue’ object is unsubscriptable”. Can you help me ? ---
**Author:** ![bpreston](https://avatars.discourse-cdn.com/v4/letter/b/4af34b/32.png) [@bpreston](https://forum.inductiveautomation.com/u/bpreston)\ **Post date:** [September 23, 2020, 4:46pm UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/2 "2020-09-23T16:46:31Z")
When you run system.tag.getConfiguration, it returns a list of tag dictionaries related to your tag. You can’t just write back to that list. You can take that list and modify it then use [system.tag.configure()](https://docs.inductiveautomation.com/display/DOC80/system.tag.configure) to write back to your tag. The last example in system.tag.configure looks close to what you were trying to do there except you added [‘value’] to it so I’m assuming you have more to your script your not sharing? ---
**Author:** ![flavien](https://avatars.discourse-cdn.com/v4/letter/f/f475e1/32.png) [@flavien](https://forum.inductiveautomation.com/u/flavien)\ **Post date:** [September 24, 2020, 8:59am UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/3 "2020-09-24T08:59:16Z")
Thanks It's not for UDT Definitions but for UDT instances. Below my try : ```auto path="[test]pathtomytag" configs = system.tag.getConfiguration(path) configs[0]['parameters']['nb_hours']=5 print configs[0]['parameters'] system.tag.configure(path, configs, 'o') ``` Return : > {u'device\_id': {datatype=String, value=17}, u'nb\_hours': 5, u'serial\_number': {datatype=String, value=null}, u'device\_name': {datatype=String, value=null}, u'database': {datatype=String, value='db'}, u'project\_id': {datatype=String, value=2}} > [Bad\_Unsupported("The target path '[test]pathtomytag' does not have item 'pathtomytag' for overrides, and cannot accept children tags.")] ---
**Author:** ![bpreston](https://avatars.discourse-cdn.com/v4/letter/b/4af34b/32.png) [@bpreston](https://forum.inductiveautomation.com/u/bpreston)\ **Post date:** [September 24, 2020, 1:22pm UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/4 "2020-09-24T13:22:00Z")
I don’t have an 8.0 system in front of me right now to try it out but what about something like: ```auto path="[test]pathtomytag" param = {"parameters":{"nb_hours":5}} system.tag.configure(path,[param],"m") ``` Instead of trying to update everything about it, I’m just specifying the parameter you want to change and then using the “m”(merge) collisionPolicy. ---
**Author:** ![flavien](https://avatars.discourse-cdn.com/v4/letter/f/f475e1/32.png) [@flavien](https://forum.inductiveautomation.com/u/flavien)\ **Post date:** [September 25, 2020, 7:21am UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/5 "2020-09-25T07:21:11Z")
With your code I have : [Error\_Configuration] ---
**Author:** ![flavien](https://avatars.discourse-cdn.com/v4/letter/f/f475e1/32.png) [@flavien](https://forum.inductiveautomation.com/u/flavien)\ **Post date:** [December 4, 2020, 12:07pm UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/6 "2020-12-04T12:07:39Z")
Hi, My script still not work. I didn’t found any solution for instance. Do you have a solution ? ---
**Author:** ![flavien](https://avatars.discourse-cdn.com/v4/letter/f/f475e1/32.png) [@flavien](https://forum.inductiveautomation.com/u/flavien)\ **Post date:** [April 9, 2021, 7:52am UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/7 "2021-04-09T07:52:01Z")
Hi, Do I have to upgrade Ignition to fix this problem ? Thanks, ---
**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:** [April 9, 2021, 10:45am UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/8 "2021-04-09T10:45:09Z")
Pretty sure you need to pass the parent path to configure, not the path to the actual tag Here we go ![Screenshot_20210409-201659_Chrome](https://us1.discourse-cdn.com/inductiveautomation/original/3X/c/0/c01ca4ab1095a5a54edb4a524254fe8aa3ba307f.jpeg) EG set basePath to `'/'.join(path.split('/')[:-1])` You could probably also use a proper tag path library to get the parent path as well… Just in case your tagpath doesn’t contain any folders ---
**Author:** ![mpaulson745](https://avatars.discourse-cdn.com/v4/letter/m/fbc32d/32.png) [@mpaulson745](https://forum.inductiveautomation.com/u/mpaulson745)\ **Post date:** [August 18, 2021, 2:05pm UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/9 "2021-08-18T14:05:13Z")
I had the same issue in a script I wrote before Inductive added datatypes to UDT parameters. You can no longer just assign a value directly to a parameter. You’ll need to use the “setValue” method. So change your script to this: ```auto configs[0]['parameters']['nb_hours'].setValue(5) ``` ---
**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:** [August 18, 2021, 5:11pm UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/10 "2021-08-18T17:11:25Z")
The other thing is that you can simply write to the UDT instances’ parameters directly using `system.tag.writeBlocking(['path/UDTInstance/Parameters.Param1'], [10])` ---
**Author:** ![Eugene49](https://avatars.discourse-cdn.com/v4/letter/e/c6cbf5/32.png) [@Eugene49](https://forum.inductiveautomation.com/u/Eugene49)\ **Post date:** [May 23, 2025, 8:15pm UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/11 "2025-05-23T20:15:18Z")
> [@nminchin](#): > > The other thing is that you can simply write to the UDT instances’ parameters directly using `system.tag.writeBlocking(['path/UDTInstance/Parameters.Param1'], [10])` This is nice if it work, but I got error: ```python File "", line 14, in runAction ValueError: Invalid path element '[default]B100/Water_Table2.Parameters.OpcServer': Token PROPERTY_SEPARATOR found after property name. ``` ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [May 23, 2025, 8:16pm UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/12 "2025-05-23T20:16:23Z")
`path/UDTInstance/Parameters.NameOfParameter`, **not** `path/UDTInstance.Parameters.NameOfParameter`. You can only have one `.` separating elements in a tag path. ---
**Author:** ![Eugene49](https://avatars.discourse-cdn.com/v4/letter/e/c6cbf5/32.png) [@Eugene49](https://forum.inductiveautomation.com/u/Eugene49)\ **Post date:** [May 23, 2025, 8:18pm UTC](https://forum.inductiveautomation.com/t/change-tag-parametervalue/38982/13 "2025-05-23T20:18:26Z")
That is Awesome!