# Data Type Instance scanclass

**URL:** <https://forum.inductiveautomation.com/t/data-type-instance-scanclass/8563>\
**Category:** Ignition\
**Created:** [June 13, 2014, 11:05am UTC](https://forum.inductiveautomation.com/t/data-type-instance-scanclass/8563 "2014-06-13T11:05:40Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![quper](https://avatars.discourse-cdn.com/v4/letter/q/aeb1de/32.png) [@quper](https://forum.inductiveautomation.com/u/quper)\
**Post date:** [June 13, 2014, 11:05am UTC](https://forum.inductiveautomation.com/t/data-type-instance-scanclass/8563/1 "2014-06-13T11:05:40Z")

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Hello,

Is it possible to link Data Type Instance parameter as a scanclass for tags, the same way as it is possible to do with OPC item path?

For example I have Data Type Instance and string parameter “OPCpath”.  
It is possible to link tag path inside Data Type Instance to this parameter as: {OPCpath}.Flag.Alarms\_PE1\_4mA and it is working good.

Also I have string parameter “ObjectScanclass” and trying to link it to tag scanclass field the same way:  
{ObjectScanclass}, but it does not work.

Am I doing it wrong or it is not currently possible?

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**Author:** ![quper](https://avatars.discourse-cdn.com/v4/letter/q/aeb1de/32.png) [@quper](https://forum.inductiveautomation.com/u/quper)\
**Post date:** [June 27, 2014, 5:32am UTC](https://forum.inductiveautomation.com/t/data-type-instance-scanclass/8563/2 "2014-06-27T05:32:51Z")

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Any thoughts?

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**Author:** ![joe.tamaki](https://avatars.discourse-cdn.com/v4/letter/j/cdc98d/32.png) [@joe.tamaki](https://forum.inductiveautomation.com/u/joe.tamaki)\
**Post date:** [October 29, 2014, 12:18am UTC](https://forum.inductiveautomation.com/t/data-type-instance-scanclass/8563/3 "2014-10-29T00:18:44Z")

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The Inductive University says it is possible to pass Scan Class as a parameter into a UDT. It was one of the questions, and the answer was that it is possible. So that is encouraging. But I don’t how to do it.

 ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/a/a6ffe78610e44314f692d8d85b950970d13a210c.jpg)

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**Author:** ![anna](https://avatars.discourse-cdn.com/v4/letter/a/779978/32.png) [@anna](https://forum.inductiveautomation.com/u/anna)\
**Post date:** [November 19, 2014, 5:38pm UTC](https://forum.inductiveautomation.com/t/data-type-instance-scanclass/8563/4 "2014-11-19T17:38:42Z")

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Parameterizing a UDT member’s scan class is supposed to work - but unfortunately was discovered to be broken. The issue has been fixed for 7.7.2. We are sorry about the confusion this has caused.

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**Author:** ![quper](https://avatars.discourse-cdn.com/v4/letter/q/aeb1de/32.png) [@quper](https://forum.inductiveautomation.com/u/quper)\
**Post date:** [December 4, 2014, 9:29am UTC](https://forum.inductiveautomation.com/t/data-type-instance-scanclass/8563/5 "2014-12-04T09:29:56Z")

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Thank you!

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<div class="post-metadata">

**Author:** ![GreggCavazos](https://avatars.discourse-cdn.com/v4/letter/g/90db22/32.png) [@GreggCavazos](https://forum.inductiveautomation.com/u/GreggCavazos)\
**Post date:** [October 1, 2019, 1:25pm UTC](https://forum.inductiveautomation.com/t/data-type-instance-scanclass/8563/6 "2019-10-01T13:25:47Z")

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I am running 7.9.12, we are trying to parameterize the scanclass property, but it doesn’t seem to be working, what am I doing wrong?

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/0/039225dde5b2d8213c6adddf821f7879dd8a19c0.png)

![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/e/e7204344f9ee4b2c5ae0c365b615e25352bb5f32.png)

when I create a UDT tag, the scanclass its not using the definition.  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/1/1b37a912365c301f365167c40bd29f49b21e8b53.png)

Thanks,