> For the complete documentation index, see [llms.txt](https://help.tillit.cloud/tillit/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.tillit.cloud/tillit/knowledge-base/setting-up-tillit/edge/data-tags.md).
# Data Tags
Now that you have a data source and it is connected, you can start adding data tags.
An Edge Data Tag represents the smallest data mapping unit in TilliT Edge, linking a source variable or memory address \[*Source Address]* and its data type \[*Source Data Type*] directly to a specific asset \[*Asset*]. It allows for real-time data transformations and logic application through scale options \[*scale*], counter overflow handling \[*rollover]*, or evaluation expressions \[*RTLE*]. Each tag is configured using essential attributes, including name, asset association, source address, source data type, and optional templates or process variables.
## Navigation
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Go to **Settings > Edge > Data Tags or Settings > Edge > Data Sources**, then select the relevant **Data Source**, and locate the **Edge Data Tag** panel, and click to open.
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## Creating a Data Tag
{% stepper %}
{% step %}
Click **Create**.
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{% step %}
In the modal fill in the required fields.
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{% step %}
Click Save and open.
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Your new Edge Data Tag has now been created, but has not been sent to the edge as indicated by the blue symbol as the status. To do this, click the **Publish Configuration** button on the selected edge
Wait for the Edge to report back. If all is good, then the status symbol will update to a green tick and you will see a last value populate, confirm this value is as expected. If the read failed, then a red symbol will show the cause of the failure by hovering over the status.\
### Fields
| Name | Description |
| ------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Name \* | enter a name for the Data Tag. |
| Data Source | Select an existing Data Source associated with this tag from the list, or click the + icon to create a new one. |
| Asset \* | the asset that this data tag belongs to |
| Source Adress | the address of the data tag on the source. (This depends on the data source type, for more details on how to set the source addresses, review this article [here](https://help.tillit.cloud/article/117-datasource-addressing)). |
| Source Data Type | whether the data tag is a boolean (digital), number or string (text) |
| Template | how TilliT should interpret this data tag. Read more on templates [here](/tillit/knowledge-base/setting-up-tillit/edge/data-tags/data-tag-templates.md). |
| Process Variable | if you set a process variable, TilliT will store the data value as a time series. Read more on this [here](https://secure.helpscout.net/docs/60209ebeac2f834ec5386405/article/603afd0b0a2dae5b58fb41e2/Process%20Variable). |
| Movement Type | Select the Movement Type associated with this data tag. |
| Template Assignment | Select the Template Assignment associated with this data tag. |
| Active | If you want to include this tag in the poll cycle. Setting to inactive will cause the edge to not read the tag. |
| Options | special configuration tools that allow you can set to define advanced behavior. If your value has a rollover, then this can help, see [here](https://help.tillit.cloud/article/162-edge-data-tag-options). |
