# Equation

The Equation Data Connector allows for creating calculated measurements at the Edge by combining existing tags with symbolic expressions.

Instead of connecting to a device or protocol, this connector acts as a *virtual source* that evaluates formulas locally and exposes the results as measurements.

{% hint style="info" %}
Adding the Equation Data Connector is not necessary. It is added by default, and therefore always available across the entire Asset Hierarchy.
{% endhint %}

### When to use Equations

There are many applications for using tags with symbolic equations.

Examples are:

* Unit conversions (e.g., °C → °F, bar → kPa).
* Derived KPIs (cycle time, yield, OEE components).
* Sensor fusion (combine multiple inputs).
* Conditional logic (fallbacks, clamping, bad-data handling).

### Triggering

Tags with equations work like any other tag, supporting both configurable sampling and aggregation.

Sampling is controlled by setting the Read Sampling Interval for the tag. The following modes are available:

* **On change:** Recalculate when any input tag changes.
* **Interval:** Recalculate on a fixed schedule (e.g., every 1 s, 5 s, 60 s).

### Syntax

To configure a tag as a symbolic equation, please refer to the tag configuration section for a guide to configure a equation tag.

[Equation Editor documenation](/management-portal/designer/assets/tags/collect/configuration/equation.md)


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