# What are Edge Nodes? ## **What are Edge Nodes?** **Edge Nodes** play a central role in modern **building automation** and **IoT architecture**. They are devices or software solutions that **collect and process data directly where it is generated**β€”at the so-called "edge" of the network, close to sensors, machines, or controls. The pre-processed and relevant information is then forwarded to central systems like **Eliona**.
## **How do Edge Nodes work?** Edge Nodes are physically or logically located **near the data sources**, e.g., in buildings or industrial facilities. They collect **measured values and status information** from existing devices, process them locally, and then transfer them to Eliona via supported interfaces (e.g., **BACnet**, **Modbus**, or **MQTT**). Edge Nodes can: * **Buffer data** to ensure secure and efficient transmission. * **Evaluate and filter data** before it is forwarded. * In some cases, even **take over local control tasks** (depending on the model). *** ## **Why are Edge Nodes used?** Edge Nodes are essential to enable **efficient, flexible, and scalable data processing** in IoT systems. They offer numerous advantages: * **Reduced latency**: Data is processed locally, which minimizes delays. * **Efficiency**: Only relevant information is sent to the cloud or central platforms like Eliona, which saves network bandwidth. * **Fast response times**: Actions can be triggered directly at the source without waiting for central systems. * **IT security**: Sensitive data remains local and does not have to be transferred entirely to the cloud. ## **Example: Use in Building Automation** An Edge Node is installed in a building and connected to existing HVAC systems (heating, ventilation, air conditioning) via **Modbus**. It collects data such as **temperature, humidity, and energy consumption**, pre-filters it, and sends only the necessary information to Eliona. In Eliona, this data can: * Be **visualized** to analyze trends. * Trigger **automations**, such as adjusting ventilation parameters. * Create **alerts** if limit values are exceeded. *** {% hint style="info" %} You can find out more about how and which Edge Nodes can be connected to Eliona in the next chapters: [β†’ Edge Nodes in Eliona ](https://docs.buildings.ability.abb/collection/edge-nodes/edgenodes-in-abb-buildingpro) [β†’ Set up Control Edge ](https://docs.buildings.ability.abb/collection/edge-nodes/edgenodes-in-abb-buildingpro/set-up-control-edge) β†’ Set up Gateway Edge {% endhint %}