> For the complete documentation index, see [llms.txt](https://docs.monokot.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.monokot.io/basics/opc-ua.md).

# OPC UA

To interact with external systems (such as SCADA), the server implements the data access features via OPC UA. OPC UA – is a modern technology for communication in the fields of industrial automation, Internet of Things (IoT), etc. Technology provides opportunities for encryption of transmitted data and authentication/authorization of users. Available features and OPC UA settings are described below.