# OPC Unified Architecture (OPC-UA)

**Canonical:** https://apis.io/apis/scada/opc-ua/  
**Provider:** SCADA — https://apis.io/providers/scada/  
**Documentation:** https://opcfoundation.org/about/opc-technologies/opc-ua/

OPC Unified Architecture (OPC-UA) is one of 5 APIs that [SCADA](https://apis.io/providers/scada/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include IEC 62541, Industrial Interoperability, OPC UA, and Real-Time Data. The published artifact set on APIs.io includes API documentation.

OPC-UA (IEC 62541) is the industrial interoperability standard for secure, reliable data exchange in industrial automation and IoT environments. It provides a platform-independent, service-oriented architecture for accessing real-time and historical data from PLCs, sensors, and SCADA systems. OPC-UA supports both client/server and pub/sub communication models.

## Machine-readable artifacts (3)

- **Documentation** — https://opcfoundation.org/about/opc-technologies/opc-ua/
- **Specification** — https://reference.opcfoundation.org/Core/Part1/v105/docs/
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/scada/refs/heads/main/apis.yml

## Other SCADA APIs (4)

- [MQTT Protocol](https://apis.io/apis/scada/mqtt/)
- [Modbus Protocol](https://apis.io/apis/scada/modbus/)
- [Ignition SCADA REST API](https://apis.io/apis/scada/ignition-api/)
- [Historian and Alarm Data APIs](https://apis.io/apis/scada/had-api/)

## Tags

IEC 62541, Industrial Interoperability, OPC UA, Real-Time Data

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/scada/opc-ua/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/scada/.