OPC-UA-SPEC

IEC 62541 OPC UA industrial standard.

Definition

OPC UA main components: Address Space (info hierarchy nodes/references/data types), Services (Read, Write, Browse, Call, Subscribe, etc.), Transport (UA TCP, HTTPS, WebSocket), Security (Sign, Sign+Encrypt, X.509 certificates), Companion Specifications (~60 published: AutoID, PackML, Robotics, EUROMAP, etc.). SDKs available in ~12 languages: C, C++, Java, .NET, Python, JavaScript, Rust. ISA/IEC 62443 cybersecurity aligned.

Origin

OPC UA v1.00 published by OPC Foundation 2008 ; IEC 62541 published 2010 ; multiple versions and companion specifications to date.

Example in context

A Siemens SIMATIC PLC factory publishes its tags via OPC UA server ; Wonderware Foxboro SCADA connects 2000 tags via OPC UA TCP with X.509 certificate authentication.

Related terms

• OPC UA PubSub — event-driven extension.