UNE-EN IEC 62541-2:2026

This part of IEC 62541 describes the OPC Unified Architecture (OPC UA) security model. It describes the security threats of the physical, hardware, and software environments in whichOPC UA is expected to run. It describes how OPC UA relies upon other standards for security. It provides definition of common security terms that are used in this and other parts of theIEC 62541 series. It gives an overview and concept of the security features that are specified in other parts of the series. It references services, mappings, and Profiles that are specifiednormatively in other parts of the 62541 series. It provides suggestions or best practice guidelines on implementing security. Any seeming ambiguity between this document and oneof the other normative parts does not remove or reduce the requirement specified in the other normative part.Note that there are many different aspects of security that have to be addressed when developing applications. However, since OPC UA specifies a communication protocol, the focusis on securing the data exchanged between applications. This does not mean that an application developer can ignore the other aspects of security like protecting persistent data againsttampering. It is important that the developers look into all aspects of security and decide how they can be addressed in the application.This document is directed to readers who will develop OPC UA applications. It is also for end Users that wish to understand the various security features and functionality provided by OPCUA. It also offers some recommendations that can be applied when deploying systems. These recommendations are generic in nature since the details would depend on the actualimplementation of the OPC UA applications and the choices made for the site security.