IEC TR 62541-1-2020 PDF

Full title and description

St IEC TR 62541-1:2020 — OPC unified architecture - Part 1: Overview and concepts. This technical report presents high-level concepts, architecture models and guidance for understanding the remainder of the IEC 62541 (OPC UA) multipart series; it is intended as an introductory and navigational document for implementers and stakeholders.

Abstract

IEC TR 62541-1:2020 provides an overview of the OPC Unified Architecture (OPC UA), describes core concepts (address space, information modelling, services, security and communication patterns such as Client/Server and PubSub) and briefly explains the purpose and recommended reading order of the other parts in the IEC 62541 series. It aims to give readers the conceptual background needed to use and interpret the normative parts of the OPC UA standard family.

General information

• Status: Replaced / withdrawn as a Technical Report; superseded by IEC 62541-1:2025 (new edition as an International Standard).
• Publication date: 18 November 2020.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 25.040.40; 35.100.01.
• Edition / version: Edition 3.0 (Ed. 3).
• Number of pages: 28.

(Publication and status information as published in the IEC product catalogue and national standard bodies.)

Scope

IEC TR 62541-1:2020 is a non-normative Technical Report that presents the high-level concepts and overview of OPC UA to help readers understand and navigate the other, normative parts of the IEC 62541 series. It describes the roles of the major parts (address space model, services, information models, mappings, profiles, data access, alarms & conditions, historical access, discovery and PubSub) and provides a suggested reading order for implementers.

Key topics and requirements

• Overview of OPC UA architecture and core concepts (information modelling, nodes and address space).
• Summary of communication patterns: Client/Server and PubSub and their typical applications.
• Conceptual description of security model and references to normative security parts.
• Guidance on how the various IEC 62541 parts relate and recommended reading order for implementers.
• References to normative parts and external standards that OPC UA relies on (e.g., X.509, IETF RFCs) — primarily a conceptual, non-normative mapping rather than prescriptive requirements.

Typical use and users

This Technical Report is aimed at systems architects, control and automation engineers, software developers, integration specialists, project managers and technical decision-makers who need a concise conceptual introduction to OPC UA before diving into the detailed normative parts. It is useful for training, requirements planning and early-stage design work.

Related standards

IEC TR 62541-1 is the introductory part of the IEC 62541 (OPC UA) series. Other parts in the series include (but are not limited to) Part 2 (Security Model), Part 3 (Address Space Model), Part 4 (Services), Part 5 (Information Model), Part 6 (Mappings), Part 7 (Profiles), Part 8 (Data Access), Part 9 (Alarms & Conditions), Part 10 (Programs), Part 11 (Historical Access), Part 12 (Discovery and Global Services), Part 13 (Aggregates) and Part 14 (PubSub). The 2020 TR edition has been superseded by IEC 62541-1:2025.

Keywords

OPC UA, OPC Unified Architecture, overview, concepts, information model, address space, services, PubSub, data access, alarms and conditions, discovery, industrial interoperability, IEC 62541.

FAQ

Q: What is this standard?

A: IEC TR 62541-1:2020 is a Technical Report that gives an overview and conceptual introduction to the OPC Unified Architecture (OPC UA) family of standards.

Q: What does it cover?

A: It covers high-level concepts and architecture of OPC UA, explains how the parts of the IEC 62541 series relate to each other, and provides guidance on which parts to read for specific topics (security, address space, services, Data Access, PubSub, etc.). It is non‑normative—intended for understanding rather than specifying implementation details.

Q: Who typically uses it?

A: System architects, integration engineers, control/automation developers, technical managers and others who need a conceptual grounding in OPC UA before consulting the normative parts.

Q: Is it current or superseded?

A: The 2020 TR edition was published 18 November 2020 and has been superseded by IEC 62541-1:2025 (the new edition/International Standard). Users should consult the 2025 edition for the current, normative consolidated text.

Q: Is it part of a series?

A: Yes — it is Part 1 (overview) of the multipart IEC 62541 series that defines OPC UA (multiple Parts covering security, address space, services, mappings, profiles, data access, alarms, PubSub, historical access, discovery, etc.).

Q: What are the key keywords?

A: OPC UA, OPC Unified Architecture, overview, information model, address space, services, PubSub, data access, security.