25.040.40 - Industrial process measurement and control
ICS 25.040.40 Details
Industrial process measurement and control
Proze?technik (Me?- und Steuertechnik fur Verfahren)
Mesure et contrôle des processus industriels
Merjenje in krmiljenje industrijskih postopkov
General Information
Frequently Asked Questions
ICS 25.040.40 is a classification code in the International Classification for Standards (ICS) system. It covers "Industrial process measurement and control". The ICS is a hierarchical classification system used to organize international, regional, and national standards, facilitating the search and identification of standards across different fields.
There are 2790 standards classified under ICS 25.040.40 (Industrial process measurement and control). These standards are published by international and regional standardization bodies including ISO, IEC, CEN, CENELEC, and ETSI.
The International Classification for Standards (ICS) is a hierarchical classification system maintained by ISO to organize standards and related documents. It uses a three-level structure with field (2 digits), group (3 digits), and sub-group (2 digits) codes. The ICS helps users find standards by subject area and enables statistical analysis of standards development activities.
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This part of IEC 63082 defines the concepts and terminology necessary to understand and communicate effectively about intelligent device management (IDM). This document explains the relationship between IDM and other existing asset management standards. Additionally, this document describes principles and defines organizational and functional structures associated with IDM. This document also introduces the concept of IDM program for coordination of multiple stakeholders.
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In addition to the requirements of IEC 61326-1, this part of IEC 61326 specifies the EMC test requirements for process automation equipment using at least one Ethernet-APL (Ethernet ADVANCED PHYSICAL LAYER) compliant port according IEC TS 63444. The type of equipment covered by this document includes INFRASTRUCTURE DEVICES such as switches as well as measurement and control devices. This document provides requirements for the EMC test setups of the APL interface for devices intended for use in process control and process measurement. The other functions of the equipment remain covered by other parts of the IEC 61326 series. NOTE Ethernet-APL uses IEEE Std. 802.3-2022 Ethernet Physical Layer 10BASE-T1L, suitable to be used for full- duplex communication over a single balanced pair of conductors. The test levels are based on the intended environment as stated in the product’s specification or user documentation and selected appropriately from IEC 61326-1.
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This part of the EN IEC 61360 specifies the new data dictionary (domain) “IEC 61360-7 - General items” including its generic concepts. The IEC 61360-7 data dictionary provides concepts (dictionary elements e.g. classes, properties) intended for cross-domain use.
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IEC 61514-2:2026 specifies design reviews and tests intended to measure and determine the static and dynamic performance, the degree of intelligence and the communication capabilities of single-acting or double-acting intelligent valve positioners. The tests can be applied to positioners which receive standard analogue electrical input signals (as specified in IEC 60381-1 or IEC 60381-2) and/or digital signals via a data communication link (for example Fieldbus) and have a pneumatic output. An intelligent valve positioner as defined in Clause 3 is an instrument that uses for performing its functions digital techniques for data processing, decision-making and bi-directional communication. It can be equipped with additional sensors and additional functionality supporting the main function. The performance testing of an intelligent valve positioner is conducted with the positioner mounted on and connected to the actuator/valve assembly the positioner is used on. The specific characteristic parameters of the actuator/valve combination such as size, stroke, friction, type of packing, spring package and supply pressure for the pneumatic part has significant impact on the performance of a positioner. The methods of evaluation given in this document are intended for testing laboratories to verify equipment performance specifications. The manufacturers of intelligent positioners are urged to apply this document at an early stage of development.
This document is intended to provide guidance for designing evaluations of intelligent valve positioners by providing:
- a checklist for reviewing their hardware and software design in a structured way;
- test methods for measuring and qualifying their performance under various environmental and operational conditions;
- methods for reporting the data obtained.
When a full evaluation, in accordance with this document, is not required or possible, the tests which are required are performed and the results reported in accordance with the relevant clauses of this document. In such cases, the test report will state that it does not cover the full number of tests specified herein. Furthermore, the items omitted are mentioned, to give the reader of the report a clear overview. This document is also applicable for non-intelligent microprocessor-based valve positioners without means for bi-directional communication. In that case an evaluation will be reduced to a limited programme of performance testing and a review of the construction. This third edition cancels and replaces the second edition published in 2013. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) in 5.5.2, the standard for the measurements of influence quantities has been changed to IEC 62828-1:2026;
b) all references to IEC 61514 have been updated to IEC 61514:2026;
c) the aspect of cyber-security has been added in 4.2.7 and 4.2.9.
This document is to be used in conjunction with IEC 61514:2026.
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This document defines terms as used in the ISO 18101 series that apply to the domain of asset-intensive industry interoperability.
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This document specifies digital twin compositions in manufacturing by defining principles, describing methodologies and providing use-case examples of digital twin communication, aggregation and interoperation. This document identifies three kinds of digital twin composition (integrated, unified, and federated) and specifies requirements and step-by-step implementation guidelines for each kind. It provides structured approaches for composing multiple digital twins to support interoperability among digital twins developed by different parties, such as vendors, solution providers, and in-house developers. The document also includes illustrative use cases to demonstrate the practical application of the specified composition approaches.
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IEC/IEEE 60802:2026 defines time-sensitive networking profiles for industrial automation. The profiles select features, options, configurations, defaults, protocols, and procedures of bridges, end stations, and LANs to build industrial automation networks. This document also specifies YANG modules defining read-only information available online and offline as a digital data sheet. This document also specifies YANG modules for remote procedure calls and actions to address requirements arising from industrial automation networks.
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IEC 62541-9:2026 specifies the representation of Alarms and Conditions in the OPC Unified Architecture. Included is the Information Model representation of Alarms and Conditions in the OPC UA address space. Other aspects of alarm systems like alarm philosophy, life cycle, alarm response times, alarm types and many other details are captured in standards such as IEC 62682 and ISA 18.2. The Alarms and Conditions Information Model in this document, is designed in accordance with IEC 62682 and ISA 18.2. Annex C specifies a recommended mapping between OPC Classic Alarm & Events (A&E) servers to the model described in this document. Annex A describes recommended localized names for Alarm states. Annex B describes examples (e.g. Event sequences, Alarm areas in AddressSpace). This fourth edition cancels and replaces the third edition published in 2020. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) addition of "Comment" parameter to Alarm shelving methods; b) addition of method that allows a client to get the members of a group, since it is possible that the AddressSpace does not expose instances of alarms; c) addition of deadband properties for all limits in the limit AlarmType (from which all other types described in this issue are derived); d) addition of text explaining the disabling of alarms is no longer supported in ISA 18.2 and that it is maintained in this document for backward compatibility, but that it is recommended that Alarm not be disabled; e) addition of optional severities for limit alarms; f) addition of new AlarmState variable type that can be used to collect alarm information for displays on graphics; g) addition of SupportsFilterRetain property to improve Client filtering; h) removal of ConditionSubClassId and ConditionSubClassNames from the conditiontype definition since they are now defined in BaseEventType.
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This document describes a solution for integrating advanced process control and optimization capabilities for manufacturing systems by introducing the advanced control system of the distillation column in detail with a separate distillation column as an application case. This document is intended to be used with ISO 15746-1, ISO 15746-2 and ISO 15746-3.
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This document specifies how a digital thread enables the creation, connectivity, management, and maintenance of manufacturing digital twins across the product life cycle, including design, planning, production, and testing by defining principles, presenting methodologies, and providing use case examples.
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IEC 62828-1:2026 establishes a general framework for defining reference conditions and test procedures applicable for assessing the measurement performances of all types of industrial and process measurement transmitters (PMTs) used in measuring and control systems for industrial process and machinery. For the purpose of this document, an analogue PMT is a process measurement transmitter with only analogue current and/or voltage output(s), irrespective the technology adopted and the complexity of the circuitry. All the other process measurement transmitters, with digital output(s) only or with hybrid analogue and digital output(s), are considered to be digital PMTs. This document constitutes a common reference for the other parts of the IEC 62828 series. Specific test procedures and additional requirements for given types of PMTs (pressure, temperature, level, flow, etc.) are covered by other parts of this series. Sensing devices according to the IEC 60947 series are excluded from the scope of this document.
NOTE 1 In industrial and process applications, to indicate the process measurement transmitters, it is common also to use the terms "industrial transmitters", or "process transmitters".
NOTE 2 For better clarity, when the complete definition "industrial and process measurement transmitter" makes the sentence too long in this document, the short term "transmitter", or PMT, is used instead.
This second edition cancels and replaces the first edition published in 2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) informative Annexes E, F, G and H have been removed;
b) a new informative Annex G “Example of signal current for a 4 mA to 20 mA PMT” has been introduced (it has been moved from IEC 62828-2:2017 to this document);
c) the definitions of warm-up time, settling time and output signal have been moved from IEC 62828-4:2020 to this document;
d) The definitions of “inaccuracy” and “accuracy” have been reworked;
e) The clause regarding test report has been reworked.
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IEC 62828-2:2026 establishes specific procedures for testing pressure process measurement transmitters (PMT) used in measuring and control systems for industrial processes and for machinery. A pressure PMT can feature a remote seal to bring the process variable to the sensing element in the PMT. When the remote seal cannot be separated from the PMT, the complete device is tested. For general test procedures, reference is made to IEC 62828-1, which is applicable to all types of process measurement transmitters.
NOTE In industrial and process applications, to indicate the process measurement transmitters, it is common also to use the terms "industrial transmitters", or "process transmitters".
This second edition cancels and replaces the first edition published in 2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) revision according to the latest IEC rules;
b) comparison with the general part of IEC 62828-1;
c) additions and more precise definitions in the “Terms and definitions” clause;
d) correction of the calculation formulas for the measurement error;
e) more precise formulation of long-term drift;
f) extension of additional tests;
g) transfer of the annex “Example of signal current range for a 4 to 20 mA PMT” in IEC 62828-1;
h) new Annex C “Main characteristics for pressure transmitters”.
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This document defines terms related to integration of life-cycle data for process plant installations. These terms are used by the parts in the ISO 15926 series. The following are outside the scope of this document: the reference data items that are contained in the reference data library, such as those covered in ISO/TS 15926-4:2024; the entities used in the data model, such as those covered in ISO 15926-2:2003.
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IEC 61514:2026 specifies tests designed to determine the static and dynamic performance of single-acting or double-acting analogue positioners. The tests apply to positioners which receive standard analogue input signals (as specified in IEC 60381-1, IEC 60381-2 and IEC 60382) and have a pneumatic output. Positioners with pulsed or digital input signals, positioners with digital controllers and positioners with pulsed outputs are outside the scope of this document. Testing is conducted either on a positioner alone, independently of an actuator, or on a positioner mounted and connected to a specific actuator, as a combined unit. The text makes clear where different approaches are required. The methods of evaluation given in this document are intended for use by manufacturers to determine the performance of their products, and by users, or independent testing establishments, to verify manufacturers' performance specifications. The closest liaison between the evaluating body and the manufacturer is indispensable during the tests, including the possibility for the manufacturer to influence the test programme based on the manufacturer's specifications for the instrument and comment on both the test programme and the results. This document is intended to provide definitions of positioner elements, actions, and characteristics, to specify uniform methods of measuring performance errors and effects of influence quantities on those characteristics, and to describe methods of reporting and evaluating the results of the measurement data obtained. The test conditions described in this publication (for example range of ambient temperatures and power supply) relate to conditions which commonly arise in use. Consequently, the values specified are used where no other values are specified by the manufacturer or user. If other values are used, they will be stated. It is recognized that the manufacturer's specifications and instructions for installation and operation apply during all steps. The tests specified in this document are not necessarily sufficient for instruments specifically designed for unusually arduous conditions. Conversely, a reduced series of tests can serve adequately for instruments designed to perform within a more limited range of conditions. When a full evaluation, in accordance with this document, is not required or possible, only the tests which are required are performed and the results reported in accordance with the relevant parts of this document. In such cases, the test report will state that it does not cover the full number of tests specified herein. This second edition cancels and replaces the first edition published in 2000. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) in 6.6.8 and Table 5, the magnetic field has been changed from 100 A/m to of 30 A/m (Mean Root Square);
b) 6.10.4 and Figure 9 have been modified for better understandability;
c) in 7.4, the reference to IEC 61187 has been deleted and replaced with a new Table 4: Document information.
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IEC 61298-2:2026 specifies general methods and procedures for conducting tests and reporting on the functional and performance characteristics of process instrumentation except process measurement transmitters (PMT) which are standardized by IEC 62828 series. The tests are applicable to any such devices characterized by their own specific input and output variables, and by the specific relationship (transfer function) between the inputs and outputs and include analogue and digital devices. For devices that require special tests, this standard can be used, together with any product specific standard specifying special tests. This document covers tests made under reference conditions.
This third edition cancels and replaces the second edition published in 2008. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Process measurement transmitters (PMT) have been removed from the scope of this standard
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IEC 61298-1:2026 specifies general methods and procedures for conducting tests and reporting on the functional and performance characteristics of process instrumentation except process measurement transmitters (PMT) which are standardized by the IEC 62828 series. The tests are applicable to any such devices characterized by their own specific input and output variables, and by the specific relationship (transfer function) between the inputs and outputs and include analogue and digital devices. For devices that require special tests, this document can be used together with any product specific standard specifying special tests. This document covers general principles which apply to the IEC 61298 series.
This third edition cancels and replaces the second edition published in 2008. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Process measurement transmitters (PMT) have been removed from the scope of this standard.
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IEC 61298-3:2026 specifies general methods and procedures for conducting tests and reporting on the functional and performance characteristics of process instrumentation except process measurement transmitters (PMT) which are standardized by IEC 62828 series. The tests are applicable to any such devices characterized by their own specific input and output variables, and by the specific relationship (transfer function) between the inputs and outputs and include analogue and digital devices. For devices that require special tests, this document can be used, together with any product-specific standard specifying special tests. This document covers tests for the effects of influence quantities. This third edition cancels and replaces the second edition published in 2008. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) process measurement transmitters (PMT) have been removed from the scope of this document;
b) contents of subclauses referring to EMC and electrical safety have been deleted, only leaving reference to the IEC standards.
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IEC PAS 63693:2026 provides the common elements for basic time-critical messaging communications between devices in an automation environment and user programs with a means to access the fieldbus communication environment.
The term “time-critical” is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life.
This document defines in an abstract way:
a) The externally visible services provided by the WiTSnet in terms of:
1) an abstract model for defining application resources (objects) capable of being manipulated by users via the use of the FAL services;
2) the primitive actions and events of the services;
3) the parameters associated with each primitive action and event, and the form which they take;
4) the interrelationship between these actions and events, and their valid sequences.
b) The externally visible behavior provided by the WiTSnet in terms of:
1) the abstract syntax defining the data-link layer and application layer protocol data units conveyed between communicating data-link and application entities;
2) the transfer syntax defining encoding rules that are applied to the data-link layer and the application layer protocol data units;
3) the data-link and the application context state machines defining the data-link and the application service behaviors visible between communicating data-link and application entities; and
4) the data-link and the application relationship state machines defining the data-link and the application service behaviors visible between communicating data-link and application entities.
The purpose of this document is to define the services provided to:
c) the WiTSnet fieldbus application layer at the boundary between the application and data-link layers of the Fieldbus Reference Model;
d) systems management at the boundary between the data-link layer and systems management of the Fieldbus Reference Model;
e) the FAL user at the boundary between the user and the application layer of the Fieldbus Reference Model, and
f) systems management at the boundary between the application layer and systems management of the Fieldbus Reference Model.
The purpose of this document is to define the protocol provided to:
g) define the wire-representation of the service primitives defined in clause 7; and
h) define the externally visible behavior associated with their transfer.
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This part of the EN IEC 61360 specifies the new data dictionary (domain) “IEC 61360-7 - General items” including its generic concepts. The IEC 61360-7 data dictionary provides concepts (dictionary elements e.g. classes, properties) intended for cross-domain use.
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This document specifies a reference model and process for Collaborative Modeling and Simulation Environment (CMSE), which establishes a general framework of CMSE to provide guidance for implementation of joint simulation projects. The CMSE which is based on the reference process and the reference model including neutral interfaces and meta-models can enable service-oriented share-use of the infrastructure, integration of the software and collaboration of the business to improve collaboration among all kinds of stakeholders involved in a joint simulation project which needs on-demand simulation at any time and any place upon different manufacturing platforms owned by different enterprises or by different departments within an enterprise. This document can not only be applied to manufacturing enterprises but also be applied to other kinds of enterprises. It is intended for use by stakeholders who are concerned with developing and deploying solutions of the joint simulation project based on information and communication technology. It focuses on simulation activities related cross-platform simulation collaboration capability supporting business planning and logistics, manufacturing operations management and production control within or among enterprises, which can cover the levels from 2 to 4 of the functional hierarchy of manufacturing systems in IEC 62264-3[27]. This document specifies the following: the general framework of CMSE; the methodology of the joint simulation project analysis and realization by CMSE. This document does not relate to the simulation irrelevant collaboration environment, and does not specify the specific approach to implement CMSE in the solution formulation of joint simulation projects.
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This document specifies guidelines to improve data quality by cleansing sensor data anomalies that affect low inherent quality characteristics. The following are within the scope of this document: principles for sensor data cleansing; the process for sensor data cleansing; implementation requirements for sensor data cleansing; list of data anomaly detection and repair methods (see Annex B); examples of sensor data cleansing (see Annex C). The following are outside the scope of this document: algorithms or detailed methods to detect and repair data anomalies; the process of sensor data cleansing for real time processing.
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IEC 61512-1:2026 applies to systems, specifications, and their use for implementing batch and related procedure-oriented manufacturing controls in the process industries. This document establishes a reference model framework for procedure-oriented control, defines terms to help explain the model relationships and usage, and describes general criteria for evaluating conformance. This follows the principle of separation between recipe procedural elements and equipment procedural elements enabling operations to define recipes without the need of changes in equipment procedures.
This second edition cancels and replaces the first edition published in 1997. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Models and text are modified to provide more detail and clarity. Key clarifications are:
1) Two types of equipment modules are defined: generic and recipe-aware. All recipe-aware equipment modules contain procedural control and can be used as phases in the recipe.
2) Execution of all procedural control contained directly in units is part of the Unit Supervision activity.
3) The relationships between types of recipes, recipe components, and equipment control are more fully described and illustrated.
4) Entity relationship diagrams have been replaced with more intuitive UML instance diagrams, except for the equipment entity model.
5) The transition diagram for the procedural states example has been updated with a more intuitive and complete UML state diagram.
6) References to other standards in the series and to IEC 62264 are included to provide direction for further clarification of selected topics.
7) Activity names are capitalised to help prevent confusion with similar terms, such as their underlying functions.
b) Previous Clauses 4 through 6 (now Clauses 4 through 8) were rearranged to provide a clearer top-down organisation of the document. Key changes are:
1) Removing the lower levels of the physical (role-based equipment) model (see 4.4.2) to eliminate redundancy because their groupings are defined by the associated functionality in the equipment entity model and are not meaningful for batch control without those associations.
2) Describing equipment control and the equipment entity model immediately after the physical (role-based equipment) model and describing each level as completely as possible without excessive use of forward references (see 4.4.3).
3) Combining the descriptions of basic, procedural, and coordination control with their usage in each type of equipment entity, providing a single consolidated discussion of each type of control (see Clause 5)
4) Additional considerations to support application of the models have been grouped in Clause 7 to clarify their supporting relationship to the core models.
c) Clause 9 was added to define completeness, compliance, and conformance in relation to this document.
d) Annex B was added to provide a more expansive procedural state reference model. The model found in Clause 7 can be considered a collapsed version of this more general model.
e) Annex C was added to clarify a number of points concerning the models, their application, and the new Clause 9 on conformance and compliance.
f) Annex E was added to more fully describe the changes in this update to IEC 61512-1:1997.
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This document describes a digital twin system for monitoring and managing the robotic multilayer and multipass gas-shielded metal arc welding process.
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IEC 62541-2:2026 describes the OPC Unified Architecture (OPC UA) security model. It describes the security threats of the physical, hardware, and software environments in which OPC 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 the IEC 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 specified normatively in other parts of the 62541 series. It provides suggestions or best practice guidelines on implementing security. Any seeming ambiguity between this document and one of the other normative parts does not remove or reduce the requirement specified in the other normative part.
There are many different aspects of security that are addressed when developing applications. However, since OPC UA specifies a communication protocol, the focus is 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 against tampering. It is important that the developers look into all aspects of security and decide how they can be addressed in the application. Common security features for industrial Controls are defined in IEC 62443-4-2 and OPC UA defined a relationship to them in Annex A.
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 OPC UA. 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 actual implementation of the OPC UA applications and the choices made for the site security.
This edition cancels and replaces the third edition of IEC TR 62541-2, published in 2020.This edition constitutes a technical revision.
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This part of EN 61326 is a product family standard specifying requirements for immunity and emissions regarding electromagnetic compatibility (EMC) for electrical equipment, operating from a supply or battery of less than 1 000 V AC or 1 500 V DC or from the circuit being measured. Equipment intended for professional, industrial-process, industrial-manufacturing and educational use is covered by this part. It includes equipment and computing devices for - measurement and test; - control; - LABORATORY use; - accessories intended for use with the above (such as sample handling equipment), intended to be used in industrial and non-industrial locations.
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IEC 62264-2:2026 specifies interface content exchanged between manufacturing control functions and other enterprise functions as interrelated information models. The information models are represented as an interrelated collection of conceptual object models which can be used for the implementation of applications with logical data and physical data models. The data exchanges in interfaces are scoped as between Level 3 manufacturing operations and Level 4 business systems in the hierarchical model defined in IEC 62264-1. The purpose of this document is to reduce the risk, cost, and errors associated with interface implementation. Since this document covers many manufacturing operations and enterprise domains and there are many different standards for those domains, the semantics of this data exchange standard are described at a conceptual level intended to enable the other standards to be mapped to these semantics. To this end, this document defines a set of elements contained in the generic interface, together with a mechanism for extending the interface content for implementations. The scope is limited to the definition of object models and attributes of the exchanged information defined in the IEC 62264-1. This third edition cancels and replaces the second edition published in 2013. It is published as a double logo standard. This edition constitutes a technical revision. Due to the extent of the changes and updates, this document cannot ensure backward compatibility to implementations based on older editions. This edition includes the following significant technical changes with respect to the previous edition and ANSI/ISA 95.00.02-2018 (ED3): a) object models are added for the use of interactive communications to notify subscribers about the occurrence of events and to provide context information about the event, making the information exchange more efficient and consistent. The added object models were the operations event model and operations record model. b) operations location model and spatial definition attribute added to allow the description of operation locations. c) operations test model added to define how test specifications and test results are related to testable objects, operations test requirements, actual resource, and work definitions. d) definition of possible measurement uncertainty sub-attributes for all value, quantity and duration attributes defined in this document. e) updated hierarchy scope model. f) removed as separate models in this edition were the models for product definition, production schedule, production performance, and production capability. Their content is covered for all manufacturing operations management categories under operations models. g) object model was added for the operations segment capability as a collection of resources related to other operations models. h) updated relationship name and role name conventions established in 3.3.4 and implemented across all models and associated tables. i) updated all objects’ relationship role table with explicit source and target names. j) updated common header attributes for objects and property objects established in 4.5 and implemented across all models and associated tables. k) updated explanation of the ‘relationships between resource reference objects in operations management information models and resource models. These additional resource relationships are added to all operations management models. l) added an annex explanation for implementation options for specifying values in unit of measurement a
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IEC 62541-9:2026 specifies the representation of Alarms and Conditions in the OPC Unified Architecture. Included is the Information Model representation of Alarms and Conditions in the OPC UA address space. Other aspects of alarm systems like alarm philosophy, life cycle, alarm response times, alarm types and many other details are captured in standards such as IEC 62682 and ISA 18.2. The Alarms and Conditions Information Model in this document, is designed in accordance with IEC 62682 and ISA 18.2. Annex C specifies a recommended mapping between OPC Classic Alarm & Events (A&E) servers to the model described in this document. Annex A describes recommended localized names for Alarm states. Annex B describes examples (e.g. Event sequences, Alarm areas in AddressSpace). This fourth edition cancels and replaces the third edition published in 2020. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) addition of "Comment" parameter to Alarm shelving methods;
b) addition of method that allows a client to get the members of a group, since it is possible that the AddressSpace does not expose instances of alarms;
c) addition of deadband properties for all limits in the limit AlarmType (from which all other types described in this issue are derived);
d) addition of text explaining the disabling of alarms is no longer supported in ISA 18.2 and that it is maintained in this document for backward compatibility, but that it is recommended that Alarm not be disabled;
e) addition of optional severities for limit alarms;
f) addition of new AlarmState variable type that can be used to collect alarm information for displays on graphics;
g) addition of SupportsFilterRetain property to improve Client filtering;
h) removal of ConditionSubClassId and ConditionSubClassNames from the conditiontype definition since they are now defined in BaseEventType.
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This part of IEC 62541 is part of the overall OPC Unified Architecture specification series and defines the information model associated with Aggregates.
Programmatically produced aggregate examples are listed in Annex A.
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This part of IEC 62541, the IEC standards series dedicated to the OPC Unified Architecture, defines an Information Model. The Information Model describes the basic infrastructure to model file transfers.
NOTE In the previous version, File Transfer was in IEC 62541-5:2020, Annex C.
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IEC 62541-19: 2025 defines an Information Model of the OPC Unified Architecture. The Information Model describes the basic infrastructure to reference from an OPC UA Information Model to external dictionaries like IEC Common Data Dictionary or ECLASS.
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IEC 62541-1:2025 presents the concepts and overview of the OPC Unified Architecture (OPC UA). Reading this document is helpful to understand the remaining parts of the IEC 62541 series. Each of the other parts is briefly explained along with a suggested reading order. This first edition cancels and replaces IEC TR 62541-1 published in 2020
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IEC 62541-24:2026 specifies an OPC UA information model to expose information, at what dates and times specific actions are executed by the OPC UA Server. Those schedules can optionally also be manipulated via the information model.
The schedule defines on which dates they are active, and can also reference global calendars representing specific dates, for example public holidays. In addition, the schedule defines times and actions that will be executed at that time. The model defines writing Variables and calling Methods but can be extended to other actions as well.
The NamespaceUri for all NodeIds defined in this document is defined in Annex A.
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IEC 62541-21:2026 defines the life cycle of Devices and Composites and mechanisms to verify their authenticity, set up their security and maintain their configuration.
The NodeIds of all Nodes described in this standard are only symbolic names. Annex A defines the NamespaceUri for all NodeIds and the actual NodeIds.
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IEC 62541-5:2026 This edition includes the following significant technical changes with respect to the previous edition:
a) Annex B has been removed and used to create IEC 62451-16;
b) Annex C has been removed and used to create IEC 62451-20;
c) currency information model has been added;
d) information model for Interfaces and AddIns has been added;
e) information model for Method Metadata has been added;
f) MaxSessions, MaxSubscriptions, and MaxMonitoredItems have been added to capabilities;
g) information model for ordered list of objects has been added;
h) PortableQualifiedName and PortableNodeId DataTypes have been added;
i) UriString DataType has been added;
j) SemanticVersionString DataType has been added;
k) AssociatedWith Reference Type has been added;
l) ConfigurationVersion Property has been added to NamespaceMetadataType;
m) AuditClientEventType and AuditClientUpdateMethodResultEventType have been added;
n) ModelVersion has been added to NamespaceMetadataType;
o) NoTransparentBackupRedundancyType has been added to support a Primary/Standby use case;
p) BitFieldType and BitFieldDefinitionType have been added.
This fourth edition cancels and replaces the third edition published in 2020. This edition constitutes a technical revision.
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IEC 62541-16:2025 defines an Information Model. The Information Model describes the basic infrastructure to model state machines.
NOTE State Machines were dealt with in IEC 62541‑5:2020, Annex B. In newer versions of IEC 62541‑5 this Annex B was removed and replaced by this document
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IEC 62541-7: 2025 specifies value and structure of Profiles in the OPC Unified Architecture.
OPC UA Profiles are used to segregate features with regard to testing of OPC UA products and the nature of the testing. The scope of this document includes defining functionality that can only be tested. The definition of actual TestCases is not within the scope of this document, but the general categories of TestCases are covered by this document.
Most OPC UA applications will conform to several, but not all of the Profiles.
This fourth edition cancels and replaces the third edition published in 2020. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Profiles and ConformanceUnits are not part of this document, but are solely managed in a public database as described in Clause 1.
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IEC 62541-100:2025 defines the information model associated with Devices. This document describes three models which build upon each other as follows:
• The (base) Device Model is intended to provide a unified view of devices and their hardware and software parts irrespective of the underlying device protocols.
• The Device Communication Model adds Network and Connection information elements so that communication topologies can be created.
• The Device Integration Host Model finally adds additional elements and rules required for host systems to manage integration for a complete system. It enables reflecting the topology of the automation system with the devices as well as the connecting communication networks.
This document also defines AddIns that can be used for the models in this document but also for models in other information models. They are:
• Locking model – a generic AddIn to control concurrent access,
• Software update model – an AddIn to manage software in a Device.
This second edition cancels and replaces the first edition published in 2015. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a a ComponentType that can be used to model any HW or SW element of a device has been defined and a SoftwareType has been added as subtype of ComponentType;
b the new OPC UA interface concept and defined interfaces for Nameplate, DeviceHealth, and SupportInfo has been added.
c) a new model for Software Update (Firmware Update) has been added;
d) a new entry point for documents where each document is represented by a FileType instance has been specified;
e) a model that provides information about the lifetime, related limits and semantic of the lifetime of things like tools, material or machines has been added.
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This part of IEC 62541 defines the Information Model associated with Programs in OPC Unified Architecture (OPC UA). This includes the description of the NodeClasses, standard Properties, Methods and Events and associated behaviour and information for Programs.
The complete AddressSpace model including all NodeClasses and Attributes is specified in IEC 62541-3. The Services such as those used to invoke the Methods used to manage
Programs are specified in IEC 62541-4.
An example for a DomainDownload Program is defined in Annex A.
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This part of IEC 62541 is part of the overall OPC Unified Architecture (OPC UA) standard series and defines the information model associated with Data Access (DA). It particularly includes additional VariableTypes and complementary descriptions of the NodeClasses and Attributes needed for Data Access, additional Properties, and other information and behaviour.
The complete address space model, including all NodeClasses and Attributes is specified in IEC 62541-3. The services to detect and access data are specified in IEC 62541-4.
Annex A specifies how the information received from OPC COM Data Access (DA) Servers is mapped to the Data Access model.
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This part of IEC 62541 defines the OPC Unified Architecture (OPC UA) Services. The Services defined are the collection of abstract Remote Procedure Calls (RPC) that are implemented by OPC UA Servers and called by OPC UA Clients. All interactions between OPC UA Clients and Servers occur via these Services. The defined Services are considered abstract because no particular RPC mechanism for implementation is defined in this document. IEC 62541-6 specifies one or more concrete mappings supported for implementation. For example, one mapping in IEC 62541-6 is to UA-TCP UA-SC UA-Binary. In that case the Services described in this document appear as OPC UA Binary encoded payload, secured with OPC UA Secure Conversation and transported via OPC UA TCP.
Not all OPC UA Servers implement all of the defined Services. IEC 62541-7 defines the Profiles that dictate which Services must be implemented in order to be compliant with a particular Profile.
A BNF (Backus-Naur form) for browse path names is described in Annex A.
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This part of IEC 62541 belongs to the OPC Unified Architecture standards series and defines the Information Model associated with Historical Access (HA). It particularly includes additional and complementary descriptions of the NodeClasses and Attributes needed for Historical Access, additional standard Properties, and other information and behaviour.
The complete AddressSpace Model including all NodeClasses and Attributes is specified in IEC 62541-3. The predefined Information Model is defined in IEC 62541-5. The Services to detect and access historical data and events, and description of the ExtensibleParameter types are specified in IEC 62541-4.
This document includes functionality to compute and return Aggregates like minimum, maximum, average etc. The Information Model and the concrete working of Aggregates are defined in IEC 62541-13.
Conventions for Historical Access Clients are informatively provided in Annex A.
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IEC 62541-14:2026 defines the PubSub communication model. It defines an OPC UA publish subscribe pattern which complements the client server pattern defined by the Services in IEC 62541-4. See IEC 62541-1 for an overview of the two models and their distinct uses.
PubSub allows the distribution of data and events from an OPC UA information source to interested observers inside a device network as well as in IT and analytics cloud systems.
This document consists of
• a general introduction of the PubSub concepts,
• a definition of the PubSub configuration parameters,
• mapping of PubSub concepts and configuration parameters to messages and transport protocols,
• and a PubSub configuration model.
This second edition cancels and replaces the first edition published in 2020. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Addition of a “Quantity Model” which can be referenced from EngineeringUnit Properties. The model defines quantities and assigned units. In addition it provides alternative units and the conversion to them.
b) Addion of rules for ValuePrecision Property:
• can also be used for other subtypes like Duration and Decimal.
• rules have been added when ValuePrecision has negative values.
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IEC 62541-3: 2025 describes the OPC Unified Architecture (OPC UA) AddressSpace and its Objects. This specification is the OPC UA meta model on which OPC UA information models are based. This fourth edition cancels and replaces the third edition published in 2020. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) addition of the concept and modelling elements for Interfaces and AddIns;
b) addition of Currency;
c) addition of Method Meta Data to define additional attributes for Method Arguments;
d) addition of ApplyRestrictionToBrowse bit to AccessRestrictionType;
e) addition of a Non-Volatile Storage bit to AccessLevelExType;
f) addition of a Constant bit and ConfigurationConstant bit to AccessLevelExType;
g) the View NodeClass has been changed to define the EventNotifier as an EventNotifierType in the same way the Object NodeClass defines it;
h) correctition of HasNotifier, HasEventSource, and Organizes, to include ObjectType as valid source node;
i) NamingRules have become deprecated;
j) addition of AssociatedWith ReferenceType.
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