IEC 62453-71:2023

IEC 62453-71 ®
Edition 1.0 2023-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Field device tool (FDT) interface specification –
Part 71: OPC UA Information Model for FDT

Spécification des interfaces des outils des dispositifs de terrain (FDT) –
Partie 71: Modèle d’information de l’OPC UA pour outils FDT
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IEC 62453-71 ®
Edition 1.0 2023-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Field device tool (FDT) interface specification –

Part 71: OPC UA Information Model for FDT

Spécification des interfaces des outils des dispositifs de terrain (FDT) –

Partie 71: Modèle d’information de l’OPC UA pour outils FDT

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS  25.040 ISBN 978-2-8322-7619-8

– 2 – IEC 62453-71:2023 © IEC 2023
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
0.1 General . 9
0.2 Presentation of FDT . 9
0.3 Presentation of OPC Unified Architecture. 9
0.4 Presentation of OPC UA Device Integration . 10
1 Scope . 12
2 Normative references . 12
3 Terms, definitions and abbreviated terms . 12
3.1 Terms and definitions . 12
3.2 Abbreviated terms . 13
4 Conventions used in this document . 13
4.1.1 Document conventions . 13
4.1.2 Conventions for FDT methods . 13
4.1.3 Conventions for Node descriptions . 13
4.1.4 NodeIds and BrowseNames . 16
4.1.5 Common Attributes . 17
4.1.6 Graphical notation . 19
5 Concept . 20
5.1 System architecture . 20
6 FDT specific OPC UA ObjectTypes . 21
6.1 General . 21
6.2 FdtDeviceType . 21
6.3 FdtFunctionalGroupType . 23
6.4 IFdtDeviceHealthType interface . 23
6.5 IFdtSupportInfoType interface . 23
6.5.1 Overview . 23
6.6 Document types . 24
6.6.1 FdtDocumentType . 24
6.6.2 FdtDocumentFile . 24
6.6.3 FdtDocumentUrl. 25
6.7 FdtProtocolType . 25
6.8 FdtTransferServiceType . 26
6.9 FdtIoSignalInfoType . 26
7 OPC UA EventTypes . 27
7.1 Overview. 27
7.2 FdtAuditEventType . 28
7.3 FdtStartMethodEventType. 28
7.4 FdtEndMethodEventType . 28
7.5 FdtAuditWriteUpdateEventType . 29
8 OPC UA VariableTypes . 29
8.1 FdtParameter . 29
9 OPC UA DataTypes . 31
9.1 DataRefType . 31
9.2 FdtDeviceClassificationType . 31
9.3 SemanticInfoType . 32

9.4 Enumeration datatypes . 32
9.4.1 AlarmType . 32
9.4.2 ApplicationIdEnumeration . 33
9.4.3 ClassificationDomainId . 33
9.4.4 ClassificationId . 34
9.4.5 DocumentClassification . 36
9.4.6 FunctionExecutionResultState . 36
9.4.7 IECDatatype . 37
9.4.8 RangeType . 38
9.4.9 SignalTypeEnumeration . 38
9.4.10 SubstitutionType . 38
9.4.11 SupportedTransfer . 39
10 OPC UA ReferenceTypes – HasIOSignalRef . 39
11 Mapping of DataTypes . 40
11.1 Primitive data types – DeviceHealthEnumeration . 40
11.2 Mapping to OPC DI types . 40
11.2.1 Device type . 40
11.2.2 TopologyElementType . 45
11.2.3 FunctionalGroupType . 46
11.2.4 Identification FunctionalGroup . 47
11.2.5 Device data and device methods . 48
11.2.6 Methods . 49
11.2.7 Variable . 52
11.2.8 Device support information . 54
11.2.9 FdtProtocolType . 56
12 Profiles and Conformance Units . 56
12.1 Conformance Units . 56
12.2 Profiles . 57
12.2.1 Profile list . 57
12.2.2 Server Facets . 57
12.2.3 Client Facets . 58
13 Namespaces . 59
13.1 Namespace metadata . 59
13.2 Handling of OPC UA namespaces . 60
Annex A (normative)  FDT namespace and identifiers . 61
Annex B (informative) Use cases . 62
B.1 General . 62
B.2 Use case: List topology . 62
B.3 Use case: Identify device . 63
B.4 Get list of available device parameters . 64
B.4.1 Use case: Browse device parameters . 64
B.4.2 Use case: Get attributes of a device parameter . 65
B.5 Use case: Get Device Status . 66
B.6 Use case: Get Device Diagnostics . 67
B.7 Read parameters . 68
B.7.1 Use case: Read offline data . 68
B.7.2 Use case: Read online data . 69
B.8 Use case: Write device parameters . 70

– 4 – IEC 62453-71:2023 © IEC 2023
B.9 Use case: Audit trail . 71
Bibliography . 72

Figure 1 – OPC UA Devices Example . 11
Figure 2 – The OPC UA Information Model Notation . 19
Figure 3 – System architecture according to IEC 62453-42 . 21
Figure 4 – FdtDeviceType overview . 22
Figure 5 – FdtProtocolType overview . 25
Figure 6 – FdtTransferServiceType overview . 26
Figure 7 – FdtIoSignalInfoType overview . 27
Figure 8 – Audit event type overview . 28
Figure 9 – Example for sources of DeviceType information . 41
Figure 10 – Example for sources of TopologyType information . 45
Figure 11 – Example for mapping of data and function information . 49
Figure 12 – Example for source of function information . 50
Figure 13 – Example for source of static function information . 51

Table 1 – Examples of DataTypes . 14
Table 2 – Example for type definition . 15
Table 3 – Examples of other characteristics . 15
Table 4 – Type Additional References . 15
Table 5 – Type Additional sub-components . 16
Table 6 – Type Attribute values for child Nodes . 16
Table 7 – Common Node Attributes . 17
Table 8 – Common Object Attributes . 18
Table 9 – Common Variable Attributes . 18
Table 10 – Common VariableType Attributes . 18
Table 11 – Common Method Attributes . 19
Table 12 – FdtDeviceType definition . 22
Table 13 – FdtFunctionalGroupType definition . 23
Table 14 – IFdtDeviceHealthType definition . 23
Table 15 – IFdtSupportInfoType definition . 24
Table 16 – IFdtSupportInfoType additional subcomponents . 24
Table 17 – FdtDocumentType definition . 24
Table 18 – FdtDocumentFile definition . 25
Table 19 – FdtDocumentUrl definition . 25
Table 20 – FdtProtocolType definition . 26
Table 21 – FdtTransferServiceType definition . 26
Table 22 – FdtIoSignalInfoType definition . 27
Table 23 – FdtAuditEventType definition . 28
Table 24 – FdtStartMethodEventType definition . 28
Table 25 – FdtEndMethodEventType definition . 29
Table 26 – FdtAuditWriteUpdateEventType definition . 29

Table 27 – FdtParameter definition . 30
Table 28 – DataRefType structure . 31
Table 29 – DataRefType definition . 31
Table 30 – FdtDeviceClassificationType structure . 31
Table 31 – FdtDeviceClassificationType definition . 32
Table 32 – SemanticInfoType structure . 32
Table 33 – SemanticInfoType definition . 32
Table 34 – AlarmType items . 32
Table 35 – AlarmType definition . 33
Table 36 – ApplicationIdEnumeration items . 33
Table 37 – ApplicationIdEnumeration definition . 33
Table 38 – ClassificationDomainId items . 34
Table 39 – ClassificationDomainId definition . 34
Table 40 – ClassificationId items . 34
Table 41 – ClassificationId definition . 36
Table 42 – DocumentClassification items . 36
Table 43 – DocumentClassification definition . 36
Table 44 – FunctionExecutionResultState items. 36
Table 45 – FunctionExecutionResultState definition . 37
Table 46 – IECDatatype items . 37
Table 47 – IECDatatype definition . 37
Table 48 – RangeType items . 38
Table 49 – RangeType definition. 38
Table 50 – SignalTypeEnumeration items . 38
Table 51 – SignalTypeEnumeration definition . 38
Table 52 – SubstitutionType items . 39
Table 53 – SubstitutionType definition . 39
Table 54 – SupportedTransfer items . 39
Table 55 – SupportedTransfer definition . 39
Table 56 – HasIOSignalRef definition . 40
Table 57 – Mapping for DeviceHealthEnumeration . 40
Table 58 – DeviceType mapping . 42
Table 59 – Device information mapping . 43
Table 60 – Offline device parameter mapping . 44
Table 61 – Online device parameter mapping . 44
Table 62 – TopologyElementType mapping . 46
Table 63 – FunctionalGroupType mapping . 47
Table 64 – Mapping for FunctionalGroup Identification . 47
Table 65 – Method node information mapping . 50
Table 66 – Method node information mapping for static function . 51
Table 67 – TransferService mapping . 52
Table 68 – Mapping of FDT data items. 52
Table 69 – FdtParameter mapping . 53

– 6 – IEC 62453-71:2023 © IEC 2023
Table 70 – Mapping of simple data types . 54
Table 71 – Device Type Image mapping . 55
Table 72 – ProtocolSupport mapping . 55
Table 73 – FdtIoSignalInfoType node information mapping . 56
Table 74 – FdtProtocolType node information mapping . 56
Table 75 – Conformance Units for FDT . 57
Table 76 – Profile URIs for FDT . 57
Table 77 – FDT Base Server Profile . 58
Table 78 – FDT General Server Facet . 58
Table 79 – FDT General Client Facet . 59
Table 80 – NamespaceMetadata Object for this document . 59
Table 81 – Namespaces used in a FDT Server . 60
Table 82 – Namespaces used in this document . 60

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIELD DEVICE TOOL (FDT) INTERFACE SPECIFICATION –

Part 71: OPC UA Information Model for FDT

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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IEC 62453-71 has been prepared by subcommittee 65E: Devices and integration in enterprise
systems, of IEC technical committee 65: Industrial-process measurement, control and
automation. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
65E/806/CDV 65E/897A/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

– 8 – IEC 62453-71:2023 © IEC 2023
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 62453 series, published under the general title Field device tool
(FDT) interface specification, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

INTRODUCTION
0.1 General
The new OPC Unified Architecture (OPC UA) unifies the existing standards and brings them to
state-of-the-art technology using service-oriented architecture (SOA). Platform-independent
technology allows the deployment of OPC UA beyond current OPC applications only running
on Windows-based PC systems. OPC UA can also run on embedded systems as well as Linux
/ UNIX based enterprise systems. The provided information can be generically modelled and
therefore arbitrary information models can be provided using OPC UA.
FDT standardizes the communication and configuration interface between all field devices and
host systems. FDT provides a common environment for accessing the devices’ most
sophisticated features. Any device can be configured, operated, and maintained through the
standardized user interface – regardless of supplier, type or communication protocol.
This document specifies a synergy of both approaches, thus allowing easy, standardized access
via OPC UA interfaces to device know-how provided on base of FDT.
0.2 Presentation of FDT
FDT is a technology supporting the data exchange between field devices and automation
systems. The technology is based on an interface specification standardized as IEC 62453. The
specification defines two main concepts: Device Type Manager (DTM) and Frame Application.
A DTM is a software component specific to a field device type. A Frame Application is a software
environment (part of the automation system) for integration of DTMs. Within a Frame Application
every DTM provides data and services specific to the respective field device. Since the
technology is based on a standardized set of interfaces, every DTM may be integrated in every
Frame Application. Based on FDT it is possible to integrate communication devices,
communication infrastructure devices (e.g. gateways) and field devices, depending on their
communication protocols. Support for different communication protocols is provided by means
of supplemental communication protocol specifications (e.g. for PROFINET, PROFIBUS,
Ethernet IP, TCP, HART and FF) or by means of manufacturer-specific protocol integration.
0.3 Presentation of OPC Unified Architecture
The main use case for OPC standards is the online data exchange between devices and HMI
or SCADA systems using Data Access functionality. In this use case the device data is provided
by an OPC server and is consumed by an OPC client integrated into the HMI or SCADA system.
OPC DA provides functionality to browse through a hierarchical namespace containing data
items and to read, to write and to monitor these items for data changes. The OPC Classic
specifications are based on Microsoft COM/DCOM technology for the communication between
software components from different vendors. Therefore OPC Classic server and clients are
restricted to Windows OS based automation systems.
OPC UA incorporates all features of OPC Class specifications like OPC DA, A&E and HDA, but
defines platform independent communication mechanisms and generic, extensible and object-
oriented modelling capabilities for the information a system wants to expose.
The OPC UA network communication part defines different mechanisms optimized for different
use cases. The first version of OPC UA is defining an optimized binary TCP protocol for high
performance intranet communication as well as a mapping to accepted internet standards like
Web Services. The abstract communication model does not depend on a specific protocol
mapping and allows the addition of new protocols in the future. Features like security, access
control and reliability are directly built into the transport mechanisms. Based on the platform
independence of the protocols, OPC UA servers and clients can be directly integrated into
devices and controllers.
– 10 – IEC 62453-71:2023 © IEC 2023
The OPC UA Information Model provides a standard way for Servers to expose Objects to
Clients. Objects in OPC UA terms are composed of other Objects, Variables and Methods. OPC
UA also allows relationships to other Objects to be expressed.
The set of Objects and related information that an OPC UA Server makes available to Clients
is referred to as its AddressSpace. The elements of the OPC UA Object Model are represented
in the AddressSpace as a set of Nodes described by Attributes and interconnected by
References. OPC UA defines eight classes of Nodes to represent AddressSpace components.
The classes are Object, Variable, Method, ObjectType, DataType, ReferenceType and View.
Each NodeClass has a defined set of Attributes.
This specification makes use of two essential OPC UA NodeClasses: Objects and Variables.
Objects are used to represent components of a system. An Object is associated with a
corresponding ObjectType that provides definitions for that Object.
Variables are used to represent values. Two categories of Variables are defined, Properties
and DataVariables.
Properties are Server-defined characteristics of Objects, DataVariables and other Nodes.
Properties are not allowed to have Properties defined for them. An example for Properties of
Objects is the Revision Property of a DeviceType.
DataVariables represent the contents of an Object. DataVariables might have component
DataVariables. This is typically used by Servers to expose individual elements of arrays and
structures. This specification uses DataVariables to represent data like the process variables
provided by a device.
0.4 Presentation of OPC UA Device Integration
The specification "OPC UA Device Integration" is an extension of the overall OPC Unified
Architecture specification series and defines the information model associated with Devices.
The model is intended to provide a unified view of Devices irrespective of the underlying Device
protocols. FDT deals with physical or logical Devices and the information model of
IEC 62541-100 therefore is used as base for the FDT information model.
The Devices information model specifies different ObjectTypes and procedures used to
represent devices and related components like the communication infrastructure in an OPC UA
Address Space. The main use cases are device configuration and diagnostic, but it allows a
general and standardized way for any kind of application to access device related information.
The following examples illustrate the concepts used in this specification. See UA Devices for
the complete definition of the Devices information model.
Figure 1 shows an example for a temperature controller represented as Device Object. The
component ParameterSet contains all Variables describing the Device. The component
MethodSet contains all Methods provided by the Device. Both components are inherited from
the TopologyElementType which is the root Object type of the Device Object type hierarchy.
Objects of the type FunctionalGroupType are used to group the Parameters and Methods of the
Device into logical groups. The FunctionalGroupType and the grouping concept are defined in
UA Devices but the groups are device type specific i.e. the groups ProcessData and
Configuration are defined by the TemperatureControllerType in this example.

Figure 1 – OPC UA Devices Example
The use cases in Annex B illustrate the usage of the information model. Not all necessary
Objects need to be realized within a concrete OPC UA Server.

– 12 – IEC 62453-71:2023 © IEC 2023
FIELD DEVICE TOOL (FDT) INTERFACE SPECIFICATION –

Part 71: OPC UA Information Model for FDT

1 Scope
This part of IEC 62453 specifies an OPC UA Information Model to represent the device
information based on FDT-defined device integration.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 62453-1:2023, Field Device Tool (FDT) interface specification – Part 1: Overview and
guidance
IEC 62453-2:2022, Field Device Tool (FDT) interface specification – Part 2: Concepts and
detailed description
IEC 62541-3:2020, OPC Unified Architecture – Part 3: Address Space Model
IEC 62541-5:2020, OPC Unified Architecture – Part 5: Information Model
IEC 62541-6, OPC Unified Architecture – Part 6: Mappings
IEC 62541-7, OPC Unified Architecture – Part 7: Profiles
IEC 62541-8, OPC Unified Architecture – Part 8: Data Access
IEC 62541-100:2015, OPC Unified Architecture – Part 100: Device Interface
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62453-1, IEC 62453‑2
and IEC 62451-100 apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp

3.2 Abbreviated terms
For the purposes of this document, the abbreviations given in IEC 62453-1, IEC 62453-2 as
well as the following apply.
A&E Alarms & Events
DA Data Access
DTM Device Type Manager
FDT Field Device
...