EN IEC 62541-14:2020

SLOVENSKI STANDARD
01-december-2020
Enotna arhitektura OPC - 14. del: Objava
OPC Unified Architecture - Part 14: PubSub
OPC Unified Architecture - Teil 14: Festlegungen zur Umsetzung des Publisher-
Subscriber-Models
Architecture unifiée OPC - Partie 14: PubSub
Ta slovenski standard je istoveten z: EN IEC 62541-14:2020
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.240.50 Uporabniške rešitve IT v IT applications in industry
industriji
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62541-14

NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS 25.040.40; 35.100.05
English Version
OPC unified architecture - Part 14: PubSub
(IEC 62541-14:2020)
Architecture unifiée OPC - Partie 14: PubSub OPC Unified Architecture - Teil 14: Festlegungen zur
(IEC 62541-14:2020) Umsetzung des Publisher-Subscriber-Models
(IEC 62541-14:2020)
This European Standard was approved by CENELEC on 2020-08-12. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62541-14:2020 E

European foreword
The text of document 65E/720/FDIS, future edition 1 of IEC 62541-14, prepared by SC 65E "Devices
and integration in enterprise systems" of IEC/TC 65 "Industrial-process measurement, control and
automation" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-05-12
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-08-12
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 62541-14:2020 was approved by CENELEC as a European
Standard without any modification.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC/TR 62541-1 - OPC unified architecture - Part 1: CLC/TR 62541-1 -
Overview and concepts
IEC/TR 62541-2 - OPC unified architecture - Part 2: CLC/TR 62541-2 -
Security model
IEC 62541-3 - OPC Unified Architecture - Part 3: - -
Address Space Model
IEC 62541-4 - OPC Unified Architecture - Part 4: - -
Services
IEC 62541-5 - OPC Unified Architecture - Part 5: - -
Information Model
IEC 62541-6 - OPC Unified Architecture - Part 6: - -
Mappings
IEC 62541-7 - OPC unified architecture - Part 7: EN IEC 62541-7 -
Profiles
IEC 62541-8 - OPC Unified Architecture - Part 8: EN IEC 62541-8 -
Data Access
IEC 62541-12 - OPC unified architecture - Part 12: EN IEC 62541-12 -
Discovery and global services
ISO/IEC 19464 2014 Information technology - Advanced - -
Message Queuing Protocol (AMQP)
v1.0 specification
ISO/IEC 20922 2016 Information technology - Message - -
Queuing Telemetry Transport (MQTT)
v3.1.1
IETF RFC 7159 - The JavaScript Object Notation - -
(JSON) Data Interchange Format

IEC 62541-14 ®
Edition 1.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
OPC unified architecture –
Part 14: PubSub
Architecture unifiée OPC –
Partie 14: PubSub
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.05 ISBN 978-2-8322-8577-0

– 2 – IEC 62541-14:2020 © IEC 2020
CONTENTS
FOREWORD . 10
1 Scope . 12
2 Normative references . 12
3 Terms, definitions and abbreviated terms . 13
3.1 Terms and definitions . 13
3.2 Abbreviated terms . 14
4 Overview . 14
4.1 Fields of application . 14
4.2 Abstraction layers . 15
4.3 Decoupling by use of middleware . 15
4.4 Synergy of models . 16
5 PubSub Concepts . 16
5.1 General . 16
5.2 DataSet . 17
5.2.1 General . 17
5.2.2 DataSetClass . 18
5.2.3 DataSetMetaData . 18
5.3 Messages . 19
5.3.1 General . 19
5.3.2 DataSetMessage field . 20
5.3.3 DataSetMessage . 20
5.3.4 NetworkMessage . 21
5.3.5 Message security . 21
5.3.6 Transport security . 22
5.3.7 SecurityGroup . 22
5.4 Entities . 22
5.4.1 Publisher . 22
5.4.2 Subscriber . 25
5.4.3 Security Key Service . 26
5.4.4 Message Oriented Middleware . 29
6 PubSub communication parameters . 33
6.1 Overview. 33
6.2 Common Configuration Parameters. 34
6.2.1 PubSubState State Machine . 34
6.2.2 PublishedDataSet parameters . 36
6.2.3 DataSetWriter Parameters . 44
6.2.4 Shared PubSubGroup Parameters . 48
6.2.5 WriterGroup parameters . 50
6.2.6 PubSubConnection Parameters . 52
6.2.7 ReaderGroup parameters . 55
6.2.8 DataSetReader Parameters . 56
6.2.9 SubscribedDataSet Parameters . 60
6.2.10 Information flow and status handling . 63
6.2.11 PubSubConfigurationDataType . 65
6.3 Message mapping configuration parameters . 66
6.3.1 UADP message mapping . 66

IEC 62541-14:2020 © IEC 2020 – 3 –
6.3.2 JSON message mapping . 74
6.4 Transport Protocol mapping configuration parameters . 77
6.4.1 Datagram Transport Protocol . 77
6.4.2 Broker Transport Protocol . 78
7 PubSub mappings . 83
7.1 General . 83
7.2 Message mappings . 83
7.2.1 General . 83
7.2.2 UADP message mapping . 83
7.2.3 JSON message mapping . 99
7.3 Transport Protocol Mappings . 102
7.3.1 General . 102
7.3.2 OPC UA UDP . 102
7.3.3 OPC UA Ethernet . 103
7.3.4 AMQP . 104
7.3.5 MQTT . 109
8 PubSub security key service model . 111
8.1 Overview. 111
8.2 PublishSubscribe Object . 111
8.3 PubSubKeyServiceType . 112
8.4 GetSecurityKeys method . 112
8.5 GetSecurityGroup method . 114
8.6 SecurityGroupType . 115
8.7 SecurityGroupFolderType . 116
8.8 AddSecurityGroup Method . 116
8.9 RemoveSecurityGroup Method . 117
9 PubSub configuration model . 117
9.1 Common configuration model . 117
9.1.1 General . 117
9.1.2 Configuration behaviours . 120
9.1.3 Types for the PublishSubscribe Object . 120
9.1.4 Published DataSet Model. 125
9.1.5 Connection Model . 141
9.1.6 Group Model . 145
9.1.7 DataSetWriter Model . 153
9.1.8 DataSetReader Model . 155
9.1.9 Subscribed DataSet Model . 160
9.1.10 PubSub Status Object. 163
9.1.11 PubSub Diagnostics Objects . 164
9.1.12 PubSub Status Events . 173
9.2 Message Mapping Configuration Model . 175
9.2.1 UADP Message Mapping . 175
9.2.2 JSON Message Mapping . 177
9.3 Transport Protocol Mapping Configuration Model . 178
9.3.1 Datagram Transport Protocol Mapping . 178
9.3.2 Broker Transport Protocol Mapping. 179
Annex A (normative) Common types . 182
A.1 DataType Schema Header structures . 182

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A.1.1 DataTypeSchemaHeader . 182
A.1.2 DataTypeDescription . 183
A.1.3 StructureDescription . 183
A.1.4 EnumDescription . 184
A.1.5 SimpleTypeDescription . 184
A.2 UABinaryFileDataType . 184
A.3 NetworkAddress Model . 185
A.3.1 NetworkAddressType . 185
A.3.2 NetworkAddressUrlType . 186
Annex B (informative) Client Server vs. Publish Subscribe . 187
B.1 Overview. 187
B.2 Client Server Subscriptions . 187
B.3 Publish-Subscribe . 188
B.4 Synergy of models . 189

Figure 1 – Publish Subscribe Model overview . 15
Figure 2 – Publisher and Subscriber entities . 17
Figure 3 – DataSet in the process of publishing . 18
Figure 4 – OPC UA PubSub message layers . 20
Figure 5 – Publisher details . 23
Figure 6 – Publisher message sending sequence . 24
Figure 7 – Subscriber details . 25
Figure 8 – Subscriber message reception sequence . 26
Figure 9 – SecurityGroup management sequence . 27
Figure 10 – Handshake used to pull keys from SKS . 28
Figure 11 – Handshake used to push keys to Publishers and Subscribers . 28
Figure 12 – Handshake with a Security Key Service . 29
Figure 13 – PubSub using network infrastructure . 30
Figure 14 – UDP Multicast overview . 30
Figure 15 – PubSub using broker . 31
Figure 16 – Broker overview . 32
Figure 17 – PubSub component overview . 33
Figure 18 – PubSub mapping specific parameters overview . 34
Figure 19 – PubSub component state dependencies . 35
Figure 20 – PubSubState state machine . 35
Figure 21 – PubSub Information Flow dependency to field representation . 45
Figure 22 – PubSub information flow . 64
Figure 23 – Start of the periodic publisher execution . 67
Figure 24 – Timing offsets in a PublishingInterval . 67
Figure 25 – DataSetOrdering and MaxNetworkMessageSize . 68
Figure 26 – PublishingOffset options for multiple NetworkMessages . 70
Figure 27 – UADP NetworkMessage . 84
Figure 28 – UADP DataSet payload . 90
Figure 29 – DataSetMessage header structure . 91
Figure 30 – Data Key Frame DataSetMessage data . 93

IEC 62541-14:2020 © IEC 2020 – 5 –
Figure 31 – Data Delta Frame DataSetMessage . 94
Figure 32 – Event DataSetMessage . 95
Figure 33 – KeepAlive message . 95
Figure 34 – PublishSubscribe Object Types overview . 111
Figure 35 – PubSub configuration model overview . 118
Figure 36 – PubSub example Objects . 119
Figure 37 – PubSub information flow . 119
Figure 38 – PublishSubscribe Object Types overview . 121
Figure 39 – Published DataSet overview . 125
Figure 40 – PubSubConnectionType overview . 142
Figure 41 – PubSubGroupType overview . 145
Figure 42 – DataSet Writer Model Overview . 153
Figure 43 – DataSet Reader Model overview . 155
Figure 44 – PubSub Diagnostics overview . 165
Figure 45 – PubSubDiagnosticsCounterType . 165
Figure B.1 – Subscriptions in OPC UA Client Server Model . 188
Figure B.2 – Publish Subscribe Model Overview . 189

Table 1 – PubSubState values . 35
Table 2 – PubSubState state machine . 36
Table 3 – DataSetMetaDataType structure . 36
Table 4 – DataSetMetaDataType definition . 37
Table 5 – FieldMetaData structure . 37
Table 6 – DataSetFieldFlags values . 39
Table 7 – DataSetFieldFlags definition . 39
Table 8 – ConfigurationVersionDataType structure . 40
Table 9 – PublishedDataSetDataType structure . 41
Table 10 – PublishedDataSetSourceDataType definition . 41
Table 11 – PublishedVariableDataType structure . 42
Table 12 – PublishedDataItemsDataType structure . 43
Table 13 – PublishedEventsDataType structure . 43
Table 14 – DataSetFieldContentMask values . 44
Table 15 – DataSetFieldContentMask definition . 45
Table 16 – DataSetMessage field representation options . 46
Table 17 – DataSetWriterDataType structure . 47
Table 18 – DataSetWriterTransportDataType definition . 47
Table 19 – DataSetWriterMessageDataType structure . 48
Table 20 – PubSubGroupDataType structure . 49
Table 21 – PubSubGroupDataType definition . 49
Table 22 – WriterGroupDataType structure . 51
Table 23 – WriterGroupDataType definition . 51
Table 24 – WriterGroupTransportDataType definition . 52
Table 25 – WriterGroupMessageDataType structure . 52

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Table 26 – PubSubConnectionDataType structure . 53
Table 27 – ConnectionTransportDataType definition . 54
Table 28 – NetworkAddressDataType structure . 54
Table 29 – NetworkAddressDataType definition . 54
Table 30 – NetworkAddressUrlDataType structure . 54
Table 31 – NetworkAddressUrlDataType definition. 55
Table 32 – ReaderGroupDataType structure . 55
Table 33 – ReaderGroupDataType definition. 55
Table 34 – ReaderGroupTransportDataType definition . 56
Table 35 – ReaderGroupMessageDataType structure . 56
Table 36 – DataSetReaderDataType structure . 59
Table 37 – DataSetReaderTransportDataType structure . 59
Table 38 – DataSetReaderTransportDataType definition . 60
Table 39 – DataSetReaderMessageDataType structure . 60
Table 40 – DataSetReaderMessageDataType definition . 60
Table 41 – SubscribedDataSetDataType structure . 60
Table 42 – SubscribedDataSetDataType Definition . 61
Table 43 – TargetVariablesDataType structure . 61
Table 44 – FieldTargetDataType structure . 62
Table 45 – OverrideValueHandling values . 63
Table 46 – SubscribedDataSetMirrorDataType structure . 63
Table 47 – Source to message input mapping . 64
Table 48 – Message output to target mapping . 65
Table 49 – PubSubConfigurationDataType structure . 65
Table 50 – PubSubConfiguration file content . 66
Table 51 – DataSetOrderingType values . 68
Table 52 – UadpNetworkMessageContentMask values . 69
Table 53 – UadpNetworkMessageContentMask definition . 69
Table 54 – UadpWriterGroupMessageDataType structure . 71
Table 55 – UadpDataSetMessageContentMask values . 71
Table 56 – UadpDataSetMessageContentMask definition . 72
Table 57 – UadpDataSetWriterMessageDataType structure . 73
Table 58 – UadpDataSetReaderMessageDataType structure . 74
Table 59 – JsonNetworkMessageContentMask values . 75
Table 60 – JsonNetworkMessageContentMask definition . 75
Table 61 – JsonWriterGroupMessageDataType structure . 75
Table 62 – JsonDataSetMessageContentMask values . 76
Table 63 – JsonDataSetMessageContentMask definition . 76
Table 64 – JsonDataSetWriterMessageDataType structure . 76
Table 65 – JsonDataSetReaderMessageDataType structure . 77
Table 66 – DatagramConnectionTransportDataType structure . 77
Table 67 – DatagramWriterGroupTransportDataType structure . 78
Table 68 – BrokerConnectionTransportDataType structure . 79

IEC 62541-14:2020 © IEC 2020 – 7 –
Table 69 – BrokerTransportQualityOfService values . 80
Table 70 – BrokerWriterGroupTransportDataType structure . 80
Table 71 – BrokerDataSetWriterTransportDataType structure . 82
Table 72 – BrokerDataSetReaderTransportDataType structure . 83
Table 73 – UADP NetworkMessage . 84
Table 74 – Layout of the key data for UADP message security . 87
Table 75 – Layout of the MessageNonce for AES-CTR . 88
Table 76 – Layout of the counter block for UADP message security . 88
Table 77 – Chunked NetworkMessage payload header . 89
Table 78 – Chunked NetworkMessage payload fields . 89
Table 79 – UADP DataSet payload header . 90
Table 80 – UADP DataSet payload . 91
Table 81 – DataSetMessage header structure . 92
Table 82 – Data Key Frame DataSetMessage structure . 93
Table 83 – Data Delta Frame DataSetMessage structure . 94
Table 84 – Event DataSetMessage structure . 95
Table 85 – Discovery request header structure . 97
Table 86 – Publisher information request message structure . 97
Table 87 – Discovery response header structure. 98
Table 88 – Publisher Endpoints message structure . 98
Table 89 – DataSetMetaData message structure . 98
Table 90 – DataSetWriter configuration message structure . 99
Table 91 – JSON NetworkMessage definition . 99
Table 92 – JSON DataSetMessage definition . 101
Table 93 – JSON DataSetMetaData definition . 102
Table 94 – UADP message transported over UDP . 103
Table 95 – UADP message transported over Ethernet . 104
Table 96 – AMQP standard header fields . 106
Table 97 – OPC UA AMQP standard header QualifiedName Name mappings . 107
Table 98 – OPC UA AMQP header field conversion rules . 108
Table 99 – PublishSubscribe Object definition . 112
Table 100 – PubSubKeyServiceType definition . 112
Table 101 – SecurityGroupType definition . 115
Table 102 – SecurityGroupFolderType definition . 116
Table 103 – PublishSubscribeType definition . 122
Table 104 – HasPubSubConnection ReferenceType . 125
Table 105 – PublishedDataSetType definition . 126
Table 106 – ExtensionFieldsType definition . 127
Table 107 – Well-Known Extension Field Names . 128
Table 108 – DataSetToWriter ReferenceType . 129
Table 109 – PublishedDataItemsType definition . 130
Table 110 – PublishedEventsType definition . 133
Table 111 – DataSetFolderType definition . 134

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Table 112 – PubSubConnectionType definition . 142
Table 113 – ConnectionTransportType definition . 145
Table 114 – PubSubGroupType definition . 146
Table 115 – WriterGroupType definition . 147
Table 116 – HasDataSetWriter ReferenceType . 149
Table 117 – WriterGroupTransportType definition . 149
Table 118 – WriterGroupMessageType definition . 150
Table 119 – ReaderGroupType definition . 150
Table 120 – HasDataSetReader ReferenceType . 152
Table 121 – ReaderGroupTransportType definition . 152
Table 122 – ReaderGroupMessageType Definition . 152
Table 123 – DataSetWriterType definition . 153
Table 124 – DataSetWriterTransportType definition . 154
Table 125 – DataSetWriterMessageType definition . 154
Table 126 – DataSetReaderType definition . 156
Table 127 – DataSetReaderTransportType definition . 157
Table 128 – DataSetReaderMessageType definition . 158
Table 129 – SubscribedDataSetType definition . 160
Table 130 – TargetVariablesType definition . 160
Table 131 – SubscribedDataSetMirrorType definition . 162
Table 132 – PubSubStatusType definition . 163
Table 133 – Status Object definition . 164
Table 134 – PubSubDiagnosticsType . 166
Table 135 – Counters for PubSubDiagnosticsType . 166
Table 136 – DiagnosticsLevel Values . 167
Table 137 – PubSubDiagnosticsCounterType . 168
Table 138 – PubSubDiagnosticsCounterClassification Values . 168
Table 139 – PubSubDiagnosticsRootType . 169
Table 140 – LiveValues for PubSubDiagnosticsRootType . 169
Table 141 – PubSubDiagnosticsConnectionType . 169
Table 142 – LiveValues for PubSubDiagnosticsConnectionType . 170
Table 143 – PubSubDiagnosticsWriterGroupType . 170
Table 144 – Counters for PubSubDiagnosticsWriterGroupType . 170
Table 145 – LiveValues for PubSubDiagnosticsWriterGroupType . 170
Table 146 – PubSubDiagnosticsReaderGroupType . 171
Table 147 – Counters for PubSubDiagnosticsReaderGroupType . 171
Table 148 – LiveValues for PubSubDiagnosticsReaderGroupType . 171
Table 149 – PubSubDiagnosticsDataSetWriterType . 172
Table 150 – Counters for PubSubDiagnosticsDataSetWriterType . 172
Table 151 – LiveValues for PubSubDiagnosticsDataSetWriterType . 172
Table 152 – PubSubDiagnosticsDataSetReaderType . 172
Table 153 – Counters for PubSubDiagnosticsDataSetReaderType . 173
Table 154 – LiveValues for PubSubDiagnosticsDataSetReaderType . 173

IEC 62541-14:2020 © IEC 2020 – 9 –
Table 155 – PubSubStatusEventType definition . 173
Table 156 – PubSubTransportLimitsExceedEventType definition . 174
Table 157 – PubSubCommunicationFailureEventType definition . 174
Table 158 – UadpWriterGroupMessageType definition . 175
Table 159 – UadpDataSetWriterMessageType definition . 176
Table 160 – UadpDataSetReaderMessageType definition . 176
Table 161 – JsonWriterGroupMessageType Definition . 177
Table 162 – JsonDataSetWriterMessageType definition . 177
Table 163 – JsonDataSetReaderMessageType definition . 178
Table 164 – DatagramConnectionTransportType definition . 178
Table 165 – DatagramWriterGroupTransportType definition . 178
Table 166 – BrokerConnectionTra
...