EN 62541-4:2015

SLOVENSKI STANDARD
01-oktober-2015
1DGRPHãþD
SIST EN 62541-4:2012
Enotna arhitektura OPC - 4. del: Storitve (IEC 62541-4:2015)
OPC Unified Architecture - Part 4: Services (IEC 62541-4:2015)
OPC unified architecture - Part 4: Services (IEC 62541-4:2015)
Architecture unifiée OPC - Partie 4: Services (IEC 62541-4:2015)
Ta slovenski standard je istoveten z: EN 62541-4:2015
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 62541-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2015
ICS 35.100; 25.040.40 Supersedes EN 62541-4:2011
English Version
OPC unified architecture - Part 4: Services
(IEC 62541-4:2015)
Architecture unifiée OPC - Partie 4: Services OPC Unified Architecture - Teil 4: Dienste
(IEC 62541-4:2015) (IEC 62541-4:2015)
This European Standard was approved by CENELEC on 2015-04-29. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62541-4:2015 E
Foreword
The text of document 65E/375/CDV, future edition 2 of IEC 62541-4, 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 (dop) 2016-01-29
national level by publication of an identical national
standard or by endorsement
(dow) 2018-04-29
• latest date by which the national standards conflicting with
the document have to be withdrawn

This document supersedes EN 62541-4:2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).
Endorsement notice
The text of the International Standard IEC 62541-4:2015 was approved by CENELEC as a European
Standard without any modification.

- 3 - EN 62541-4:2015
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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 - CLC/TR 62541-1 -
Part 1: Overview and concepts
IEC/TR 62541-2 - OPC unified architecture - CLC/TR 62541-2 -
Part 2: Security model
IEC 62541-3 -  OPC unified architecture - EN 62541-3 -
Part 3: Address Space Model
IEC 62541-5 -  OPC unified architecture - EN 62541-5 -
Part 5: Information Model
IEC 62541-6 -  OPC unified architecture - EN 62541-6 -
Part 6: Mappings
IEC 62541-7 -  OPC unified architecture - EN 62541-7 -
Part 7: Profiles
IEC 62541-8 -  OPC Unified Architecture - EN 62541-8 -
Part 8: Data Access
IEC 62541-11 -  OPC unified architecture - EN 62541-11 -
Part 11: Historical Access
IEC 62541-13 -  OPC unified architecture - EN 62541-13 -
Part 13: Aggregates
IEC 62541-4 ®
Edition 2.0 2015-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
OPC Unified Architecture –
Part 4: Services
Architecture Unifiée OPC –
Partie 4: Services
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100 ISBN 978-2-8322-2369-7

– 2 – IEC 62541-4:2015 © IEC 2015
CONTENTS
FOREWORD . 12
1 Scope . 14
2 Normative references . 14
3 Terms, definitions and conventions . 15
3.1 Terms and definitions . 15
3.2 Abbreviations and symbols . 15
3.3 Conventions for Service definitions . 16
4 Overview . 17
4.1 Service Set model . 17
4.2 Request/response Service procedures . 21
5 Service Sets . 21
5.1 General . 21
5.2 Service request and response header . 21
5.3 Service results . 21
5.4 Discovery Service Set . 23
5.4.1 Overview . 23
5.4.2 FindServers . 24
5.4.3 GetEndpoints . 25
5.4.4 RegisterServer . 28
5.5 SecureChannel Service Set . 31
5.5.1 Overview . 31
5.5.2 OpenSecureChannel . 32
5.5.3 CloseSecureChannel . 35
5.6 Session Service Set . 36
5.6.1 Overview . 36
5.6.2 CreateSession . 36
5.6.3 ActivateSession . 40
5.6.4 CloseSession . 43
5.6.5 Cancel . 43
5.7 NodeManagement Service Set . 44
5.7.1 Overview . 44
5.7.2 AddNodes . 44
5.7.3 AddReferences . 46
5.7.4 DeleteNodes . 47
5.7.5 DeleteReferences . 48
5.8 View Service Set . 49
5.8.1 Overview . 49
5.8.2 Browse . 50
5.8.3 BrowseNext . 52
5.8.4 TranslateBrowsePathsToNodeIds . 54
5.8.5 RegisterNodes . 56
5.8.6 UnregisterNodes . 57
5.9 Query Service Set . 57
5.9.1 Overview . 57
5.9.2 Querying Views . 58
5.9.3 QueryFirst . 58

IEC 62541-4:2015 © IEC 2015 – 3 –
5.9.4 QueryNext . 62
5.10 Attribute Service Set . 63
5.10.1 Overview . 63
5.10.2 Read . 63
5.10.3 HistoryRead . 65
5.10.4 Write . 67
5.10.5 HistoryUpdate . 69
5.11 Method Service Set . 70
5.11.1 Overview . 70
5.11.2 Call . 71
5.12 MonitoredItem Service Set . 73
5.12.1 MonitoredItem model . 73
5.12.2 CreateMonitoredItems . 79
5.12.3 ModifyMonitoredItems . 81
5.12.4 SetMonitoringMode . 83
5.12.5 SetTriggering . 84
5.12.6 DeleteMonitoredItems . 85
5.13 Subscription Service Set . 86
5.13.1 Subscription model . 86
5.13.2 CreateSubscription . 93
5.13.3 ModifySubscription . 94
5.13.4 SetPublishingMode . 95
5.13.5 Publish . 96
5.13.6 Republish . 98
5.13.7 TransferSubscriptions . 98
5.13.8 DeleteSubscriptions . 100
6 Service behaviours . 101
6.1 Security . 101
6.1.1 Overview . 101
6.1.2 Obtaining and Installing an Application Instance Certificate . 101
6.1.3 Determining if a Certificate is Trusted . 102
6.1.4 Creating a SecureChannel . 104
6.1.5 Creating a Session . 106
6.1.6 Impersonating a User . 107
6.2 Software Certificates . 107
6.2.1 Overview . 107
6.2.2 Obtaining and Installing a Software Certificate . 107
6.2.3 Validating a Software Certificate . 109
6.3 Auditing . 109
6.3.1 Overview . 109
6.3.2 General audit logs. 109
6.3.3 General audit Events . 109
6.3.4 Auditing for Discovery Service Set . 110
6.3.5 Auditing for SecureChannel Service Set . 110
6.3.6 Auditing for Session Service Set . 110
6.3.7 Auditing for NodeManagement Service Set . 111
6.3.8 Auditing for Attribute Service Set . 111
6.3.9 Auditing for Method Service Set . 111
6.3.10 Auditing for View, Query, MonitoredItem and Subscription Service Set . 112

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6.4 Redundancy . 112
6.4.1 Redundancy overview . 112
6.4.2 Server redundancy overview . 112
6.4.3 Client redundancy . 116
6.4.4 Network redundancy . 116
6.5 Re-establishing connections . 117
7 Common parameter type definitions . 118
7.1 ApplicationDescription . 118
7.2 ApplicationInstanceCertificate . 118
7.3 BrowseResult . 119
7.4 ContentFilter . 119
7.4.1 ContentFilter structure . 119
7.4.2 ContentFilterResult . 120
7.4.3 FilterOperator . 121
7.4.4 FilterOperand parameters . 127
7.5 Counter . 128
7.6 ContinuationPoint . 129
7.7 DataValue . 129
7.7.1 General. 129
7.7.2 PicoSeconds . 130
7.7.3 SourceTimestamp . 130
7.7.4 ServerTimestamp . 130
7.7.5 StatusCode assigned to a value . 131
7.8 DiagnosticInfo . 131
7.9 EndpointDescription . 132
7.10 ExpandedNodeId . 133
7.11 ExtensibleParameter . 133
7.12 Index . 134
7.13 IntegerId . 134
7.14 MessageSecurityMode . 134
7.15 MonitoringParameters . 134
7.16 MonitoringFilter parameters . 135
7.16.1 Overview . 135
7.16.2 DataChangeFilter . 136
7.16.3 EventFilter . 136
7.16.4 AggregateFilter . 139
7.17 MonitoringMode . 140
7.18 NodeAttributes parameters . 140
7.18.1 Overview . 140
7.18.2 ObjectAttributes parameter . 141
7.18.3 VariableAttributes parameter . 141
7.18.4 MethodAttributes parameter . 142
7.18.5 ObjectTypeAttributes parameter . 142
7.18.6 VariableTypeAttributes parameter . 142
7.18.7 ReferenceTypeAttributes parameter . 143
7.18.8 DataTypeAttributes parameter . 143
7.18.9 ViewAttributes parameter . 143
7.19 NotificationData parameters . 144
7.19.1 Overview . 144

IEC 62541-4:2015 © IEC 2015 – 5 –
7.19.2 DataChangeNotification parameter . 144
7.19.3 EventNotificationList parameter . 145
7.19.4 StatusChangeNotification parameter . 145
7.20 NotificationMessage . 145
7.21 NumericRange . 146
7.22 QueryDataSet . 147
7.23 ReadValueId . 147
7.24 ReferenceDescription. 148
7.25 RelativePath . 149
7.26 RequestHeader . 149
7.27 ResponseHeader . 151
7.28 ServiceFault . 151
7.29 SessionAuthenticationToken . 151
7.30 SignatureData . 153
7.31 SignedSoftwareCertificate . 153
7.32 SoftwareCertificate . 153
7.33 StatusCode . 154
7.33.1 General. 154
7.33.2 Common StatusCodes . 156
7.34 TimestampsToReturn . 159
7.35 UserIdentityToken parameters . 159
7.35.1 Overview . 159
7.35.2 AnonymousIdentityToken . 160
7.35.3 UserNameIdentityToken . 160
7.35.4 X509IdentityTokens . 161
7.35.5 IssuedIdentityToken . 161
7.36 UserTokenPolicy . 162
7.37 ViewDescription . 163
Annex A (informative) BNF definitions . 164
A.1 Overview over BNF . 164
A.2 BNF of RelativePath . 164
A.3 BNF of NumericRange . 165
Annex B (informative) Content Filter and Query Examples . 166
B.1 Simple ContentFilter examples . 166
B.1.1 Overview . 166
B.1.2 Example 1. 166
B.1.3 Example 2. 167
B.2 Complex Examples of Query Filters . 167
B.2.1 Overview . 167
B.2.2 Used type model . 168
B.2.3 Example Notes . 170
B.2.4 Example 1. 171
B.2.5 Example 2. 172
B.2.6 Example 3. 173
B.2.7 Example 4. 175
B.2.8 Example 5. 176
B.2.9 Example 6. 178
B.2.10 Example 7. 179
B.2.11 Example 8. 181

– 6 – IEC 62541-4:2015 © IEC 2015
B.2.12 Example 9. 182

Figure 1 – Discovery Service Set . 17
Figure 2 – SecureChannel Service Set. 18
Figure 3 – Session Service Set . 18
Figure 4 – NodeManagement Service Set . 18
Figure 5 – View Service Set . 19
Figure 6 – Attribute Service Set . 19
Figure 7 – Method Service Set . 20
Figure 8 – MonitoredItem and Subscription Service Sets . 20
Figure 9 – Discovery process . 23
Figure 10 – Using a Gateway Server . 27
Figure 11 – The Registration Process – Manually Launched Servers . 28
Figure 12 – The Registration Process – Automatically Launched Servers . 29
Figure 13 – SecureChannel and Session Services . 32
Figure 14 – Multiplexing Users on a Session . 38
Figure 15 – MonitoredItem Model . 74
Figure 16 – Typical delay in change detection . 75
Figure 17 – Queue overflow handling . 77
Figure 18 – Triggering Model . 78
Figure 19 – Obtaining and Installing an Application Instance Certificate . 102
Figure 20 – Determining if a Application Instance Certificate is Trusted . 104
Figure 21 – Establishing a SecureChannel . 105
Figure 22 – Establishing a Session . 106
Figure 23 – Impersonating a User . 107
Figure 24 – Obtaining and Installing a Software Certificate . 108
Figure 25 – Transparent Redundancy setup . 113
Figure 26 – Non-Transparent Redundancy setup . 113
Figure 27 – Server proxy for redundancy . 116
Figure 28 – Reconnect Sequence . 117
Figure 29 – Logical layers of a Server . 152
Figure 30 – Obtaining a SessionAuthenticationToken . 152
Figure B.1 – Filter Logic Tree Example . 166
Figure B.2 – Filter Logic Tree Example . 167
Figure B.3 – Example Type Nodes . 169
Figure B.4 – Example Instance Nodes . 170
Figure B.5 – Example 1 Filter . 171
Figure B.6 – Example 2 Filter Logic Tree . 172
Figure B.7 – Example 3 Filter Logic Tree . 174
Figure B.8 – Example 4 Filter Logic Tree . 176
Figure B.9 – Example 5 Filter Logic Tree . 177
Figure B.10 – Example 6 Filter Logic Tree . 178
Figure B.11 – Example 7 Filter Logic Tree . 180

IEC 62541-4:2015 © IEC 2015 – 7 –
Figure B.12 – Example 8 Filter Logic Tree . 181
Figure B.13 – Example 9 Filter Logic Tree . 183

Table 1 – Service Definition Table . 16
Table 2 – Parameter Types defined in IEC 62541-3 . 17
Table 3 – FindServers Service Parameters . 25
Table 4 – GetEndpoints Service Parameters . 27
Table 5 – RegisterServer Service Parameters . 30
Table 6 – RegisterServer Service Result Codes . 30
Table 7 – OpenSecureChannel Service Parameters . 34
Table 8 – OpenSecureChannel Service Result Codes . 35
Table 9 – CloseSecureChannel Service Parameters . 35
Table 10 – CloseSecureChannel Service Result Codes . 35
Table 11 – CreateSession Service Parameters . 38
Table 12 – CreateSession Service Result Codes . 40
Table 13 – ActivateSession Service Parameters . 42
Table 14 – ActivateSession Service Result Codes . 43
Table 15 – CloseSession Service Parameters . 43
Table 16 – CloseSession Service Result Codes . 43
Table 17 – Cancel Service Parameters . 44
Table 18 – AddNodes Service Parameters . 45
Table 19 – AddNodes Service Result Codes . 45
Table 20 – AddNodes Operation Level Result Codes . 46
Table 21 – AddReferences Service Parameters . 46
Table 22 – AddReferences Service Result Codes . 47
Table 23 – AddReferences Operation Level Result Codes . 47
Table 24 – DeleteNodes Service Parameters . 48
Table 25 – DeleteNodes Service Result Codes . 48
Table 26 – DeleteNodes Operation Level Result Codes . 48
Table 27 – DeleteReferences Service Parameters . 49
Table 28 – DeleteReferences Service Result Codes . 49
Table 29 – DeleteReferences Operation Level Result Codes . 49
Table 30 – Browse Service Parameters . 51
Table 31 – Browse Service Result Codes. 52
Table 32 – Browse Operation Level Result Codes. 52
Table 33 – BrowseNext Service Parameters . 53
Table 34 – BrowseNext Service Result Codes . 53
Table 35 – BrowseNext Operation Level Result Codes . 54
Table 36 – TranslateBrowsePathsToNodeIds Service Parameters . 55
Table 37 – TranslateBrowsePathsToNodeIds Service Result Codes . 55
Table 38 – TranslateBrowsePathsToNodeIds Operation Level Result Codes . 56
Table 39 – RegisterNodes Service Parameters . 56
Table 40 – RegisterNodes Service Result Codes . 57

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Table 41 – UnregisterNodes Service Parameters . 57
Table 42 – UnregisterNodes Service Result Codes . 57
Table 43 – QueryFirst Request Parameters . 60
Table 44 – QueryFirst Response Parameters . 61
Table 45 – QueryFirst Service Result Codes . 62
Table 46 – QueryFirst Operation Level Result Codes . 62
Table 47 – QueryNext Service Parameters . 63
Table 48 – QueryNext Service Result Codes. 63
Table 49 – Read Service Parameters . 64
Table 50 – Read Service Result Codes . 64
Table 51 – Read Operation Level Result Codes . 65
Table 52 – HistoryRead Service Parameters . 66
Table 53 – HistoryRead Service Result Codes . 67
Table 54 – HistoryRead Operation Level Result Codes . 67
Table 55 – Write Service Parameters . 68
Table 56 – Write Service Result Codes . 69
Table 57 – Write Operation Level Result Codes . 69
Table 58 – HistoryUpdate Service Parameters . 70
Table 59 – HistoryUpdate Service Result Codes . 70
Table 60 – HistoryUpdate Operation Level Result Codes . 70
Table 61 – Call Service Parameters . 72
Table 62 – Call Service Result Codes . 72
Table 63 – Call Operation Level Result Codes . 73
Table 64 – CreateMonitoredItems Service Parameters . 80
Table 65 – CreateMonitoredItems Service Result Codes . 80
Table 66 – CreateMonitoredItems Operation Level Result Codes . 81
Table 67 – ModifyMonitoredItems Service Parameters . 82
Table 68 – ModifyMonitoredItems Service Result Codes . 82
Table 69 – ModifyMonitoredItems Operation Level Result Codes . 83
Table 70 – SetMonitoringMode Service Parameters . 83
Table 71 – SetMonitoringMode Service Result Codes . 83
Table 72 – SetMonitoringMode Operation Level Result Codes . 84
Table 73 – SetTriggering Service Parameters . 84
Table 74 – SetTriggering Service Result Codes . 85
Table 75 – SetTriggering Operation Level Result Codes . 85
Table 76 – DeleteMonitoredItems Service Parameters . 85
Table 77 – DeleteMonitoredItems Service Result Codes . 86
Table 78 – DeleteMonitoredItems Operation Level Result Codes . 86
Table 79 – Subscription States . 88
Table 80 – Subscri
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