EN 62541-4:2011

SLOVENSKI STANDARD
01-februar-2012
Poenotena arhitektura OPC - 4. del: Opravila (IEC 62541-4:2011)
OPC unified architecture - Part 4: Services (IEC 62541-4:2011)
OPC Unified Architecture - Teil 4: Dienste (IEC 62541-4:2011)
Architecture unifiée OPC - Partie 4: Services (CEI 62541-4:2011)
Ta slovenski standard je istoveten z: EN 62541-4:2011
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
December 2011
EUROPÄISCHE NORM
ICS 25.040.40; 25.100.01
English version
OPC unified architecture -
Part 4: Services
(IEC 62541-4:2011)
Architecture unifiée OPC -  OPC Unified Architecture -
Partie 4: Services Teil 4: Dienste
(CEI 62541-4:2011) (IEC 62541-4:2011)

This European Standard was approved by CENELEC on 2011-11-24. 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, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62541-4:2011 E
Foreword
The text of document 65E/191/FDIS, future edition 1 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:
(dop) 2012-08-24
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2014-11-24
• latest date by which the national
standards conflicting with the
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 [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the International Standard IEC 62541-4:2011 was approved by CENELEC as a European
Standard without any modification.

- 3 - EN 62541-4:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC/TR 62541-1 2010 OPC unified architecture - CLC/TR 62541-1 2010
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
ISO/IEC 7498-1 Series Information technology - Open Systems - -
Interconnection - Basic Reference Model

IEC 62541-4 ®
Edition 1.0 2011-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
OPC unified architecture –
Part 4: Services
Architecture unifiée OPC –
Partie 4: Services
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XH
ICS 25.040.40; 25.100.01 ISBN 978-2-88912-730-6

– 2 – 62541-4 © IEC:2011
CONTENTS
FOREWORD . 12
INTRODUCTION . 14
1 Scope . 15
2 Normative references . 15
3 Terms, definitions and conventions . 16
3.1 Terms and definitions . 16
3.2 Abbreviations . 16
3.3 Conventions for Service definitions . 17
4 Overview . 18
4.1 Service Set model . 18
4.2 Request/response Service procedures . 21
5 Service Sets . 21
5.1 General . 21
5.2 Service request and response header . 22
5.3 Service results . 22
5.4 Discovery Service Set . 23
5.4.1 Overview . 23
5.4.2 FindServers . 24
5.4.3 GetEndpoints . 26
5.4.4 RegisterServer . 29
5.5 SecureChannel Service Set . 31
5.5.1 Overview . 31
5.5.2 OpenSecureChannel . 33
5.5.3 CloseSecureChannel . 35
5.6 Session Service Set . 35
5.6.1 Overview . 35
5.6.2 CreateSession . 36
5.6.3 ActivateSession . 39
5.6.4 CloseSession . 42
5.6.5 Cancel . 42
5.7 NodeManagement Service Set . 43
5.7.1 Overview . 43
5.7.2 AddNodes. 43
5.7.3 AddReferences . 45
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 . 49
5.8.3 BrowseNext . 51
5.8.4 TranslateBrowsePathsToNodeIds . 53
5.8.5 RegisterNodes . 55
5.8.6 UnregisterNodes . 56
5.9 Query Service Set . 56

62541-4 © IEC:2011 – 3 –
5.9.1 Overview . 56
5.9.2 Querying Views . 57
5.9.3 QueryFirst . 57
5.9.4 QueryNext . 60
5.10 Attribute Service Set . 61
5.10.1 Overview . 61
5.10.2 Read . 61
5.10.3 HistoryRead . 63
5.10.4 Write . 65
5.10.5 HistoryUpdate . 67
5.11 Method Service Set . 68
5.11.1 Overview . 68
5.11.2 Call . 68
5.12 MonitoredItem Service Set . 70
5.12.1 MonitoredItem model . 70
5.12.2 CreateMonitoredItems . 74
5.12.3 ModifyMonitoredItems . 76
5.12.4 SetMonitoringMode . 78
5.12.5 SetTriggering . 79
5.12.6 DeleteMonitoredItems . 80
5.13 Subscription Service Set . 81
5.13.1 Subscription model . 81
5.13.2 CreateSubscription . 88
5.13.3 ModifySubscription . 89
5.13.4 SetPublishingMode . 90
5.13.5 Publish . 91
5.13.6 Republish . 93
5.13.7 TransferSubscriptions . 93
5.13.8 DeleteSubscriptions . 95
6 Service behaviours . 96
6.1 Security . 96
6.1.1 Overview . 96
6.1.2 Obtaining and Installing an Application Instance Certificate . 96
6.1.3 Obtaining and installing a Software Certificate . 97
6.1.4 Determining if a Certificate is Trusted . 99
6.1.5 Validating a Software Certificate . 101
6.1.6 Creating a SecureChannel . 101
6.1.7 Creating a Session . 103
6.1.8 Impersonating a User . 104
6.2 Auditing . 104
6.2.1 Overview . 104
6.2.2 General audit logs . 104
6.2.3 General audit Events . 105
6.2.4 Auditing for Discovery Service Set . 105
6.2.5 Auditing for SecureChannel Service Set . 105
6.2.6 Auditing for Session Service Set . 105
6.2.7 Auditing for NodeManagement Service Set . 106
6.2.8 Auditing for Attribute Service Set . 106
6.2.9 Auditing for Method Service Set . 106

– 4 – 62541-4 © IEC:2011
6.2.10 Auditing for View, Query, MonitoredItem and Subscription Service
Set . 107
6.3 Redundancy . 107
6.3.1 Redundancy overview . 107
6.3.2 Server redundancy overview . 107
6.3.3 Client redundancy. 109
7 Common parameter type definitions . 110
7.1 ApplicationDescription . 110
7.2 ApplicationInstanceCertificate . 110
7.3 BrowseResult . 111
7.4 ContentFilter . 111
7.4.1 ContentFilter structure . 111
7.4.2 ContentFilterResult . 112
7.4.3 FilterOperator . 113
7.4.4 FilterOperand parameters . 119
7.5 Counter . 120
7.6 ContinuationPoint . 121
7.7 DataValue . 121
7.7.1 General . 121
7.7.2 PicoSeconds . 121
7.7.3 SourceTimestamp . 122
7.7.4 ServerTimestamp . 122
7.7.5 StatusCode assigned to a value . 123
7.8 DiagnosticInfo . 123
7.9 EndpointDescription . 124
7.10 ExpandedNodeId . 124
7.11 ExtensibleParameter . 125
7.12 Index . 125
7.13 IntegerId. 125
7.14 MessageSecurityMode . 125
7.15 MonitoringParameters . 125
7.16 MonitoringFilter parameters . 126
7.16.1 Overview . 126
7.16.2 DataChangeFilter . 126
7.16.3 EventFilter . 127
7.16.4 AggregateFilter . 129
7.17 MonitoringMode . 131
7.18 NodeAttributes parameters . 131
7.18.1 Overview . 131
7.18.2 ObjectAttributes parameter . 132
7.18.3 VariableAttributes parameter . 132
7.18.4 MethodAttributes parameter . 133
7.18.5 ObjectTypeAttributes parameter . 133
7.18.6 VariableTypeAttributes parameter . 133
7.18.7 ReferenceTypeAttributes parameter . 134
7.18.8 DataTypeAttributes parameter . 134
7.18.9 ViewAttributes parameter . 134
7.19 NotificationData parameters . 135
7.19.1 Overview . 135

62541-4 © IEC:2011 – 5 –
7.19.2 DataChangeNotification parameter . 135
7.19.3 EventNotificationList parameter . 136
7.19.4 StatusChangeNotification parameter. 136
7.20 NotificationMessage . 136
7.21 NumericRange . 137
7.22 QueryDataSet . 138
7.23 ReadValueId . 138
7.24 ReferenceDescription . 139
7.25 RelativePath . 139
7.26 RequestHeader . 140
7.27 ResponseHeader . 141
7.28 ServiceFault . 141
7.29 SessionAuthenticationToken . 141
7.30 SignatureData . 143
7.31 SignedSoftwareCertificate . 143
7.32 SoftwareCertificate . 143
7.33 StatusCode . 144
7.33.1 General . 144
7.33.2 Common StatusCodes . 146
7.34 TimestampsToReturn . 148
7.35 UserIdentityToken parameters . 148
7.35.1 Overview . 148
7.35.2 AnonymousIdentityToken. 149
7.35.3 UserNameIdentityToken . 149
7.35.4 X509IdentityTokens . 150
7.35.5 IssuedIdentityToken . 150
7.36 UserTokenPolicy . 151
7.37 ViewDescription . 151
Annex A (informative) BNF definitions . 152
Annex B (informative) Content Filter and Query Examples . 154
Bibliography . 172

Figure 1 – Discovery Service Set . 18
Figure 2 – SecureChannel Service Set . 18
Figure 3 – Session Service Set . 19
Figure 4 – NodeManagement Service Set . 19
Figure 5 – View Service Set . 19
Figure 6 – Attribute Service Set . 20
Figure 7 – Method Service Set . 20
Figure 8 – MonitoredItem and Subscription Service Sets . 21
Figure 9 – Discovery process . 24
Figure 10 – Using a Gateway Server . 28
Figure 11 – Registration process – Manually launched servers . 29
Figure 12 – Registration process – Automatically Launched Servers . 30
Figure 13 – SecureChannel and Session Services . 32
Figure 14 – Multiplexing Users on a Session . 37

– 6 – 62541-4 © IEC:2011
Figure 15 – MonitoredItem Model . 70
Figure 16 – Typical delay in change detection. 72
Figure 17 – Triggering Model . 74
Figure 18 – Obtaining and installing an Application Instance Certificate . 97
Figure 19 – Obtaining and Installing a Software Certificate . 98
Figure 20 – Determining if a Application Instance Certificate is Trusted . 101
Figure 21 – Establishing a SecureChannel . 102
Figure 22 – Establishing a Session . 103
Figure 23 – Impersonating a User . 104
Figure 24 – Transparent Redundancy setup . 108
Figure 25 – Non-Transparent Redundancy setup . 108
Figure 26 – Redundancy mode . 109
Figure 27 – Logical layers of a Server . 142
Figure 28 – Obtaining a SessionAuthenticationToken . 142
Figure B.1 – Filter Logic Tree Example . 154
Figure B.2 – Filter Logic Tree Example . 155
Figure B.3 – Example Type Nodes . 157
Figure B.4 – Example Instance Nodes . 158
Figure B.5 – Example 1 Filter . 159
Figure B.6 – Example 2 Filter Logic Tree . 160
Figure B.7 – Example 3 Filter Logic Tree . 162
Figure B.8 – Example 4 Filter Logic Tree . 164
Figure B.9 – Example 5 Filter Logic Tree . 165
Figure B.10 – Example 6 Filter Logic Tree . 166
The corresponding ContentFilter is illustrated in . 168
Figure B.11 – Example 7 Filter Logic Tree . 168
Figure B.12 – Example 8 Filter Logic Tree . 169
Figure 13 – Example 9 Filter Logic Tree . 171

Table 1 – Service Definition Table . 17
Table 2 – Parameter Types defined in IEC 62541-3 . 17
Table 3 – FindServers Service Parameters . 26
Table 4 – GetEndpoints Service Parameters . 28
Table 5 – RegisterServer Service Parameters . 31
Table 6 – RegisterServer Service Result Codes . 31
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 . 39
Table 13 – ActivateSession Service Parameters . 41
Table 14 – ActivateSession Service Result Codes . 42

62541-4 © IEC:2011 – 7 –
Table 15 – CloseSession Service Parameters . 42
Table 16 – CloseSession Service Result Codes . 42
Table 17 – Cancel Service Parameters . 43
Table 18 – AddNodes Service Parameters . 44
Table 19 – AddNodes Service Result Codes . 44
Table 20 – AddNodes Operation Level Result Codes . 45
Table 21 – AddReferences Service Parameters . 46
Table 22 – AddReferences Service Result Codes . 46
Table 23 – AddReferences Operation Level Result Codes . 46
Table 24 – DeleteNodes Service Parameters . 47
Table 25 – DeleteNodes Service Result Codes . 47
Table 26 – DeleteNodes Operation Level Result Codes . 48
Table 27 – DeleteReferences Service Parameters . 48
Table 28 – DeleteReferences Service Result Codes . 49
Table 29 – DeleteReferences Operation Level Result Codes . 49
Table 30 – Browse Service Parameters . 50
Table 31 – Browse Service Result Codes . 51
Table 32 – Browse Operation Level Result Codes . 51
Table 33 – BrowseNext Service Parameters . 52
Table 34 – BrowseNext Service Result Codes . 52
Table 35 – BrowseNext Operation Level Result Codes . 53
Table 36 – TranslateBrowsePathsToNodeIds Service Parameters . 54
Table 37 – TranslateBrowsePathsToNodeIds Service Result Codes . 54
Table 38 – TranslateBrowsePathsToNodeIds Operation Level Result Codes . 55
Table 39 – RegisterNodes Service Parameters . 55
Table 40 – RegisterNodes Service Result Codes . 56
Table 41 – UnregisterNodes Service Parameters . 56
Table 42 – UnregisterNodes Service Result Codes . 56
Table 43 – QueryFirst Request Parameters . 58
Table 44 – QueryFirst Response Parameters . 59
Table 45 – QueryFirst Service Result Codes . 60
Table 46 – QueryFirst Operation Level Result Codes . 60
Table 47 – QueryNext Service Parameters . 61
Table 48 – QueryNext Service Result Codes . 61
Table 49 – Read Service Parameters . 62
Table 50 – Read Service Result Codes . 62
Table 51 – Read Operation Level Result Codes . 63
Table 52 – HistoryRead ServiceParameters . 63
Table 53 – HistoryRead Service Result Codes . 64
Table 54 – HistoryRead Operation Level Result Codes . 65
Table 55 – Write Service Parameters . 66
Table 56 – Write Service Result Codes . 66
Table 57 – Write Operation Level Result Codes . 67

– 8 – 62541-4 © IEC:2011
Table 58 – HistoryUpdate Service Parameters . 67
Table 59 – HistoryUpdate Service Result Codes . 68
Table 60 – HistoryUpdate Operation Level Result Codes . 68
Table 61 – Call Service Parameters . 69
Table 62 – Call Service Result Codes . 69
Table 63 – Call Operation Level Result Codes . 70
Table 64 – CreateMonitoredItems Service Parameters . 75
Table 65 – CreateMonitoredItems Service Result Codes . 76
Table 66 – CreateMonitoredItems Operation Level Result Codes . 76
Table 67 – ModifyMonitoredItems Service Parameters . 77
Table 68 – ModifyMonitoredItems Service Result Codes . 77
Table 69 – ModifyMonitoredItems Operation Level Result Codes . 78
Table 70 – SetMonitoringMode Service Parameters . 78
Table 71 – SetMonitoringMode Service Result Codes . 78
Table 72 – SetMonitoringMode Operation Level Result Codes . 79
Table 73 – SetTriggering Service Parameters . 79
Table 74 – SetTriggering Service Result Codes . 79
Table 75 – SetTriggering Operation Level Result Codes . 80
Table 76 – DeleteMonitoredItems Service Parameters . 80
Table 77 – DeleteMonitoredItems Service Result Codes . 80
Table 78 – DeleteMonitoredItems Operation Level Result Codes . 81
Table 79 – Subscription States . 83
Table 80 – Subscription State Table . 84
Table 81 – State variables and parameters . 86
Table 82 – Functions . 87
Table 83 – CreateSubscription Service Parameters . 88
Table 84 – CreateSubscription Service Result Codes . 89
Table 85 – ModifySubscription Service Parameters . 89
Table 86 – ModifySubscription Service Result Codes . 90
Table 87 – SetPublishingMode Service Parameters . 90
Table 88 – SetPublishingMode Service Result Codes . 90
Table 89 – SetPublishingMode Operation Level Result Codes . 91
Table 90 – Publish Service Parameters . 92
Table 91 – Publish Service Result Codes . 92
Table 92 – Publish Operation Level Result Codes . 92
Table 93 – Republish Service Parameters . 93
Table 94 – Republish Service Result Codes . 93
Table 95 – TransferSubscriptions Service Parameters . 94
Table 96 – TransferSubscriptions Service Result Codes . 94
Table 97 – TransferSubscriptions Operation Level Result Codes . 94
Table 98 – DeleteSubscriptions Service Parameters . 95
Table 99 – DeleteSubscriptions Service Result Codes . 95
Table 100 – DeleteSubscriptions Operation Level Result Codes . 95

62541-4 © IEC:2011 – 9 –
Table 101 – Certificate Validation Steps . 100
Table 102 – Redundancy failover actions . 109
Table 103 – ApplicationDescription . 110
Table 104 – ApplicationInstanceCertificate . 111
Table 105 – BrowseResult . 111
Table 106 – ContentFilter Structure . 112
Table 107 – ContentFilterResult Structure . 112
Table 108 – ContentFilterResult Result Codes . 112
Table 109 – ContentFilterResult Operand Result Codes .
...