IEC 62541-4:2011
(Main)OPC unified architecture - Part 4: Services
OPC unified architecture - Part 4: Services
IEC 62541-4:2011 defines the OPC Unified Architecture (OPC UA) Services. The Services described 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 part of IEC 62541. IEC 62541-6 specifies one or more concrete mappings supported for implementation. For example, one mapping in IEC 62541-6 is to XML Web Services. In that case the Services described in this part of IEC 62541 appear as the Web service methods in the WSDL contract.
Architecture unifiée OPC - Partie 4: Services
La CEI 62541-4:2011 définit les Services de l'Architecture unifiée OPC (OPC UA). Les Services décrits sont le recueil d'appels de procédures abstraites distantes (RPC Remote Procedure Calls) qui sont mises en oeuvre par les Serveurs OPC UA et qui sont appelées par les Clients OPC UA. Toutes les interactions entre Clients et Serveurs OPC UA ont lieu via ces Services. Les Services définis sont considérés abstraits car pour leur mise en oeuvre aucun mécanisme RPC particulier n'a été spécifié dans cette partie de la CEI 62541. La CEI 62541-6 spécifie les mécanismes de mise en correspondance (mapping). Par exemple, dans la CEI 62541-6 un des mécanismes de mise en correspondance est basé sur l'utilisation des Services Web XML. Dans ce cas, les Services décrits dans la présente partie de la CEI 62541 apparaissent comme les méthodes de service web dans le contrat WSDL.
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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
IEC 62541-4:2011
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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
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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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
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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
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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
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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
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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
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