OPC Unified Architecture - Part 9: Alarms and Conditions

IEC 62541-9:2020 is available as IEC 62541-9:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 62541-9:2020 specifies the representation of Alarms and Conditions in the OPC Unified Architecture. Included is the Information Model representation of Alarms and Conditions in the OPC UA address space. Other aspects of alarm systems such as alarm philosophy, life cycle, alarm response times, alarm types and many other details are captured in documents such as IEC 62682 and ISA 18.2. The Alarms and Conditions Information Model in this specification is designed in accordance with IEC 62682 and ISA 18.2.
This third edition cancels and replaces the second edition published in 2015. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) added optional engineering units to the definition of RateOfChange alarms;
b) to fulfill the IEC 62682 model, the following elements have been added:
- AlarmConditionType States: Suppression, Silence, OutOfService, Latched;
- AlarmConditionType Properties: OnDelay, OffDelay, FirstInGroup, ReAlarmTime;
- New alarm types: DiscrepencyAlarm, DeviationAlarm, InstrumentDiagnosticAlarm, SystemDiagnosticAlarm.
c) added Annex that specifies how the concepts of this OPC UA part maps to IEC 62682 and ISA 18.2;
d) added new ConditionClasses: Safety, HighlyManaged, Statistical, Testing, Training;
e) added CertificateExpiration AlarmType;
f) added Alarm Metrics model.

Architecture unifiée OPC - Partie 9: Alarmes et Conditions

IEC 62541-9:2020 est disponible sous forme de IEC 62541-9:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 62541-9:2020 spécifie la représentation des Alarmes et des Conditions dans l'Architecture unifiée OPC. Il comprend la représentation par le Modèle d'information des Alarmes et des Conditions dans l'espace d'adressage OPC UA. Les autres aspects des systèmes d'alarme tels que la philosophie d'alarme, le cycle de vie, le temps de réponse de l'alarme, les types d'alarmes et de nombreux autres détails figurent dans des documents tels que l'IEC 62682 et l'ISA 18.2. Le Modèle d'information sur les Alarmes et les Conditions de la présente spécification est conçu conformément à l'IEC 62682 et à l'ISA 18.2. Cette troisième édition annule et remplace la deuxième édition parue en 2015. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) des unités techniques facultatives ont été ajoutées à la définition des alarmes RateOfChange;
b) afin de respecter le modèle IEC 62682, les éléments suivants ont été ajoutés:
- états d'AlarmConditionType: Suppression, Silence, OutOfService, Latched;
- Propriétés d'AlarmConditionType: OnDelay, OffDelay, FirstInGroup, ReAlarmTime;
- nouveaux types d'alarmes: DiscrepencyAlarm, DeviationAlarm, InstrumentDiagnosticAlarm, SystemDiagnosticAlarm;
c) ajout d'une annexe qui spécifie la manière dont les concepts de cette partie d'OPC UA assurent la correspondance avec l'IEC 62682 et l'ISA 18.2;
d) nouvelles ConditionClasses ajoutées: Safety, HighlyManaged, Statistical, Testing, Training;
e) ajout de l'AlarmType CertificateExpiration;
f) ajout d'un modèle de Mesures d'Alarme.

General Information

Status
Published
Publication Date
17-Jun-2020
Current Stage
PPUB - Publication issued
Completion Date
18-Jun-2020
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IEC 62541-9
Edition 3.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
OPC unified architecture –
Part 9: Alarms and Conditions
Architecture unifiée OPC –
Partie 9: Alarmes et Conditions
IEC 62541-9:2020-06(en-fr)
---------------------- Page: 1 ----------------------
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IEC 62541-9
Edition 3.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
OPC unified architecture –
Part 9: Alarms and Conditions
Architecture unifiée OPC –
Partie 9: Alarmes et Conditions
INTERNATIONAL
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– 2 – IEC 62541-9:2020 © IEC 2020
CONTENTS

FOREWORD ......................................................................................................................... 10

1 Scope ............................................................................................................................ 12

2 Normative references .................................................................................................... 12

3 Terms, definitions, abbreviated terms and data types used ............................................ 12

3.1 Terms and definitions ............................................................................................ 12

3.2 Abbreviated terms ................................................................................................. 15

3.3 Data types used .................................................................................................... 15

4 Concepts ....................................................................................................................... 15

4.1 General ................................................................................................................. 15

4.2 Conditions ............................................................................................................ 15

4.3 Acknowledgeable Conditions ................................................................................ 17

4.4 Previous states of Conditions ................................................................................ 18

4.5 Condition state synchronization ............................................................................ 19

4.6 Severity, quality, and comment ............................................................................. 19

4.7 Dialogs ................................................................................................................. 20

4.8 Alarms .................................................................................................................. 20

4.9 Multiple active states ............................................................................................ 22

4.10 Condition instances in the AddressSpace ............................................................. 23

4.11 Alarm and Condition auditing ................................................................................ 24

5 Model ............................................................................................................................ 24

5.1 General ................................................................................................................. 24

5.2 Two-state state machines ..................................................................................... 25

5.3 ConditionVariable ................................................................................................. 27

5.4 ReferenceTypes .................................................................................................... 27

5.4.1 General ......................................................................................................... 27

5.4.2 HasTrueSubState ReferenceType .................................................................. 27

5.4.3 HasFalseSubState ReferenceType ................................................................ 28

5.4.4 HasAlarmSuppressionGroup ReferenceType ................................................. 28

5.4.5 AlarmGroupMember ReferenceType .............................................................. 29

5.5 Condition Model .................................................................................................... 29

5.5.1 General ......................................................................................................... 29

5.5.2 ConditionType ............................................................................................... 30

5.5.3 Condition and branch instances ..................................................................... 34

5.5.4 Disable Method .............................................................................................. 34

5.5.5 Enable Method .............................................................................................. 35

5.5.6 AddComment Method .................................................................................... 35

5.5.7 ConditionRefresh Method .............................................................................. 36

5.5.8 ConditionRefresh2 Method ............................................................................ 38

5.6 Dialog Model ......................................................................................................... 40

5.6.1 General ......................................................................................................... 40

5.6.2 DialogConditionType ..................................................................................... 40

5.6.3 Respond Method ........................................................................................... 42

5.7 Acknowledgeable Condition Model ........................................................................ 42

5.7.1 General ......................................................................................................... 42

5.7.2 AcknowledgeableConditionType .................................................................... 43

5.7.3 Acknowledge Method ..................................................................................... 44

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IEC 62541-9:2020 © IEC 2020 – 3 –

5.7.4 Confirm Method ............................................................................................. 45

5.8 Alarm model.......................................................................................................... 46

5.8.1 General ......................................................................................................... 46

5.8.2 AlarmConditionType ...................................................................................... 47

5.8.3 AlarmGroupType ........................................................................................... 52

5.8.4 Reset Method ................................................................................................ 52

5.8.5 Silence Method .............................................................................................. 53

5.8.6 Suppress Method ........................................................................................... 54

5.8.7 Unsuppress Method ....................................................................................... 55

5.8.8 RemoveFromService Method ......................................................................... 56

5.8.9 PlaceInService Method .................................................................................. 56

5.8.10 ShelvedStateMachineType ............................................................................ 57

5.8.11 LimitAlarmType .............................................................................................. 62

5.8.12 Exclusive limit types ...................................................................................... 64

5.8.13 NonExclusiveLimitAlarmType ......................................................................... 67

5.8.14 Level Alarm ................................................................................................... 68

5.8.15 Deviation Alarm ............................................................................................. 69

5.8.16 Rate of change Alarms .................................................................................. 70

5.8.17 Discrete Alarms ............................................................................................. 71

5.8.18 DiscrepancyAlarmType .................................................................................. 75

5.9 ConditionClasses .................................................................................................. 75

5.9.1 Overview ....................................................................................................... 75

5.9.2 BaseConditionClassType ............................................................................... 76

5.9.3 ProcessConditionClassType .......................................................................... 76

5.9.4 MaintenanceConditionClassType ................................................................... 77

5.9.5 SystemConditionClassType ........................................................................... 77

5.9.6 SafetyConditionClassType ............................................................................. 77

5.9.7 HighlyManagedAlarmConditionClassType ...................................................... 78

5.9.8 TrainingConditionClassType .......................................................................... 78

5.9.9 StatisticalConditionClassType........................................................................ 78

5.9.10 TestingConditionSubClassType ..................................................................... 79

5.10 Audit Events ......................................................................................................... 79

5.10.1 Overview ....................................................................................................... 79

5.10.2 AuditConditionEventType............................................................................... 80

5.10.3 AuditConditionEnableEventType .................................................................... 80

5.10.4 AuditConditionCommentEventType ................................................................ 80

5.10.5 AuditConditionRespondEventType ................................................................. 81

5.10.6 AuditConditionAcknowledgeEventType .......................................................... 81

5.10.7 AuditConditionConfirmEventType .................................................................. 82

5.10.8 AuditConditionShelvingEventType ................................................................. 82

5.10.9 AuditConditionSuppressionEventType ........................................................... 82

5.10.10 AuditConditionSilenceEventType ................................................................... 83

5.10.11 AuditConditionResetEventType ..................................................................... 83

5.10.12 AuditConditionOutOfServiceEventType .......................................................... 83

5.11 Condition Refresh related Events .......................................................................... 84

5.11.1 Overview ....................................................................................................... 84

5.11.2 RefreshStartEventType .................................................................................. 84

5.11.3 RefreshEndEventType ................................................................................... 84

5.11.4 RefreshRequiredEventType ........................................................................... 85

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5.12 HasCondition Reference type ................................................................................ 85

5.13 Alarm and Condition status codes ......................................................................... 86

5.14 Expected A&C server behaviours .......................................................................... 86

5.14.1 General ......................................................................................................... 86

5.14.2 Communication problems .............................................................................. 86

5.14.3 Redundant A&C servers ................................................................................ 87

6 AddressSpace organisation ........................................................................................... 87

6.1 General ................................................................................................................. 87

6.2 EventNotifier and source hierarchy ....................................................................... 87

6.3 Adding Conditions to the hierarchy........................................................................ 88

6.4 Conditions in InstanceDeclarations ....................................................................... 89

6.5 Conditions in a VariableType ................................................................................ 90

7 System State and alarms ............................................................................................... 90

7.1 Overview............................................................................................................... 90

7.2 HasEffectDisable .................................................................................................. 90

7.3 HasEffectEnable ................................................................................................... 91

7.4 HasEffectSuppress ............................................................................................... 91

7.5 HasEffectUnsuppressed ........................................................................................ 92

8 Alarm metrics ................................................................................................................ 93

8.1 Overview............................................................................................................... 93

8.2 AlarmMetricsType ................................................................................................. 93

8.3 AlarmRateVariableType ........................................................................................ 94

8.4 Reset Method ....................................................................................................... 94

Annex A (informative) Recommended localized names ........................................................ 96

A.1 Recommended state names for TwoState variables .............................................. 96

A.1.1 LocaleId "en" ................................................................................................. 96

A.1.2 LocaleId "de" ................................................................................................. 96

A.1.3 LocaleId "fr" ................................................................................................... 97

A.2 Recommended dialog response options ................................................................ 98

Annex B (informative) Examples .......................................................................................... 99

B.1 Examples for Event sequences from Condition instances ...................................... 99

B.1.1 Overview ....................................................................................................... 99

B.1.2 Server maintains current state only ................................................................ 99

B.1.3 Server maintains previous states ................................................................. 100

B.2 AddressSpace examples ..................................................................................... 101

Annex C (informative) Mapping to EEMUA ......................................................................... 104

Annex D (informative) Mapping from OPC A&E to OPC UA A&C ........................................ 105

D.1 Overview............................................................................................................. 105

D.2 Alarms and Events COM UA wrapper .................................................................. 105

D.2.1 Event Areas ................................................................................................. 105

D.2.2 Event sources .............................................................................................. 106

D.2.3 Event categories .......................................................................................... 106

D.2.4 Event attributes ........................................................................................... 107

D.2.5 Event subscriptions ..................................................................................... 107

D.2.6 Condition instances ..................................................................................... 109

D.2.7 Condition Refresh ........................................................................................ 110

D.3 Alarms and Events COM UA proxy ...................................................................... 110

D.3.1 General ....................................................................................................... 110

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IEC 62541-9:2020 © IEC 2020 – 5 –

D.3.2 Server status mapping ................................................................................. 110

D.3.3 Event Type mapping .................................................................................... 110

D.3.4 Event category mapping .............................................................................. 111

D.3.5 Event Category attribute mapping ................................................................ 112

D.3.6 Event Condition mapping ............................................................................. 115

D.3.7 Browse mapping .......................................................................................... 115

D.3.8 Qualified names ........................................................................................... 116

D.3.9 Subscription filters ....................................................................................... 117

Annex E (informative) IEC 62682 Mapping ......................................................................... 119

E.1 Overview............................................................................................................. 119

E.2 Terms ................................................................................................................. 119

E.3 Alarm records and State indications .................................................................... 125

Annex F (informative) System State ................................................................................... 126

F.1 Overview............................................................................................................. 126

F.2 SystemStateStateMachineType ........................................................................... 127

Bibliography ........................................................................................................................ 131

Figure 1 – Base Condition state model .................................................................................. 16

Figure 2 – AcknowledgeableConditions state model .............................................................. 17

Figure 3 – Acknowledge state model ..................................................................................... 18

Figure 4 – Confirmed Acknowledge state model .................................................................... 18

Figure 5 – Alarm state machine model .................................................................................. 21

Figure 6 – Typical Alarm Timeline example ........................................................................... 22

Figure 7 – Multiple active states example ............................................................................. 23

Figure 8 – ConditionType hierarchy ...................................................................................... 25

Figure 9 – Condition model ................................................................................................... 30

Figure 10 – DialogConditionType overview ........................................................................... 40

Figure 11 – AcknowledgeableConditionType overview .......................................................... 43

Figure 12 – AlarmConditionType Hierarchy Model ................................................................. 47

Figure 13 – Alarm Model ....................................................................................................... 48

Figure 14 – Shelve state transitions ...................................................................................... 58

Figure 15 – ShelvedStateMachineType model ....................................................................... 58

Figure 16 – LimitAlarmType .................................................................................................. 63

Figure 17 – ExclusiveLimitStateMachineType ....................................................................... 64

Figure 18 – ExclusiveLimitAlarmType ................................................................................... 66

Figure 19 – NonExclusiveLimitAlarmType ............................................................................. 67

Figure 20 – DiscreteAlarmType Hierarchy ............................................................................. 72

Figure 21 – ConditionClass type hierarchy ............................................................................ 76

Figure 22 – AuditEvent hierarchy .......................................................................................... 79

Figure 23 – Refresh Related Event Hierarchy ....................................................................... 84

Figure 24 – Typical HasNotifier Hierarchy ............................................................................. 88

Figure 25 – Use of HasCondition in a HasNotifier hierarchy .................................................. 89

Figure 26 – Use of HasCondition in an InstanceDeclaration .................................................. 89

Figure 27 – Use of HasCondition in a VariableType .............................................................. 90

Figure B.1 – Single state example......................................................................................... 99

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– 6 – IEC 62541-9:2020 © IEC 2020

Figure B.2 – Previous state example ................................................................................... 100

Figure B.3 – HasCondition used with Condition instances ................................................... 102

Figure B.4 – HasCondition reference to a Condition type .................................................... 103

Figure B.5 – HasCondition used with an instance declaration ............................................. 103

Figure D.1 – The type model of a wrapped COM A&E server .............................................. 107

Figure D.2 – Mapping UA Event Types to COM A&E Event Types ....................................... 111

Figure D.3 – Example mapping of UA Event Types to COM A&E categories ....................... 112

Figure D.4 – Example mapping of UA Event Types to A&E categories with attributes .......... 115

Figure F.1 – SystemState transitions .................................................................................. 127

Figure F.2 – SystemStateStateMachineType Model ............................................................ 128

Table 1 – Parameter types defined in IEC 62541-3 ............................................................... 15

Table 2 – Parameter types defined in IEC 62541-4 .........................................................

...

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