IEC 62541-9:2020
(Main)OPC Unified Architecture - Part 9: Alarms and Conditions
OPC Unified Architecture - Part 9: Alarms and Conditions
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
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.
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IEC 62541-9 ®
Edition 3.0 2020-06
REDLINE VERSION
INTERNATIONAL
STANDARD
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OPC unified architecture –
Part 9: Alarms and Conditions
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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International Standards for all electrical, electronic and related technologies.
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IEC 62541-9 ®
Edition 3.0 2020-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
OPC unified architecture –
Part 9: Alarms and Conditions
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.05 ISBN 978-2-8322-8554-1
– 2 – IEC 62541-9:2020 RLV © IEC 2020
CONTENTS
FOREWORD . 10
1 Scope . 13
2 Normative references . 13
3 Terms, definitions, abbreviated terms and data types used . 13
3.1 Terms and definitions . 13
3.2 Abbreviated terms . 16
3.3 Data types used . 16
4 Concepts . 16
4.1 General . 16
4.2 Conditions . 17
4.3 Acknowledgeable Conditions . 18
4.4 Previous states of Conditions . 20
4.5 Condition state synchronization . 20
4.6 Severity, quality, and comment . 21
4.7 Dialogs . 21
4.8 Alarms . 21
4.9 Multiple active states . 23
4.10 Condition instances in the AddressSpace . 24
4.11 Alarm and Condition auditing . 25
5 Model . 25
5.1 General . 25
5.2 Two-state state machines . 26
5.3 ConditionVariable . 28
5.4 Substate ReferenceTypes . 28
5.4.1 General . 28
5.4.2 HasTrueSubState ReferenceType . 28
5.4.3 HasFalseSubState ReferenceType . 29
5.4.4 HasAlarmSuppressionGroup ReferenceType . 29
5.4.5 AlarmGroupMember ReferenceType . 30
5.5 Condition Model . 30
5.5.1 General . 30
5.5.2 ConditionType . 31
5.5.3 Condition and branch instances . 35
5.5.4 Disable Method . 35
5.5.5 Enable Method . 36
5.5.6 AddComment Method . 36
5.5.7 ConditionRefresh Method . 38
5.5.8 ConditionRefresh2 Method . 39
5.6 Dialog Model . 41
5.6.1 General . 41
5.6.2 DialogConditionType . 41
5.6.3 Respond Method . 43
5.7 Acknowledgeable Condition Model . 44
5.7.1 General . 44
5.7.2 AcknowledgeableConditionType . 44
5.7.3 Acknowledge Method . 45
5.7.4 Confirm Method . 46
5.8 Alarm model. 48
5.8.1 General . 48
5.8.2 AlarmConditionType . 48
5.8.3 AlarmGroupType . 53
5.8.4 Reset Method . 53
5.8.5 Silence Method . 54
5.8.6 Suppress Method . 55
5.8.7 Unsuppress Method . 56
5.8.8 RemoveFromService Method . 57
5.8.9 PlaceInService Method . 57
5.8.10 ShelvedStateMachineType . 58
5.8.11 LimitAlarmType . 63
5.8.12 Exclusive limit types . 65
5.8.13 NonExclusiveLimitAlarmType . 68
5.8.14 Level Alarm . 69
5.8.15 Deviation Alarm . 70
5.8.16 Rate of change Alarms . 71
5.8.17 Discrete Alarms . 73
5.8.18 DiscrepancyAlarmType . 76
5.9 ConditionClasses . 77
5.9.1 Overview . 77
5.9.2 BaseConditionClassType . 77
5.9.3 ProcessConditionClassType . 78
5.9.4 MaintenanceConditionClassType . 78
5.9.5 SystemConditionClassType . 78
5.9.6 SafetyConditionClassType . 79
5.9.7 HighlyManagedAlarmConditionClassType . 79
5.9.8 TrainingConditionClassType . 79
5.9.9 StatisticalConditionClassType. 80
5.9.10 TestingConditionSubClassType . 80
5.10 Audit Events . 80
5.10.1 Overview . 80
5.10.2 AuditConditionEventType. 81
5.10.3 AuditConditionEnableEventType . 82
5.10.4 AuditConditionCommentEventType . 82
5.10.5 AuditConditionRespondEventType . 82
5.10.6 AuditConditionAcknowledgeEventType . 83
5.10.7 AuditConditionConfirmEventType . 83
5.10.8 AuditConditionShelvingEventType . 84
5.10.9 AuditConditionSuppressionEventType . 84
5.10.10 AuditConditionSilenceEventType . 84
5.10.11 AuditConditionResetEventType . 85
5.10.12 AuditConditionOutOfServiceEventType . 85
5.11 Condition Refresh related Events . 85
5.11.1 Overview . 85
5.11.2 RefreshStartEventType . 86
5.11.3 RefreshEndEventType . 86
5.11.4 RefreshRequiredEventType . 86
– 4 – IEC 62541-9:2020 RLV © IEC 2020
5.12 HasCondition Reference type . 87
5.13 Alarm and Condition status codes . 87
5.14 Expected
...
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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
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IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
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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
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.05 ISBN 978-2-8322-8465-0
– 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
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 Trai
...
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