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Scope: Core (OPC-10000-*) All specs

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OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts

2.1.5 Broker

Broker intermediary program module that routes NetworkMessages from Publishers to Subscribers Note 1 to entry: Brokers are building blocks of Message Oriented Middleware
OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts

4.2 General

changes. In addition to the ClientServer model, OPC UA also supports information transfer from Publishers to Subscribers using the PubSub model
OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts

5.5 Publish-Subscribe

communication. With PubSub, OPC UA Applications do not directly exchange requests and responses. Instead, Publishers send messages to a Message Oriented Middleware , without knowledge of what, if any, Subscribers there ... types of data, and process messages that contain this data, without knowledge of what Publishers there are. Message Oriented Middleware is software or hardware infrastructure supporting sending and receiving messages
OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts

5.6 Synergy of models

Client . Above all, the PubSub Information Model for configuration promotes the configuration of Publishers and Subscribers using the OPC UA ClientServer model. Figure 7 depicts a single OPC UA Application ... PubSub communication does not require such a role dependency. I.e., Clients can be Publishers and Servers can be Subscribers . In fact, there is no necessity for Publishers or Subscribers
OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts

5.7.1 General

independent interactions between UA Applications (i.e. between Clients and Servers and between Publishers and Subscribers ). However, as the number of Applications in a given system grows, there are advantages
OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts

5.7.8 Security Key Service (SKS)

Security Key Service (SKS) OPC UA Publishers and Subscribers utilize a security key service (SKS) to secure the messages sent between them. The SKS is responsible for managing the keys ... centralized where a single SKS is used by a group of Publishers and Subscribers in a system. The SKS is described
OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model

4.5.3.2 Broker-less

establish application Authentication as well as user Authentication . This approach allows all applications ( Publishers and/or Subscribers ) in a SecurityGroup to share information. An SKS could be part of a Publisher ... need to be replaced periodically, where the period is determined by the number of Publishers in a SecurityGroup and the frequency of messages. To ensure that Publishers and Subscribers
OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model

4.5.3.3 Broker

Middleware . In many cases the Middleware requires the authorization of both the Publishers and the Subscribers before they can interact with the Broker . The Broker interactions can provide security mechanisms
OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings

H.1 Overview

PubSub defined in OPC 10000-14 . The expectation is all encoders used for Publishers support all four encodings and all decoders for Subscribers support the ReversibleEncoding, CompactEncoding and VerboseEncodings
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

3.1.2 DataSetClass

entry: A DataSetClass is used to type DataSets for use in several Publishers and for filtering in Subscribers
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

4.1 Fields of application

Fields of application In PubSub the participating OPC UA Applications with their roles as Publishers and Subscribers are decoupled. The number of Subscribers receiving data from a Publisher does
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

4.3 Decoupling by use of middleware

PubSub the participating OPC UA Applications can assume the roles Publisher and Subscriber . Publishers are the sources of data, while Subscribers consume that data. Communication in PubSub is message-based ... Publishers send messages to a Message Oriented Middleware , without knowledge of what, if any, Subscribers there may be. Similarly, Subscribers express interest in specific types of data, and process messages
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

4.4 Synergy of models

Above all, the PubSub Information Model for configuration (see 9 ) promotes the configuration of Publishers and Subscribers using the OPC UA Client Server model. Nevertheless, the PubSub communication does ... require such a role dependency. I.e., OPC UA Clients can be Publishers and OPC UA Servers can be Subscribers . In fact, there is no necessity for Publishers or Subscribers
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

5.1 General

DataSet to multiple Message Oriented Middleware and a Subscriber may receive messages from multiple Publishers . Figure 2 - Publisher and Subscriber entities Publishers and Subscribers are loosely coupled. They often will ... data acquisition parameters are called PublishedDataSet . DataSet , DataSetMetaData and PublishedDataSet are detailed in 5.2 . Publishers and Subscribers are typically configured through a configuration tool. The configuration can be done through
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

5.3.6 Transport security

middleware (see 5.4.6.2.2 ), confidentiality and integrity can be ensured with the transport security between Publishers and the Broker as well as Subscribers and the Broker . The Broker level security ... addition requires all Publishers and Subscribers to have credentials that grant them access to a Broker resource. Transport security may be hop-by-hop security with some risk
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

5.3.7 SecurityGroup

message security settings and security keys for a subset of NetworkMessages exchanged between Publishers and Subscribers . The security keys are used to encrypt and decrypt NetworkMessages and to generate ... DataSetMetaData . The metadata for a SecurityGroupId includes the EndpointDescription of the responsible SKS. Publishers and Subscribers use the EndpointDescription to access the SKS and the SecurityGroupId to obtain the security
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

5.4.4 Configuration Tool

also the frequency the messages are sent. Subscribers can use discovery mechanisms to find Publishers and to get the DataSetMetaData necessary to understand the messages. One example are HMI applications ... binary file using the UABinaryFileDataType . Such a configuration can be used to configure Publishers and Subscribers if they do not have a online configuration interface or are configured through product
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

5.4.5.1 General

keys for a SecurityGroup into a Publisher or Subscriber . The Method is exposed by Publishers or Subscribers that have no OPC UA Client functionality. The Method is part
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

5.4.5.2 SecurityGroup Management

SecurityGroup . An example for setting up a SecurityGroup and the configuration of affected Publishers and Subscribers is shown in Figure 10 . Figure 10 - SecurityGroup management sequence To secure NetworkMessages ... Roles and Permissions in the SKS. To set the SecurityGroup relation on the Publishers and Subscribers , the SecurityGroupId and the SKS EndpointDescriptions are configured in a PubSub group
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

5.4.5.3 Key acquisition handshakes

shown in Figure 11 . The handshake to push the keys from an SKS to Publishers and Subscribers is shown in Figure 12 . Figure 11 - Handshake used to pull keys from ... defined in OPC 10000-4 . Figure 12 - Handshake used to push keys to Publishers and Subscribers To push keys, the SKS creates an encrypted connection to a Publisher or Subscriber
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

5.4.5.4 Authorization Services and Security Key Service

check the Permissions assigned to the SecurityGroup Object identified by the GetSecurityKeys Method arguments. Publishers and Subscribers can request keys if the Access Token they provide is mapped to Roles
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

5.4.6.3.2 Broker-based model

this model the Message Oriented Middleware will be a Broker that relays NetworkMessages from Publishers to Subscribers . The Broker may also be able to queue messages and send the same ... Broker based communication model can be ensured at two levels: transport security between Publishers or Subscribers and the Broker, or message security as end-to-end security between Publisher
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.2.2 MessageTypes

defined in 7.2.5.2 . The discovery messages are required to send discovery information from the Publishers to the Subscribers that do not have out of band knowledge about available Publishers
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.2.3 SequenceNumber in headers

receive messages for two times the message receive timeout to deal with Publishers or brokers that are out of service and were not able to continue from the last used
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.2.4.2 MessageType mapping

discovery announce messages are required to send discovery information from the Publishers to the Subcribers . The probe messages are used for broker-less transport protocols like UDP or a Message
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.2.4.4.2 NetworkMessage layout

indicated by bits 0-2 of the ExtendedFlags1 . A Subscriber can skip NetworkMessages from Publishers it does not expect NetworkMessages from. PublisherIds are only equal if they have the same
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.2.4.6.2 Discovery scope for Datagram transport protocols

Discovery scope for Datagram transport protocols Discovery in a global scope requires unique PublisherIds . Publishers shall use the default PublisherIds as defined in 6.2.7.1 for the following discovery messages
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.2.4.6.7 Status

used exclusively by a single application and the Message Oriented Middleware can detect when Publishers go offline. In these cases, the Publisher sends updates only when its state changes
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.2.4.6.12.2 Traffic reduction

configuration information for PublisherId and DataSetWriterIds of interest. If a Subscriber requires information from Publishers after a startup or version change detection, discovery probes shall be randomly delayed
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.2.5.5.5 Status

used exclusively by a single application and the Message Oriented Middleware can detect when Publishers go offline. In these cases, the Publisher sends updates only when its state changes
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.3.4.1 General

often used with a Broker that relays messages between applications that cannot communicate directly. Publishers send MQTT messages to MQTT brokers. Subscribers subscribe to MQTT brokers for messages. A Broker ... configured in advance with knowledge of the expected encoding. As a consequence, Publishers should only publish NetworkMessages using a single encoding to a unique MQTT topic name. MQTT version
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.3.4.4 Connection properties

UInteger value is converted to a String for the ClientID. MQTT version 5.0 allows Publishers and Subscribers to provide MQTT connection properties as part of opening the connection. The connection
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.3.4.7.1 General

pattern. This clause defines the Topic conventions for use with the MQTT mapping. All Publishers shall be able to support these conventions. A Topic has the following general pattern ... multiple Topic levels. Note that using multiple Topic levels prevents Subscribers from automatically discovering Publishers in the system unless they are preconfigured with the <Prefix> used
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.3.4.8 Message header

start-up and clear all topics that do not match the current Publisher configuration. Publishers using MQTT version 3.1.1 shall clear RETAIN topics when they shut down. Publishers using MQTT
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

7.3.4.9.1 JSON message mapping

application/json+gzip. If a Subscriber receives messages without MQTT ContentType from MQTT Version 3.1.1 Publishers it may require manual configuration
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

8.1 Overview

network service used to manage keys for all Publishers and Subscribers or it can be part of a Publisher to manage the keys for the NetworkMessages sent by this Publisher
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

8.3.2 GetSecurityKeys Method

removed or keys for a SecurityGroup are revoked. However, Subscribers shall be prepared for Publishers using invalid keys until they have called the GetSecurityKeys Method . Publishers using a central ... TimeToNextKey and KeyLifetime are used to calculate the time the Subscriber expects that the Publishers use the next key. Due to network latency, out of order delivery
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

8.3.3 GetSecurityGroup Method

access permissions for the keys. The SecurityGroupId is the identifier for the SecurityGroup in Publishers , Subscribers and the key Server . This Method returns the NodeId of the corresponding SecurityGroup Object
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

9.1.2 Configuration behaviours

Configuration behaviours Publishers and Subscribers may be configurable through vendor-specific engineering tools or with the PubSubConfiguration Object and parameters described in this document. This allows a standard
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

9.1.3.3 SetSecurityKeys

TimeToNextKey and KeyLifetime are used to calculate the time the Subscriber expects that the Publishers use the next key. Due to network latency, out of order delivery ... keys for several Publishers , a Subscriber needs to expect some overlap time where NetworkMessages are received that are using the previous or the next key. KeyLifetime The lifetime
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

B.3.1 General

often used with a Broker that relays messages between applications that cannot communicate directly. Publishers send AMQP messages to AMQP endpoints. Subscribers listen to AMQP endpoints for incoming messages
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

C.3 Publish-Subscribe

Subscribe With PubSub , OPC UA Applications do not directly exchange requests and responses. Instead, Publishers send messages to a Message Oriented Middleware , without knowledge of what, if any, Subscribers there ... types of data, and process messages that contain this data, without knowledge of what Publishers there are. Figure C.2 illustrates that Publishers and Subscribers only interact with the Message Oriented
OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub

C.4 Synergy of models

Above all, the PubSub Information Model for configuration (see 9 ) promotes the configuration of Publishers and Subscribers using the OPC UA Client Server model. Nevertheless, the PubSub communication does ... require such a role dependency. In other words, OPC UA Clients can be Publishers and OPC UA Servers can be Subscribers . In fact, there is no necessity for Publishers
OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model

5.1 Overview

provides the concepts for standard communication between Servers and Clients as well as Publishers and Subscribers , but additional concepts are required for OPC UA FX. These concepts include Connection establishment
OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model

5.5.6.2.5 DataSetMetaData

ConfigurationVersion of an individual Publisher or a GroupVersion combining the ConfigurationVersions of all Publishers belonging to a WriterGroup is transmitted with the NetworkMessage . Any mismatch between the transmitted version
OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model

E.1.3.3 Multiple logical connections - multiple AutomationComponents

shown in Figure E.5 , which shares the same set of parameters for the unicast Publishers and Subscribers . Figure E.5 - Multiple logical connections using multicast (variant
OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model

E.5 Interaction with an SKS

which could mean that the SKS configuration completes before all of the Subscribers and Publishers are configured (each configuration is processed in a separate thread). Figure E.24 - Updating ... have been configured by the ConnectionManager and current keys have been distributed to Publishers and Subscribers . For the push model, the SKS continues to retry pushing keys using SetSecurityKeys
OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model

F.1.6 CommunicationFlowConfigurationConfDataType

DataType Description 4:PubSubConnectionAddress NetworkAddressDataType Allows the configuration of the PubSubConnection Address for Publishers of a unidirectional connection without heartbeat or other cases where the Address configuration in the flow