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8 result(s) for Topics

• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.3.8 Topics
  Topics A Topic is a string associated with a NetworkMessage that can be used to logically organize NetworkMessages published to a Message Oriented Middleware . Topics are most commonly used with ... Broker -based middleware where the filtering is done by the Broker . However, Topics can be used with Broker -less middleware where the filtering is done by the Subscriber . Topics have
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.3.4.7.1 General
  General MQTT messages are sent to Topics which provide context and other information about the message. Topics are hierarchical paths that allow Subscribers to use wildcards to select multiple Topics ... Therefore, Topics are most useful when they follow a predictable pattern. This clause defines the Topic conventions for use with the MQTT mapping. All Publishers shall be able to support
• OPC-10000-17 – OPC Unified Architecture - Part 17: Alias Names
  6.3.1 Definition
  would apply the AliasNameSearchPattern to all AliasNames that are defined under TagVariables , Topics and any other AliasNameCategoryType instance in the hierarchy. Well-known AliasNameCategories are defined in this document. Other
• OPC-10000-17 – OPC Unified Architecture - Part 17: Alias Names
  9.4 Topics
  Topics Topics is an instance of AliasNameCategoryType . Topics shall restrict instances of AliasNameType to only have AliasFor References that point to PublishedDataSetType (or subtypes) instances (PublishedDataSetType is defined ... Topics Node instance is formally defined in Table 24 . Table 24 - Topics definition Attribute Value BrowseName Topics References NodeClass BrowseName DataType TypeDefinition OrganizedBy by the Aliases defined in 9.2 HasTypeDefinition
• OPC-10000-17 – OPC Unified Architecture - Part 17: Alias Names
  A.2 AliasNames used within a single Server
  grouping the well information. The example illustrates AliasNames that are both TagVariables and Topics
• OPC-10000-17 – OPC Unified Architecture - Part 17: Alias Names
  A.5 Client use of an AliasName Server
  Client use of an AliasName Server AliasNames allow a Client to find TagVariables or Topics easily. Many industrial systems assign tags to specific measurement or sensors. These tags follow established
• OPC-10000-17 – OPC Unified Architecture - Part 17: Alias Names
  B.2 GDS
  required is the availability of all AliasNames in the mandatory TagVariables folder and Topics folder, but a GDS could also choose to replicate or even merge the additional AliasNameCategoryType instances
• OPC-10000-17 – OPC Unified Architecture - Part 17: Alias Names
  C.2 Register a Server
  well-known AliasNameCategoryType Objects defined in 9.3 (i.e. TagVariables or Topics ). The organization of the actual structure of the AliasNameCategoryType hierarchy is specific to the GDS vendor and/or the configuration