Glossary term
OPC UA
protocoleIntermediate
Also known as
OPC Unified ArchitectureIEC 62541
Definition
Unified communication architecture defined by the OPC Foundation (IEC 62541), service-oriented and platform-independent. Replaces OPC Classic (DCOM). Exposes a structured address space (nodes, references) accessible via session or Pub/Sub.
Questions using this term
- OPC UA is codified by the IEC 62541 standard, divided into several parts (Part 1 Overview, Part 3 Address Space, Part 4 Services, Part 5 Information Model, Part 6 Mappings, Part 7 Profiles, etc.), and maintained jointly by the OPC Foundation and the IEC TC65 committee.14. Standards · IEC 62541
- The Niagara Framework (Tridium / Honeywell) is a multi-protocol software platform widely used in modern tertiary BMS, natively integrating BACnet (IP, MS/TP, SC), Modbus, KNX, OPC UA and others.9. Integration · Niagara Framework
- Niagara Workbench (Tridium/Honeywell) is a Java-based engineering tool that supports visual programming (wire sheet), BACnet configuration and deployment to JACE controllers for multi-protocol BMS projects.23. Engineering · Niagara Workbench
- The typical Modbus 'hub and spoke' architecture has a central master PLC periodically polling N RTU/TCP slaves and aggregating the data, which it then forwards to the BMS over a different protocol (BACnet, OPC UA, MQTT), enabling scaling without loading the BMS directly.22. Architecture · Hub-and-Spoke
- OPC UA supports two communication patterns: Client/Server (the classic Request/Response model) and Pub/Sub (publish/subscribe over MQTT or UDP multicast/unicast), the latter introduced in version 1.04 to address Industrie 4.0 use cases.1. Architecture · Client/Server vs. Pub/Sub
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