OPC UA Equipment Monitor

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A stale reading must never look live

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Overview

Real-time industrial equipment monitoring in .NET 8, with both links shown separately

An operator is watching a machine on a dashboard and the connection drops. The question that matters is whether the screen carries on showing the last numbers as though they were live.

A .NET 8 service subscribes to node changes on an OPC UA server and streams them over SignalR to an Angular dashboard that charts them as they arrive.

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Engineering

How it was built

Frontend

  • Angular dashboard charting values as they arrive
  • Last-known values held and labelled on link loss, with the age since the last update
  • Address-space tree for choosing which nodes to monitor

Backend & services

  • .NET 8 OPC UA client, nodes resolved by browse path or node id
  • Subscriptions with per-node quality, timestamp and value band
  • SignalR hub streaming updates to every connected dashboard
  • Equipment session state tracked and published separately from the dashboard socket

Testing & verification

  • 81 tests
  • Verified against a live public OPC UA server: session, browse paths and subscriptions

Applied

Skills on this project

.NETC#OPC UASCADASignalRAngularReal-time systems

Next step

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