PLC logic, made visible.

Monitoring relay and lamp states from TwinCAT ladder logic through a connected web interface.

TwinCAT ADS ASP.NET Core SignalR

TwinCAT PLC
ADS / C#
SignalR
Relay interface

THE CHALLENGE

A practical problem.

Expose PLC states in a web interface and send start/stop commands back to the controller.

MY CONTRIBUTION

What I built.

Implemented ADS variable access in C#, a polling service for PLC states, and SignalR messages for browser updates. Added relay controls and lamp indicators to visualize the ladder logic state.

THE RESULT

From idea to demo.

A bidirectional demonstration: PLC variables update the browser and interface commands toggle PLC variables.

See the project in action.

Watch on YouTube ↗

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