Case study: Lighting SCADA — monitoring, control and leakage-current alarm on one web screen

Built exactly from your drawing: main MCCB → 2 lighting lines → every pole, with true status feedback and real-time alarms.

The problem: lighting operations are still "blind" and reactive

A lighting system — whether street lighting, a yard, or a factory floor — is usually run the old way: to switch it on or off, someone walks to the electrical cabinet and flips a breaker or contactor; to know the voltage or load current, someone measures on site; and most dangerously, a leakage-current fault is often only discovered after someone gets a shock or equipment is already damaged. Across many lines and many poles, this approach wastes labor on travel, reacts slowly, compromises safety — and leaves behind no data for reconciliation or reporting.

The customer handed us a single-line diagram: utility power coming in through one 3-phase main MCCB, split into two lighting lines (Line 1 and Line 2), each switched by a contactor. The requirement: digitize this entire diagram into one monitoring & control screen, viewable remotely, with an immediate alarm whenever leakage current occurs.

The solution we built: true to the drawing, running on the web

We recreated the entire load diagram on a web SCADA (FUXA PRO) running directly on the iNut Datalogger, combining three real signal sources:

• A PM1125H multifunction power meter measuring the incoming supply: per-phase voltage (V-L1N/L2N/L3N), per-phase current (A1/A2/A3), and total power in kW. This is the "health meter" of the whole system.
• A LOGO! PLC controlling both lines: output Q1 for Line 1, Q2 for Line 2, with MAN/AUTO modes. On screen, the ON/OFF buttons of each line write the M10/M11 control flags down to the PLC.
• Feedback signals I4/I5 (FB1/FB2) reading back the actual state of each contactor — not just "command sent" but "did it really close/open?". This is the subtle part: button colors on screen follow the real Q1/Q2 state, so the operator knows at a glance.

Watching over everything is an I3 leakage-current sensor: when leakage is detected, the "LEAKAGE CURRENT ALARM" lamp on screen turns red in real time. Everything is displayed as a load diagram matching the customer's drawing — the 3-phase L1/L2/L3 busbar, branches down to every lighting pole on both lines — plus Mainview / Mobile / Timer / History buttons.

Why this beats the old way of operating

• One screen, anywhere. Thanks to a secure P2P connection, the person in charge monitors and controls from the office or right on their phone (Mobile view) — no trip to the cabinet needed.
• Verified control. The I4/I5 feedback answers the eternal question: "I pressed OFF — but did it actually turn off?". No more assuming a line is dead while it is still energized.
• Proactive safety. The I3 leakage sensor alarms immediately — you don't wait for an accident to find out.
• Built from your exact drawing with FUXA PRO — and this screen programming is something iNut does for you, free of charge. No need to hire a SCADA programming team.
• Endlessly extensible with JavaScript scripts. Still inside FUXA, you can add: scheduled on/off (Timer), a history log of switching events and alarms (History) for traceability & reporting, or API calls that push alerts via Zalo/Telegram/email. These scripts are written very quickly with help from AI (ChatGPT, Claude, Gemini).
• Your data stays yours. Every voltage, current, status and leakage event is stored on site — the foundation for load analysis and operational optimization later on.

The value delivered

Instead of sending people to inspect each cabinet, the operations team manages everything centrally on one screen: they know the supply status, switch each line proactively, and react instantly to leakage current. Just as importantly, the system starts accumulating historical data — something manual breaker-flipping never produces — for reporting, energy reconciliation and future improvements.

How to replicate it