PLC Simulator
Feature: Wiring & Fault-Finding Tutor

Wire industrial panels and diagnose faults — in your browser.

An interactive lab with 29 wiring lessons and 19 fault-finding scenarios. You drag wires through realistic panel layouts, route DIN-rail circuits, and use a virtual multimeter to trace physical faults. Five foundation labs are Free; advanced wiring and all fault diagnosis are Pro.

Open the free wiring lab →See every Pro workspace
Browse all 48 wiring and fault lessons
PLC Wiring Simulator — real guided browser lab demo

What you'll build

Three representative lessons across the curriculum. The full track has 29 wiring lessons (power, sensors, motor control, safety, instrumentation and communications) and 19 fault scenarios.

Wiring 1

E-Stop Control Circuit

Route 24 V from a DIN-rail PSU to the PLC base, build the 24 V and 0 V buses, bond PE to the ground bar and wire an E-stop that drops a relay. The free starting lesson.

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Fault 1

Photoeye polarity diagnosis

A photoeye is wired NPN where the PLC card expects PNP. Use the multimeter to find which terminal is reading wrong.

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Wiring 8

Safety circuit with E-stop and contactor

Wire a Category-3 safety circuit: E-stop button → safety relay → contactor. Mistakes here matter.

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How the lab works

  • Drag-route wiring. Click a terminal, drag to another, drop to connect. Wires snap to grid, animate as they're laid down, and update the live circuit graph.
  • Per-connection grading. Submit and the grader checks every connection against the lesson's expected map. Wrong wires highlight red; correct wires green.
  • Virtual multimeter. In fault scenarios, the multimeter reads the real voltage at any terminal. Use it to trace the circuit and isolate the fault.
  • Tier-aware access. Five foundation labs are Free. Advanced wiring and all fault-diagnosis labs show a useful preview, then require Pro for the interactive circuit.
PLC Wiring Simulator — real guided browser lab demo

Who it's for

Maintenance technicians

Sharpen fault-tracing skills you'll use on the floor without taking equipment offline.

Panel builders

Practice DIN-rail layouts, control wiring, and safety-circuit topology before you cut a single wire.

Students & career changers

Build hands-on intuition for industrial wiring without the cost or safety risk of real hardware.

FAQ

Do I need any installs?
No. Everything runs in your browser. Phaser-based canvas — no plugins, no native binaries.
What's free vs paid?
The foundation labs are free to start. The advanced motor-control, instrumentation, safety, communications and fault-diagnosis labs require a Pro account.
How long does each lesson take?
10–25 minutes for wiring lessons depending on complexity. Fault scenarios are typically 5–10 minutes once you know the diagnostic technique.
Do I need real hardware?
No. The lab is self-contained. That said, time on real panels is irreplaceable — this is a complement to hands-on practice, not a substitute.
How is this different from the fault-diagnosis section on the homepage?
The homepage <FaultSection> covers logic-layer faults — bugs in your PLC code found via scan-cycle highlight and cross-reference. This wiring tutor covers physical-layer faults — broken wires, polarity reversals, contact swaps inside a real panel, found by tracing the circuit with a multimeter.

Ready to wire your first panel?

Start with Lesson 1 — free on signup, no install.

Open the free wiring lab →See Pro in action

Competency and practice field guide

PLC wiring tutor: practice plan

Direct answer

The learner can read the circuit brief, connect a complete signal path, predict node state and diagnose a controlled wiring fault using evidence.

Written for electrical and automation learners practicing control power, inputs, outputs, relays, starters, sensors and measurements before supervised physical work.

System map / 02

NODE 01observable

Scope

The circuit purpose, nominal supply, device terminals, commons, protection, load, expected state and safe learning boundary.

NODE 02observable

Signal path

Source and return through field device, PLC channel, logic, output interface and load with named test nodes.

NODE 03observable

Baseline practice

One correctly wired input and output circuit operated repeatedly from an isolated state.

NODE 04observable

Edge cases

PNP and NPN polarity, shared commons, relay isolation, leakage, loss of supply, open return and restart.

NODE 05observable

Fault practice

One wrong terminal, missing common, open conductor, incompatible interface or failed device isolated from expected readings.

NODE 06observable

Transfer to the job

The learner explains the circuit and transfers it only under approved physical-lab supervision.

Product evidence / 05

What the browser practice can actually demonstrate

The feature provides interactive terminals, device behavior, node-aware checks, controlled fault cases and staged feedback in an isolated model. It can retain attempt evidence without exposing the learner to real energy.

Answer surface / 07

Can I learn PLC wiring online?

You can learn circuit interpretation, terminal roles, polarity, commons and expected measurements online. Physical competence still needs supervised tools, equipment and site safety procedures.

Does the wiring tutor simulate live electrical work?

No. It is an isolated learning model and does not authorize or reproduce energized-work hazards.

Continue the signal path / 08