PLC Simulator
For electricians and maintenance techs

PLC Training for Electricians

If you can read a motor control schematic, you already understand most of ladder logic. Start from the circuits you wire every day, learn what is new, and practice on simulated machines in your browser. No PLC to buy, no software to install.

What you already know

Relay and motor-control circuits, translated to ladder

Ladder logic was built to look like relay schematics. Most of what you learned on the job maps straight across.

Electrical control components and their ladder logic equivalents
On a control schematicIn ladder logic (Allen-Bradley names)What to know
Contactor or relay coilOutput coil (OTE)The PLC turns the output on; the output then drives the real coil through an interposing relay or output card.
Normally open contactXIC (examine if closed)True when the input or bit is ON.
Normally closed contactXIO (examine if open)True when the input or bit is OFF.
Stop button (NC, wired to an input)XIC on that inputThis trips people up. A healthy NC stop button holds the input ON, so the rung examines it with XIC. Pressing stop, or a broken wire, drops the input and stops the motor.
Auxiliary seal-in contactParallel branch around StartThe same three-wire circuit, drawn as a rung that holds itself in.
Timing relayTON / TOF timerOn-delay and off-delay, with done bits you can use anywhere in the program.
Mechanical interlock contactXIO of the other outputForward and reverse lock each other out in logic as well as in the wiring.
Overload contactAn input in series with the run logicThe overload still protects the motor in hardware; the PLC also sees it and can show an alarm.

What is new

Four things electricians have to learn

The scan cycle

A PLC reads all inputs, solves the rungs top to bottom, then writes all outputs, over and over. Relays all act at once; a PLC acts in order. That is why rung order matters.

Addresses and tags

Every input, output, timer and internal bit has a name or address, like I:0/0 or Start_PB. Reading a program means following those names, not wires.

Sinking and sourcing I/O

DC sensors and input cards must match: a PNP (sourcing) sensor needs a sinking input. Get it wrong and the input never turns on.

Faults that live in software

A motor that will not start can be a broken wire, a blown fuse, or a rung that is false for a reason you can only see online. You learn to check both sides.

The plan

A 4-week evening plan

Three or four evenings a week is enough. Each week ends with something you can show: a working rung, a wired circuit, a fault you found.

  1. Week 1

    Ladder logic is a control schematic

    • Lessons 1–6: output coil, NC E-stop, series and parallel contacts, the seal-in, and latch/unlatch.
    • Build the Motor Start/Stop scenario and compare it to the three-wire circuit you already wire.

    Plan: Free

  2. Week 2

    Motor control in logic

    • Forward/reverse with interlocks and star-delta starting in the motor control PLC scenarios.
    • Lessons 7–12: one-shots, TON and TOF timers, counters and a capstone.

    Plan: Basic or Pro

  3. Week 3

    Wiring the field side

    Plan: Free starter labs; all labs with Pro

  4. Week 4

    Troubleshooting both sides

    Plan: Free starter faults; scored practice with Pro

Work in the Allen-Bradley dialect if your plant runs Rockwell equipment. The Allen-Bradley PLC training page lists every lesson. Prefer to try first? The Allen-Bradley PLC simulator opens in your browser.

Honest limits

What this training is not

  • It does not give state CEUs or credit toward an electrical license. Check your state board for approved CE providers.
  • It is not a manufacturer course and does not give Rockwell or Siemens certification.
  • It does not replace supervised work on live equipment, lockout/tagout or your site's safety procedures.

What it does give you: hands-on practice with the logic and the fault-finding method, graded on simulated machines, at your own pace. Pro adds a certificate of completion with a public verification page for your resume.

Facing a maintenance skills test?

Many plants test electricians before they hire. Our Ramsay-style practice questions cover the electrical, motor-control and PLC topics, with answers explained. For broader PLC questions, try the PLC practice test.

Questions

PLC training for electricians: common questions.

Yes, and electricians usually learn it faster than people without a trade background. Ladder logic was designed to look like relay control schematics, so contacts, coils, seal-ins, timers and interlocks are ideas you already use. The new parts are the scan cycle, addresses and the programming software.

Start with the circuit you already know.

Build a three-wire start/stop rung in your browser in a few minutes. Free, no card.