How To Program A PLC From Zero (No Hardware Needed)
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Want to learn how to program a PLC from absolute zero? This video starts with no assumed knowledge. By the end you will understand what a PLC actually is, what ladder logic is, how the scan cycle works, and you will have written your first real PLC program in a free browser-based simulator. No hardware, no installs, just a browser.
Properly understanding the hardware and the scan cycle is the first real step.
A PLC is a programmable logic controller. Strip the jargon: it is a small rugged computer that runs machines. Inputs come from buttons, sensors, and switches. Outputs go to lights, motors, valves. Between the inputs and outputs is a program written by a human that decides what the outputs do. PLCs run this loop twenty to a hundred times per second, every second, for years at a time without rebooting. They are inside every elevator, every conveyor, every traffic light, every machine on a factory floor.
The most common way to program a PLC is in ladder logic — a visual programming language deliberately designed in the 1960s to look like a relay circuit diagram, so electricians could read it without learning a new language. The two vertical lines are power rails. Each horizontal rung is one rule: if the left-side conditions are satisfied, the right-side action happens. Sixty years later it is still the dominant PLC programming language because that design choice still works.
The PLC executes your program in the scan cycle: read all inputs into memory, run the program top to bottom using the snapshot, write outputs back to the real world. Then the cycle repeats. A modern PLC like a Siemens S7-1200 completes a small program scan in one to five milliseconds.
Your first program is the doorbell pattern: a start button, a motor coil, one rung. Press the button, the motor runs. Release, the motor stops. Build it free in the browser at plcsimulationsoftware.com — the latching and sealing-in lesson on the free tier walks you through it. From there, the patterns to learn next are timers, counters, seal-in latching, and emergency stops. A real industrial program is rarely doing anything more complex than these primitives stacked together.
Who this is for: Total beginners learning how to program a PLC; career-changers from related trades (electrical, instrumentation, mechanical); engineering students preparing for their first controls role; anyone curious about how PLCs actually work.
— Chapters —
0:00 Start from absolute zero
0:25 What a PLC physically is
1:10 The 5 hardware components
2:00 Why ladder logic (the relay-replacement story)
2:55 The scan cycle in three phases
3:55 The snapshot rule that catches every beginner
4:35 Where PLCs actually live (industries)
5:25 Your first rung in the browser
6:35 What to learn next (primitives stack)
7:35 Where real hardware fits in
8:10 Subscribe + next video
— Title variants (A/B testing) —
1. How To Program A PLC From Zero (No Hardware Needed)
2. How To Program A PLC In Your Browser — Start Today
3. How To Program A PLC — The Honest Beginner Path
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