A structured PLC programming course with 12 core lessons, 170 source-catalogued practice records, and real ladder logic exercises. No install, no credit card, no trial clock.
The first exercise in the course — you write the logic, we run the machine.
Overview
What this PLC programming course covers.
A PLC programming course should teach you to read and write the logic that runs industrial controllers: ladder diagrams, Structured Text, and the function blocks defined in IEC 61131-3. It should also make you dangerous with the two brand dialects you will encounter on most plant floors — Allen-Bradley and Siemens.
This course covers exactly that, in a specific sequence. You start with the scan cycle and contacts-and-coils (Module 1), move to timers, counters, comparisons, and Structured Text (Module 2), then work through structured design patterns like state machines and SFC (Module 3). From there you run hands-on machine scenarios — motor starters, conveyor sorters, batch mixers, PID loops (Module 4) — before finishing with debugging methodology, alarms, safety systems, and code organisation (Modules 5 and 6).
What makes this different from most PLC programming classes is the exercise model. Every scenario ships with a test harness: hidden test cases that run your actual ladder logic against a simulated machine and return a pass/fail. You get the same feedback loop a hardware lab gives you — without the hardware budget or the lab booking system.
Lesson 1 of the course maps the hardware you are programming: CPU, I/O modules, and field wiring.The scan cycle is the single mental model your whole program runs on — read inputs, solve logic, write outputs, repeat.
At a glance
Everything included in the course.
12 core lessons
Written with diagrams — faster to work through than video.
170
Source-catalogued practice records; visible access varies by plan and rollout.
12 quizzes
Multiple-choice with hidden marking — no answer-peeking.
9 dialects
IEC 61131-3 and vendor-style learning tracks; not full firmware emulation.
40–80 hours
Estimated total to reach interview-ready confidence. [ESTIMATE]
Free to start
32 source-tagged records after signup; one guided program at /try.
Curriculum you can see
Progress from first I/O to verified machine control
Each course stage adds a specific capability and an observable test. The goal is not to collect lesson views; it is to build, diagnose and prove increasingly realistic PLC behavior.
01The course moves from observable I/O behavior to reusable control patterns, fault reasoning and an assessment that produces evidence—not just lesson completion.
02The first learning loop is deliberately small: predict the state, run both input cases and prove that the output follows the program.
03Timers and counters become understandable when their internal state is aligned with sensor pulses and visible machine events.
04Reusable patterns are taught in context: permissives decide whether a start is allowed, seal-in logic remembers run state and alarm latches preserve important faults.
05Debugging starts from a failed requirement. The I/O table and ladder identify the address mismatch; the same test then proves the correction.
06A credible assessment asks the learner to interpret requirements, build the control, run hidden cases and preserve evidence for each required behavior.
Course curriculum
Six modules, structured from first principles.
Work through the modules in order. Each one builds on the last. Resist the urge to jump to the advanced scenarios — the sequencer muscle you build in Module 1 is what makes Module 4 tractable.
A finished rung — contacts on the left decide whether power flows to the coil on the right. This is what you will be writing by the end of Module 1.
Module 1 — Foundations
The four lessons every PLC programmer must own before writing a single rung. Estimated: 4–8 hours.
The three symbols Module 1 starts with — every rung you write is built from contacts and coils.The seal-in rung — the motor start/stop pattern behind your first hands-on exercise.
Module 2 — Logic Building Blocks
Comparisons, math, analog I/O, and Structured Text. Estimated: 4–8 hours.
Module 2 covers analog scaling — turning raw 4–20 mA counts into real engineering units.Structured Text — the IEC 61131-3 textual language you learn alongside ladder in Module 2.
Module 3 — Structured Design Patterns
State machines, SFC, and shift-register sequencing. Estimated: 4–8 hours.
The full scenario library contains 170 source-catalogued practice records across motor control, water/HVAC, packaging, safety, and process verticals. Visible availability varies by account, plan, entitlement, and staged rollout.
The first scenario you grade — your ladder logic drives this exact motor circuit in the browser simulator.
Module 5 — Troubleshooting & Debugging
The lessons most courses skip. Being able to read and fix someone else’s ladder logic is what plants actually pay for. Estimated: 4–6 hours.
This course is designed for anyone who needs to program PLCs but does not have consistent access to hardware or a structured learning path. Four groups find it particularly useful.
Complete beginners
No programming background needed. The course starts with what a PLC actually is and builds from first principles. You write real ladder logic by lesson two.
Engineering students
Preparing for an internship or controls-engineering interview? The scenario library gives you the practice reps your university lab session could not — without booking lab time.
Maintenance technicians
You already understand the machines. This course bridges the gap from reading ladder logic to writing it — and from recognizing a fault to isolating it in code.
Adjacent-field engineers
Mechanical, electrical, or software engineers moving into automation. The scan-cycle model is unlike web or embedded development; the course explains the mental shift explicitly.
Honest comparison
What makes this different from other PLC programming courses?
Most PLC programming classes are video-based. Udemy courses range from $20 to $100 and cover theory well, but you watch a completed rung rather than writing one. If you pause and try to replicate it, you are on your own with no feedback. YouTube tutorials are free but fragmented — there is no guaranteed sequence, no grading, and no way to know when you are ready for the next concept.
Paid platforms like RealPars (approximately $600/year) and PLCacademy (approximately $500 for a full course) are solid and genuinely structured. They are still video-based, and neither ships a browser-based simulator with auto-graded test cases. Classroom training from Allen-Bradley or Siemens partners typically starts at $2,000 per week and requires you to be in a specific city on a specific date.
This course is written, not filmed. Reading a lesson is faster than watching it when you already understand the mechanical context. Every scenario has a test harness: your code either makes the machine behave correctly or it does not, and you get specific feedback about which test case failed. That tight loop — write, run, fail, fix, pass — is the mechanism that builds genuine PLC programming competence faster than passive watching. It is also free to start, with no artificial trial deadline pushing you to rush.
“A course that cannot fail you cannot teach you. Every scenario here is graded against scripted test cases precisely because ‘watched all the videos’ and ‘can write a working interlock’ are different skills — employers only pay for the second.”
Whichever course you choose, learn the IEC 61131-3 languages first. The five standard languages — Ladder Diagram, Function Block Diagram, Structured Text, Instruction List, and Sequential Function Chart — are vendor-neutral, so the concepts transfer directly from this simulator to Allen-Bradley Studio 5000, Siemens TIA Portal, CODESYS, or any other platform you meet on the job. You can also dive straight into the learn PLC programming hub if you prefer to follow individual topics rather than the full course track.
The five IEC 61131-3 languages this course is built around — learn these and the skills transfer to any PLC brand.
Option
Cost
Hands-on exercises
Auto-graded
This course
Free (Pro optional)
170 source-catalogued practice records
Yes
Udemy video courses
$20–100
None
No
YouTube tutorials
Free
None
No
RealPars / PLCacademy
~$600/yr (RealPars) / varies (PLCacademy)
Limited
No
Classroom training
$2,000+/week
Lab time only
No
Time commitment
How long does the PLC programming course take?
The short answer: 40–80 hours end to end — roughly 8–16 hours for the fundamentals, 20–40 hours once the machine scenarios are included, and the balance on troubleshooting, safety, and the interview tracks. Evening learners typically finish in six to eight weeks. Set against O*NET’s 2025 median wage of $64,520 for industrial machinery mechanics, the roles this skill most often upgrades, it is a small investment.
Modules 1 and 2 — fundamentals through logic building blocks — take roughly 8–16 hours of focused practice for most learners. By the end you will have written working ladder rungs for timers, counters, seal-in circuits, and Structured Text conditionals. That is the point where you can read someone else’s ladder logic without constantly looking up notation.
Adding the machine scenarios in Modules 3 and 4 brings the total to 20–40 hours. A conveyor sorter, a batch mixer, and a PID temperature loop will each take you two to four hours the first time — longer than they look, because the test harness is precise and your first attempt will miss edge cases you did not think about. That is the point. Missing them in a simulator is free; missing them on a live production line is not.
Completing all six modules and working through the interview prep tracks is a 40–80 hour commitment. Most people doing this in the evenings — one to two hours per night — finish the foundational modules in three to four weeks and reach interview-ready confidence in six to eight weeks. That is a realistic timeline for an entry-level controls-engineering role, not a career change number. [ESTIMATE — based on typical learner progression; individual results vary.]
Yes. A free account includes the first 6 core lessons per dialect and 32 source-tagged free-tier practice records. The /try path guides you through one first program without an account. There is no trial clock and no credit card required to start.
Open Module 1 now.
The PLC Fundamentals lesson takes about 20 minutes to read. The Motor Start/Stop scenario takes about 45 minutes to pass on your first attempt. Both are free.
Watch the real browser product respond to the task on this page, then try the same practical workflow yourself. No slides, concept mockups, install, or credit card.
