PLC Training — A Complete Online Curriculum

What a PLC is, the scan cycle, I/O tags and addresses. The mental model everything else builds on.

Contacts, coils, OR/AND rails. How ladder notation maps to relay schematics — and why that matters.

SET/RESET coils, the three-wire seal-in rung, and why non-retentive coils de-energise between scans.

TON, TOF, TP, CTU, CTD — the function blocks that appear in virtually every piece of ladder logic.

How to encode a state variable and transition logic without spaghetti rungs.

Online monitoring, force bits, and the scan-cycle timing bugs that catch every beginner twice.

Instance data, input/output pins, and how to wire standard IEC function blocks into a program.

EQ/GT/LT, ADD/SUB/MUL/DIV instructions and how they interact with the rung power flow.

Raw counts, engineering-unit scaling, and the dead-band tricks that keep analog-driven rungs stable.

Steps, transitions, and divergence. The IEC 61131-3 language that makes batch sequencers readable.

IF/ELSIF/CASE, FOR loops, and how ST sits alongside ladder in the same project.

Part-tracking on conveyors, pallet ID handoff, and bit-array sequencers for packaging lines.

P, I, and D terms explained physically. Tuning a loop from first principles without a simulator crash.

Alarm latching, acknowledge/reset logic, and the common mistake that causes nuisance trips.

Safety PLCs, SIL levels, E-stop circuits, and light curtain wiring — what the standard actually requires.

Coils, discrete inputs, holding registers — the register map mental model and a worked read/write example.

Program tasks, function block libraries, and naming conventions that stop a 500-rung program from becoming unreadable.

Half-split, substitution, and the first-principles approach that works when the IO table is your only instrument.

Four-way signal with timer chain and all-red safety phase. The canonical first scenario.

Three-wire control with seal-in, E-stop, and thermal overload. Every motor control pattern starts here.

Photo-eye sort station with a CTU counter and reject actuator timing.

Level sensors with hysteresis and a latched high-level alarm. First analog-adjacent scenario.

Multi-step sequencer with ingredient timing and agitator interlock. State machine practice.

Multi-floor call queue, door timing, and direction logic. Builds real sequencer discipline.

Purge, ignition, and pressure-proving sequence with fail-safe lockout logic.

Closed-loop control of a heated vessel. Tune the loop by adjusting gains and watching the response.

Layer counting, row indexing, and full-pallet divert — packaging line sequencing at its core.

Indexing conveyor with filler, capper, and reject interlocks. Multiple simultaneous state machines.