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Ladder Logic Exercises

Worked machines you can build yourself: traffic lights, tank fill, car wash, conveyor sorting, pump stations, bottle filling and multi-motor start sequences, each with the ladder and the reasoning behind it.

Reading about a seal-in circuit and building one are different skills. Each exercise here describes a machine, states the sequence in plain words, and then walks through the rungs that make it run. Open the ladder in the browser simulator, toggle the inputs, and watch the logic behave the way a real controller would.

7 articles in this hub

Flat vector diagram showing a three-motor start sequence connected to a PLC output rack with timed interlock arrows and fault latch symbols
motor sequenceladder logicplc exercise

3-Motor Start Sequence PLC Exercise: Ladder Logic

Learn how to write a 3-motor timed start sequence in PLC ladder logic. Full rungs, tag names, fault handling and a worked Rockwell example included.

Jul 25, 2026 路 8 min read

Flat vector diagram of a tank fill control system showing level sensors, inlet valve, transfer pump, and connections to a PLC I/O rack for a ladder logic exercise
ladder logictank fill controlplc exercise

Tank Fill Control PLC Exercise: Ladder Logic

Build a tank fill control program from scratch. This exercise covers level sensor inputs, inlet valve control, pump sequencing, high-level fault latching, and HMI interlock in ladder logic.

Jul 25, 2026 路 7 min read

PLC pump station ladder logic exercise diagram showing two pumps, level switches, duty/standby alternation and fault detection
ladder logicplc exercisepump control

PLC Pump Station Exercise: Ladder Logic

Build a realistic two-pump station in ladder logic: level-based start/stop, duty/standby alternation, run-confirm fault detection, and a hand-off-auto selector.

Jul 15, 2026 路 7 min read

Car wash PLC ladder logic exercise diagram showing sensor inputs, state machine, and output devices
ladder logicplc exercisesequencer

Car Wash PLC Exercise: Full Ladder Logic

A step-by-step PLC ladder logic exercise for an automated car wash: inputs, outputs, sequence states, interlocks, and the timing tricks you need to get it right.

Jul 15, 2026 路 6 min read

Traffic light PLC exercise ladder logic diagram showing four-phase timer sequencer
ladder logictimerssequencer

Traffic Light PLC Exercise: Full Ladder Logic

A traffic light PLC exercise is the perfect timer and sequencer workout. Build the full four-phase cycle in ladder logic, then add a pedestrian call button.

Jul 3, 2026 路 6 min read

PLC elevator logic exercise diagram showing 3-floor shaft wired to a PLC rack with ladder logic rungs
ladder logicsequencerexercise

PLC Elevator Logic Exercise: Step-by-Step

A complete PLC elevator logic exercise covering floor call latching, direction interlocks, door timers and a state-based sequencer. Real runnable ladder included.

Jul 3, 2026 路 7 min read

PLC bottle filling machine project diagram showing conveyor, fill valve, sensors and PLC rack in flat vector style
ladder logicsequencerhands-on project

PLC Bottle Filling Machine: Step-by-Step Project

A hands-on PLC bottle filling machine project covering I/O design, sequence logic, fill-by-time control, and a real ladder rung you can adapt today.

Jul 3, 2026 路 8 min read