Exercises
Open any exercise to edit its ladder program, run it against the device, and pass the automatic tests. All exercises are free and need no account.
Lamp Follow
A single push button controls a lamp. Press the button and the lamp lights; release it and the lamp goes out.
Two-Button AND
Two push buttons must both be pressed before the lamp lights.
Either-Button OR
Pressing either push button lights the lamp.
Motor Start/Stop
Start the motor with the Start button; it keeps running after release. Press Stop to switch it off. Stop has priority over Start.
Delayed Start
Press Start; the motor starts only after the timer reaches its preset (1000 ms). Releasing Start before then resets the timer.
Batch Counter
Count product pulses. When the count reaches 5, the Batch Complete output turns on. Reset clears the count.
Traffic Light
Start the cycle: Red (3 s) → Green (2 s) → Yellow (1 s) → Red, repeating while running. Stop aborts to a safe state. Red and Green must never be on together.
Tank Level Control
The pump fills the tank. Start pumping when the low sensor reports LevelLow; stop when the high sensor reports LevelHigh. Between the two thresholds, keep the pump in its current state.