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Exercises

72 PLC programming exercises, beginner to expert. Solve in your browser, graded by automated tests. The first 8 are free.

#TitleDifficultyStatusSummary

1Lamp FollowDifficultyeasyTurns on a lamp while a push button is pressed and off when released.
2Lamp InvertedDifficultyeasyControls a lamp to be the logical inverse of a push button.
3Two-Button LampDifficultyeasyTurns on a lamp only when both push buttons are pressed simultaneously.
4Either-Button LampDifficultyeasyTurns on a lamp when either of two push buttons is pressed.
5Xor GateDifficultyeasyTurns on a lamp when exactly one of two push buttons is pressed.
6Voting LampDifficultyeasy2-of-3 majority voting for a lamp output.
7Select BetweenDifficultyeasySelects and routes one of two REAL inputs to the output based on a boolean selector switch.
8Start/Stop MotorDifficultyeasyStart/Stop motor controller with seal-in latch and stop priority.
The first 8 exercises are free — Plus plan unlocks the full catalog
9Rising EdgeDifficultyeasyProduces a single-scan pulse on the rising edge of the input.
10Falling EdgeDifficultyeasyProduces a single-scan pulse on every 1-to-0 transition of a BOOL input.
11Count UpDifficultyeasyUp-counter that fires a done signal when count reaches 10.
12Magazine CounterDifficultymediumTracks parts in a feeder magazine: reload fills the count, then each dispense edge counts down to zero.
13Count Up DownDifficultyeasyBidirectional counter tracking a running balance.
14Batch CounterDifficultyeasyPulses BatchReady every 5 trigger events and tracks the running batch count.
15On DelayDifficultyeasyDrives the output high once the input has stayed high continuously for 1 second.
16Off DelayDifficultyeasyKeeps the output high for 2 seconds after the input goes low (Off-Delay).
17Cumulative TimerDifficultyeasyTurns Out_Done on after In_Enable has been on for 5 seconds in total. Pauses retain the elapsed time.
18Sign CheckDifficultyeasyEvaluates a numeric input and sets a flag indicating if it is negative, zero, or positive.
19Compare PairDifficultyeasyCompares two numeric inputs and outputs Less, Equal, and Greater flags.
20ScaleDifficultyeasyScales a raw 4-20 mA sensor signal to a 0-100 °C engineering unit value.
21Absolute ValueDifficultyeasyOutputs the absolute value of a numeric input.
22Reverse Speed ReferenceDifficultyeasyPasses a signed speed reference through, or flips its sign when the reverse command is on.
23ModuloDifficultyeasyOutputs the remainder of dividing the dividend by the divisor.
24Square RootDifficultyeasyOutputs the square root of a REAL input's magnitude.
25ClampDifficultyeasyConstrains a numeric value between 0 and 100.
26Mux 4DifficultyeasyRoutes one of four input sources to the output based on a select value.
27Demux 4DifficultyeasyRoutes a single input to one of four outputs based on a selector value, acting as the inverse of a multiplexer.
28Word InvertDifficultyeasyOutputs the bitwise complement of an integer input — every bit flipped.
29Bit DifferenceDifficultyeasyOutputs a word whose bits are set only where the command and feedback words disagree.
30Bit PackDifficultyeasyPacks eight BOOL inputs into the low eight bits of one DINT word.
31Bit UnpackDifficultyeasyUnpacks the low eight bits of a DINT word into eight BOOL outputs.
32Apply Bit MaskDifficultyeasyPasses only the input bits selected by a mask; every unselected output bit is zero.
33Set Selected BitsDifficultyeasyForces selected bits of a word on while preserving every other input bit.
34One-Scan DelayDifficultymediumDrives one output that follows the button instantly and another that follows it one scan later.
35Press-Toggle LampDifficultymediumToggles a lamp output on each rising edge of a push button.
36Count Up Down with BoundsDifficultymediumBidirectional counter with upper and lower bounds, and flag outputs when the limits are hit.
37PulseDifficultymediumProduces a 1-second output pulse on each rising edge of the trigger input.
38Long PressDifficultymediumFires a single-scan pulse when the input is released after being held continuously for at least 2 seconds.
39DebounceDifficultymediumFilters contact bounce by ignoring input transitions shorter than a preset time.
40FlasherDifficultymediumFlashes an output at 1 Hz (1s ON, 1s OFF) while enabled.
41Watchdog AlarmDifficultymediumRaises an alarm if a heartbeat rising edge is not detected within the timeout period.
42Run HoursDifficultymediumTotals a machine's run time as hours, minutes, and seconds, retaining the total through stops, with a manual reset.
43Delayed ShutdownDifficultymediumHolds the run output high for a cooldown period after a stop command is received.
44Configurable ScalingDifficultymediumLinearly scales a raw input to engineering units between two configurable endpoints.
45Clamp with OverflowDifficultymediumConstrains a numeric input between Min and Max bounds and raises flags when limits are hit.
46VFD Speed RefDifficultymediumClamps an operator percent setpoint to 0-100 and scales it for a VFD configured to accept a 0-32767 raw speed reference.
47DP FlowDifficultymediumConverts a differential-pressure reading into a flow rate using a square-root characteristic.
48HysteresisDifficultymediumApplies hysteresis to an analog input, setting the output true at the high limit and false at the low limit.
49Tank FillDifficultymediumBang-bang controller for a tank fill valve with configurable deadband.
50Level AlarmDifficultymediumGenerates high and low alarms based on a level input, configurable setpoints, and a deadband to prevent chatter.
51Min Max TrackerDifficultymediumTracks the minimum and maximum of an analog input and re-seeds both outputs while In_Reset is asserted.
52Median 3DifficultymediumOutputs the middle of three transmitter readings, excluding the highest and lowest values.
53Lag FilterDifficultymediumSmooths a noisy analog input by closing a fraction of the gap to it once per second.
54Rate of ChangeDifficultymediumReports how much an analog input changed over the last second, updating once per second.
55Mux 4 with FallbackDifficultymedium4-channel multiplexer with an out-of-range selector fallback and fault indication.
56Stateful Masked MoveDifficultymediumCopies selected source bits into a retained word while preserving its previous unselected bits.
57Combine Two RegistersDifficultymediumCombines two 16-bit device registers into one 32-bit word.
58Priority EncoderDifficultymediumEncodes eight BOOL inputs into the index of the highest-priority active input.
59Single-Trigger SequencerDifficultymediumAdvances through three steps using one shared Next button.
60Conditional SequencerDifficultymediumAdvances each step only when that step's own completion input is on.
61Traffic Light SimpleDifficultymediumSimple traffic light sequencer cycling through Red, Green, and Amber phases.
62Manual/Auto MotorDifficultymediumControls one motor in manual or automatic mode with stop priority and a resettable fault latch.
63Replace Selected BitsDifficultymediumReplaces selected bits in an existing word while preserving every unselected bit.
64Bit ToggleDifficultymediumFlips the masked bits of a retained word on each rising edge of the toggle command.
65Mode ManagerDifficultymediumSelects Manual, SemiAuto, or Auto mode and overrides every mode with a resettable fault state.
66Incrementing WatchdogDifficultymediumRaises an alarm when an incrementing heartbeat value stops changing for the configured timeout.
67Traffic Light 2-WayDifficultymediumCycles a two-direction intersection with an all-red safety phase before traffic changes direction.
68Boiler InterlocksDifficultymediumCombines pressure, level, and flame inputs into a burner permissive and reports which condition is blocking.
69Drift-Resistant FlasherDifficultyhardKeeps one-second ON and OFF phases aligned without accumulating scan-cycle delays.
70Pedestrian CrossingDifficultyhardAdds a queued pedestrian request and walk phase to a two-direction traffic light.
71Wash CycleDifficultyhardRuns Fill, Mix, and Drain actuators in order with pause, resume, and reset controls.
72Burner ControlDifficultyhardBurner control state machine through Purge, Ignite, Run, and Lockout states with safety inputs.

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