Simulator

PLC Scan Cycle Simulator

Run or step through a simplified cyclic PLC model to see when physical inputs enter the input image, logic changes the output image, and outputs reach field devices.

Inputs and controls

This fixed worked example shows the complete scan-cycle layout and current state. Toolkit or Pro Toolkit unlocks the inputs plus Run and Step.

Field inputSimulated physical sensorPermissiveLogic must also be true

Scan cycle 1

Teaching pace: one visible phase every 900 ms.

Next: Read inputs

Phase 1

Read inputs

Phase 2

Execute logic

Phase 3

Write outputs

Phase 4

Housekeeping

Field inputOFF

Input imageOFF

Output imageOFF

Field outputOFF

Last completed action

Ready to sample the field input.

Logic: OutputImage := InputImage AND Permissive

Requires Toolkit or Pro Toolkit

Interactive controls simulators

Free preview

Inspect fixed simulator conditions and the real output state for the worked example.

Paid operation

Editable conditions, Run, pause, Step, fault injection, and changing state transitions require paid access.

Unlocks with Toolkit or Pro Toolkit

Run and Step controls
Editable faults and inputs
Changing signal and state results

View account options

Entitlement store: unavailable. No saved presets, saved settings, or customer tool history are stored in V1.

Model boundary

The visible delay is intentionally slowed for teaching. Real controllers vary by platform, task type, scheduling, I/O update model, communications, instructions, and program load.