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

Virtual educational simulator

Change the field input to preview physical state outside the PLC image. Toolkit or Pro Toolkit unlocks the permissive plus Run and Step.

Field inputSimulated physical sensorPermissiveLogic must also be true

Scan execution (ms)Task period (ms)Input pulse (ms)

Task load: 80.0%

Headroom: 2.0 ms

Pulse: May be missed between input samples

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

Change one representative condition and watch the visible preview state respond.

Paid operation

All conditions, Run, pause, Step, fault injection, and complete state transitions require paid access.

Unlocks with Toolkit or Pro Toolkit

Run and Step controls
Every fault and configuration input
Complete state transitions

Toolkit $5/mo · Pro Toolkit $15/mo

Toolkit unlocks advanced tool operation. Pro Toolkit adds the troubleshooting knowledge base, field-document builders, and included library downloads.

Compare plans and unlock

Your plan applies across the site. Work saved on this device is not synchronized to other devices.

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.