PLC Controller Sim

Build browser ladder logic with timers, counters, sensors, actuators and factory demos, then export simulated logic as JSON or Structured Text.

What this tool does

PLC Controller Sim is a browser-based ladder-logic editor and scan-cycle simulator. Build circuits, load industrial and robotics demo templates, adjust simulated inputs, watch I/O and execution logs, and export the logic representation.

Who this is for

• Students learning PLC scan cycles and ladder concepts
• Controls developers prototyping logic without hardware
• Teams demonstrating timers, counters, sensors, and actuators

How to use this tool

1. Add instruction blocks, wire ports, and edit or delete selected blocks
2. Run or stop the scan cycle, or load one of the built-in factory and robotics demos
3. Move simulated sensors and inspect energized wires, I/O, visual equipment, and the execution log
4. Save or load JSON and export generated logic as IEC 61131-3 Structured Text

Inputs

Inputs include ladder instructions and wiring, simulated sensor values, timers, counters, actuator states, and demo selections. The page does not accept a real PLC connection.

Outputs

The simulator shows ladder state, virtual I/O, energized wires, equipment views, and execution logs. Save downloads JSON, while Structured Text export opens generated simulated logic for review.

Example use cases

• Teach timers, counters, contacts, coils, and scan behavior
• Explore pick-and-place, elevator, motor, sorting, or safety demos
• Draft logic before transferring concepts to a real engineering environment

Frequently asked questions