Free online PLC simulator for ladder logic, HMI and robot practice

About PLC Simulator

If you’re learning PLC programming and don’t have a Windows laptop with Studio 5000 or TIA Portal on it, this is worth a look. You write ladder logic or Structured Text in the browser, press Run, and a 2D or 3D machine scene reacts to your program. Scenarios come with test cases that grade your logic, so you find out whether it actually works, not just whether it compiles. It runs on a Chromebook, Mac or PC with no install or license key, and you can try one program before making an account.

It goes further than plain IEC 61131-3. There are syntax lessons styled after Allen-Bradley, Siemens, Mitsubishi, Omron, KEYENCE, Schneider and Delta, robot languages like ABB RAPID and KUKA KRL, and a drag-and-drop HMI builder with alarms and live trends. The homepage is honest that the brand dialects are teaching subsets, not emulations of real vendor firmware, so it won’t replace testing on actual hardware.

The free plan is properly usable: 32 scenarios, 24 modules and 54 syntax lessons, no card. Pro is $29 a month or $249 a year and opens up all 170 scenarios, the 3D sandbox, an AI tutor and fault injection. Students and instructors get 50% off. Payments are non-refundable, though you can cancel anytime. It’s made by the team behind plcprogramming.io.