Evidence-checked comparison · reviewed July 24, 2026
CODESYS vs PLC Simulation Software: PLC Software Comparison
CODESYS is an engineering system for compatible PLCs and runtimes. PLC Simulation Software is a browser-based learning environment. They overlap in PLC logic practice, but they are not interchangeable products.
Direct answer
Choose CODESYS for the device; choose browser practice for the learning loop
Use CODESYS to configure a compatible controller, compile against its device package, download to its runtime, work online or commission real I/O. Use PLC Simulation Software for guided, low-friction practice before hardware selection or before reproducing the exercise in CODESYS. For a real project, browser simulation is preparation—not the final engineering tool.
CODESYS vs PLC Simulation Software at a glance
This comparison deliberately omits synthetic scores and unsourced market-share percentages. Every row describes a boundary that can be checked against documentation or a repeatable project.
| Decision | CODESYS | PLC Simulation Software |
|---|---|---|
| Primary job | Engineer, compile, download and diagnose applications for a compatible CODESYS target. | Learn and practise PLC logic in a browser with guided lessons and machine scenarios. |
| Physical PLC deployment | Yes, when the controller, runtime, device package, firmware and licence are compatible. | No. It is not a production runtime and cannot replace the target engineering tool. |
| Starting environment | Windows engineering installation, matching device packages and an appropriate runtime or target. | A modern browser and free account; no credit card is required for the free tier. |
| Best first use | A device-specific proof project or real controller project where the target is known. | Structured practice before hardware selection or before rebuilding the exercise in CODESYS. |
| Portability boundary | IEC languages transfer conceptually, but libraries, fieldbus configuration and runtime behavior remain target-specific. | Dialect practice teaches transferable patterns; native CODESYS project export and exact runtime emulation are not guaranteed. |
| Safety and commissioning | Only within the exact supported safety product, engineering process and validated hardware configuration. | Not a safety system, commissioning tool or substitute for testing the physical machine. |
Verified product facts
CODESYS Development System
Free IDE; target runtime and add-ons are separate decisions
- The Development System is a free Windows engineering download with IEC 61131-3 editors.
- The base installation includes a Control Win SL demo; a demo is not an activated production runtime.
- Production runtimes, device packages and professional tooling can have separate licences and compatibility rules.
- The newest CODESYS release is not automatically correct for every vendor controller.
PLC Simulation Software · facts 2026-07-24.3
Browser-based PLC learning and practice
- 8 listed dialects: IEC 61131-3, Allen-Bradley, Siemens SCL, Mitsubishi, Omron, Schneider Unity, Delta, Instruction List.
- 12 core lessons with 6 free lessons per dialect.
- 140 source-catalogued practice records; visible access varies by account, tier, entitlement and rollout.
- The free tier does not expire and does not require a credit card.
| Simulator plan | Monthly | Annual | Boundary |
|---|---|---|---|
| Basic | $12 | $99 | Access does not create CODESYS device compatibility. |
| Pro | $29 | $249 | Paid practice is still not a licensed production runtime. |
USD prices are the product-facts snapshot reviewed July 24, 2026. Check the destination before purchase. CODESYS pricing must be checked separately for the required runtime, target and add-ons.
A reproducible CODESYS evaluation plan
The protocol is published before product scores. No CODESYS-versus-PLC-Simulation-Software benchmark winner is claimed here because completed comparative results have not been published. Use this plan for your own proof-of-fit.
- 1
Freeze the environment
Record IDE build, operating system, target device, runtime, device package, compiler and library versions. “CODESYS V3” is not a reproducible version description.
- 2
Use one representative program
Build a stop-priority motor seal-in, then add an on-delay timer, counter, rising edge and a forced fault. Apply the same expected input/output sequence in both environments.
- 3
Separate learning from deployment
Use browser practice to understand the sequence. Rebuild it natively in CODESYS and resolve target-specific syntax, libraries, task configuration and I/O mapping there.
- 4
Observe execution
Record timer boundaries, scan order, diagnostics and restart behavior. A project that merely compiles has not demonstrated equivalent execution.
- 5
Prove persistence
Save, close, reopen and rerun the program. Record what can be shared or exported and what remains tied to the original product or target.
- 6
Finish on the real target
Verify firmware, communications, retained data, watchdogs, outputs, interlocks and recovery on the actual controller and machine under an approved test plan.
Minimum test record
Record the program, input sequence, observed output and product version for every case. Unsupported is a valid result; missing evidence is not a pass.
| Case | Expected evidence |
|---|---|
| Stop-priority seal-in | Start latches; stop wins when both inputs are true |
| TON boundary | Output changes at the documented preset boundary and resets correctly |
| Counter and reset | One increment per qualifying event; reset restores the documented state |
| Rising edge | Pulse is true for one scan after a false-to-true transition |
| Scan order | Three repeated runs produce the same documented order |
| Save and reopen | Logic, tags and instruction settings survive the round trip |
Who each option is for
Choose CODESYS now if…
- You know the exact compatible controller or runtime.
- You must configure I/O, networks, visualisation, motion or target-specific libraries.
- You need online diagnostics, download, commissioning or a production archive.
- Your employer, customer or course explicitly requires CODESYS.
Start with browser practice if…
- You are learning ladder logic or Structured Text before choosing hardware.
- You want guided exercises without a Windows installation.
- You want to practise the same control pattern across PLC dialects.
- You will rebuild and verify the final project in the real target environment.
Limitations that affect the decision
CODESYS boundaries
- A free IDE does not mean every production runtime or add-on is free.
- Device packages, libraries and vendor-certified versions constrain portability.
- Desktop simulation cannot validate real I/O, networks, safety or machine timing.
PLC Simulation Software boundaries
- This is a learning and prototyping simulator, not a production PLC or a substitute for testing on the target controller and hardware.
- Vendor dialect support teaches transferable syntax and logic patterns; it does not emulate every instruction or firmware behavior of each vendor runtime.
- Scenario and lesson access varies by account state, plan, entitlement and feature rollout.
- Native vendor project-file export is not guaranteed.
Sources and evidence status
CODESYS claims link to the publisher. Simulator claims come from the versioned product-facts endpoint. Comparative benchmark results remain pending, so this page names no scored winner.
Official scope of the free IEC 61131-3 engineering system and included Control Win SL demo.
Official release and patch history. A controller manufacturer may certify a different service pack.
Official installer, package history and current Store terms.
Separate professional tooling for Git, static analysis, profiling and test automation workflows.
Versioned source for account access, dialects, curriculum, catalog, pricing and limitations.