What is the best PLC simulator for learning?
For most people, Factory I/O paired with a soft PLC or real controller, because it gives you a 3D process that reacts to your logic and fails in believable ways. If cost is the constraint, CODESYS is free, standards-based and genuinely capable. The rest suit specific vendors or budgets.
The 8 compared
| # | Tool | Cost | Realism | Best for |
|---|---|---|---|---|
| 1 | Factory I/O | Paid, trial available | High (3D process) | Sequencing and full projects |
| 2 | CODESYS | Free | Medium | IEC 61131-3, structured text |
| 3 | Siemens PLCSIM (in TIA) | Free within trial | High for Siemens | Siemens-targeted study |
| 4 | Rockwell Emulate / Studio 5000 | Licensed | High for Rockwell | Rockwell-targeted study |
| 5 | OpenPLC | Free | Medium | Runtime concepts, Raspberry Pi |
| 6 | LogixPro | Low cost | Low (2D) | Absolute beginners, ladder basics |
| 7 | Ignition (trial mode) | Free in trial | High for SCADA | Tags, alarms, historians |
| 8 | Vendor web simulators | Free | Low | Quick familiarisation |
What can a simulator not teach you?
Everything physical. Wiring errors, loose terminals, earthing and screening problems, electrical noise, panel heat, and the discipline of working safely on a live system. A simulator will never give you a reading that is wrong because the screen is earthed at both ends. Treat simulation as logic practice and hardware time as a separate, non-optional requirement — which is why our cohorts cap at 12, so the panels are actually available.
Which combination should you use?
- No budget: CODESYS + OpenPLC on a Raspberry Pi
- Targeting Siemens employers: TIA Portal trial + PLCSIM + Factory I/O
- Targeting Rockwell employers: Studio 5000 + Emulate + Factory I/O
- Wanting SCADA too: add Ignition in trial mode
See the 10 software tools used in Gulf industry for which vendors dominate locally.