Codesys 2.3.9 ((exclusive)) Download Jun 2026

Tens of thousands of operational machines globally rely on PLCs programmed with CoDeSys 2.3. Maintenance engineers need this specific version to perform modifications, diagnostics, and backups.

To help find the exact manufacturer targets or documentation you need, let me know:

Finding a legitimate copy of CODESYS 2.3.9 can be challenging because the manufacturer, CODESYS GmbH, has discontinued official downloads for V2.x products. Nevertheless, the IDE itself is free to use, and you can obtain a copy from several sources. codesys 2.3.9 download

CoDeSys 2.3.9 was designed during the Windows XP and Windows 7 era. To run it reliably on modern systems like Windows 10 or Windows 11, execute the installer and the application executable using and set the compatibility mode to Windows 7 . CoDeSys 2.3.9 Download and Installation Process Step 1: Locating the Correct Download

| Problem | Solution | |---------|----------| | | Run in compatibility mode: Right-click setup → Properties → Compatibility → Windows 7. | | Gateway service fails to start | Open Services.msc → Find “CODESYS Gateway” → Set to Automatic → Start manually. | | Cannot find target device | Download the specific “.TRG” (target file) from your PLC manufacturer’s site and place it in \CODESYS V2.3\Targets . | | Visualization flickers | Disable hardware acceleration in the IDE settings. | | License lost after reboot | Run as Administrator once to register license dongle emulation (if using demo mode). | Tens of thousands of operational machines globally rely

Test your entire program without physical hardware by toggling the "Simulation" mode under the Online menu. Moving Forward: Migration to CODESYS V3

The full version string usually looks like 2.3.9.x (e.g., 2.3.9.60, 2.3.9.68). Later patch versions add stability fixes and better compatibility with modern Windows environments. Nevertheless, the IDE itself is free to use,

32-bit application (runs in Program Files (x86) on 64-bit OS) Important Windows 10 and Windows 11 Workarounds

| Feature | CODESYS 2.3.9 | CODESYS V3.5+ | |---------|---------------|----------------| | | ~2008 | 2013–present | | IEC languages | All (IL, ST, FBD, LD, SFC, CFC) | All + OOP extensions | | 64-bit support | No | Yes | | Modern hardware | Limited (legacy only) | All new PLCs | | Git integration | No | Yes | | Security | No encryption | TLS, user management | | Best for | Maintain old machines | New development |

Many automation hardware vendors provide custom-branded versions of CODESYS 2.3.9 bundled with their specific target files (PLC drivers).

The project uses specific PLC hardware definitions not included in the base download.