Codesys 2.3.9 Download Link

The official source is the CODESYS Store (formerly the CODESYS Forge). Here is the direct path:

⚠️ Beware of third-party sites: Many untrusted websites offer “cracked” or “free” versions. Always download from the official CODESYS archive to avoid malware. A free license for 2 hours of runtime (for testing) is included; full licenses must be purchased from your PLC manufacturer. codesys 2.3.9 download

Since CODESYS 2.3.9 uses 16-bit installation components, it will not run natively on 64-bit Windows. Follow these steps: The official source is the CODESYS Store (formerly

CODESYS (Controller Development System) is a hardware-independent automation software platform widely used in the industry for programming PLCs. While the current standard is CODESYS 3.5 (and the newer 4.x series), version 2.3.9 represents the final stages of the "CODESYS V2" architecture. ⚠️ Beware of third-party sites: Many untrusted websites

Many industrial machines deployed in the early 2000s utilize PLCs that rely strictly on the V2.x runtime. Consequently, automation engineers and system integrators frequently require access to CODESYS 2.3.9 for maintenance, troubleshooting, and patching of existing infrastructure.

The CODESYS Group maintains an archive legacy portal. You can sometimes find the installer through:

| Requirement | Details | |-------------|---------| | Operating System | Windows XP, Vista, 7 (32-bit). Windows 10/11 64-bit requires a virtual machine (e.g., VirtualBox or VMware) running Windows 7 32-bit. | | Target PLCs | Any CODESYS V2.3 runtime (e.g., Wago 750-841, Beckhoff BC/BX series, older Eaton XC). | | Programming Languages | IL, ST, FBD, LD, SFC (CFC is optional). |