Most users require version 2.3.9 for specific hardware. Manufacturers provide customized "Target" packages that include the base CODESYS 2.3 software along with necessary device descriptions .
CODESYS 2.3.9 (specifically version 2.3.9.x) legacy development system is available for download through several official channels, primarily depending on the hardware manufacturer you are using. While CODESYS V3 is the current standard, V2.3 remains in a "service phase" for maintenance of existing industrial controllers. CODESYS Group Official Download Sources codesys 2.3.9 download
: Often, the best way to get a stable 2.3.9 build is through PLC hardware vendors like WAGO , Eaton , or ABB . They provide customized versions of the 2.3 IDE tailored to their specific "Targets." Most users require version 2
Only download 2.3.9 if you must support existing hardware. For learning or new projects, get V3.5. While CODESYS V3 is the current standard, V2
CODESYS 2.3.9 was designed for Windows XP/7. If you are on Windows 10 or 11 , you must run the installer in Compatibility Mode .