Unlike modern software, the CODESYS Group does not publicly host V2.3.9 on their main website anymore (they promote V3.5). However, several exist:
CODESYS GmbH officially discontinued support for V2.3 at the end of 2019. All new developments – including new libraries, new drivers, and new runtime systems – are created exclusively for V3.5. For this reason, many engineers eventually need to . codesys 2.3.9 download
As a last resort, the Internet Archive has snapshots of the old CODESYS FTP server. Use with caution – verify file hashes (MD5/SHA256) if available. Unlike modern software, the CODESYS Group does not
Many older PLCs from brands like WAGO, Eaton, and Schneider Electric only support V2.3. For this reason, many engineers eventually need to
Generally free for development; runtimes on hardware usually require a license Programming
Download the installation archive (typically a .zip file or a direct executable setup).