Codesys 2.3.9 Download ((better)) Access

The "Old Reliable" of Automation: Why We’re Still Downloading CODESYS 2.3.9

Allow device driver installation – When prompted, accept the installation of the “CODESYS Gateway” (a service that connects the IDE to runtimes).

Finish and restart – Reboot to ensure the Gateway service starts properly.

Full IEC 61131-3 support (IL, ST, FBD, LD, SFC, CFC).
Stable runtime for embedded and PC-based controllers.
Lightweight installation (under 200 MB).
Offline simulation without needing a physical PLC.
Direct commissioning for dozens of legacy PLC brands.

The official CODESYS forum ( forge.codesys.com ) has sticky posts with legacy download links. You must create a free account to view attachments. codesys 2.3.9 download