The official CODeSYS Group store is the primary source. You may need to create a free account to access the "Download Area."

Requires Compatibility Mode or a Virtual Machine. Recommended System Specs RAM: 2 GB minimum. Storage: 1 GB of free hard drive space. Processor: Any modern Intel or AMD CPU. Step-by-Step Installation Guide

CODESYS 2.3 includes an integrated visualization editor. Engineers can design human-machine interfaces directly inside the programming project, which can then run locally on the PC or be downloaded to a compatible target graphic panel.

Many older, highly reliable PLCs and programmable gateways from manufacturers like WAGO, Beckhoff, Eaton, and IFM strictly require CODESYS V2.3.

What specific are you trying to program?

Change the file type filter to look for CODESYS V2.3 projects ( .pro ).

Because CODESYS V2.3 is a legacy product, finding the correct download link can sometimes be challenging. Avoid third-party torrent sites or unverified file-sharing blogs, as these files often contain malware or corrupted installation scripts. 1. The Official CODESYS Store

Check your Communication Parameters settings ( Online -> Communication Parameters ). Ensure that your local IP address matches the subnet of the target PLC and that the driver settings (e.g., TCP/IP vs. Serial) match the hardware manual configuration exactly. 6. Upgrading from CODESYS 2.3 to CODESYS V3

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 .

Despite being two decades old, CODESYS 2.3.9 is still actively used for:

: It remains the primary tool for maintaining older automation systems and machines that were built before the transition to V3.