Only download 2.3.9 if you must support existing hardware. For learning or new projects, get V3.5.
Working with CoDeSys 2.3.9 means managing projects that might be decades old. Protect your engineering investments by following these project management workflows:
CoDeSys relies heavily on external libraries for advanced tasks like Modbus communication, PID control, or string handling. When opening a legacy project from a backup, you will often see a "Missing Library" error. You must locate these .lib files from the original machine builder or the component vendor and place them into the CoDeSys Library directory on your hard drive. Troubleshooting Common CoDeSys 2.3.9 Issues 1. "Communication Error (#0): Target Omits Response" codesys 2.3.9 download
| Problem | Likely Fix | |---------|-------------| | Installer crashes on Windows 10 | Use a 32-bit VM; the installer is 16-bit. | | Cannot connect to PLC | Check the gateway: CODESYS Gateway V2.3 must be running. | | Missing device | Download the correct from your PLC vendor. | | License expired | The 2-hour demo resets each time you start the PLC. For permanent use, buy a license via the PLC hardware key. |
You can download CODESYS V2.3 (specifically version ) through several official manufacturer channels, as the older V2.3 branch is often bundled with specific hardware support. Official Download Sources Manufacturer Portals Only download 2
To obtain a legitimate, malware-free copy of the software, use these official channels:
If using a USB-to-Serial adapter, ensure the COM port number in Windows Device Manager matches the COM port specified in the CoDeSys communication settings. Troubleshooting Common CoDeSys 2
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 .
Distributes "XSoft-CoDeSys" for their XV and XC series PLCs.