User experiences highlight several quirks regarding stability and versioning:
CODESYS 2.3.9 is not for new projects; it is for . Unlike the modern, highly modular V3 interface, V2.3 offers a single-window, MDI (Multiple Document Interface) environment that many veteran PLC programmers find incredibly fast for troubleshooting.
While the latest version of CODESYS (V3.5) is the primary focus of the CODESYS Store, older 2.3 versions are typically obtained through the following channels:
If you can't "Login" to your PLC, check your Gateway settings. Most 2.3.9 connections use TCP/IP or Serial (RS232).
A guide on how to to the modern V3.5 format.
