Certificate Expired If the certificate from the controller for encrypted communication has expired (valid from "not before" until "not after"), you get a prompt with a corresponding message in CODESYS

New Certificate (while the current one is still valid) A new certificate can be issued before the existing certificate expires. This makes it possible for the encrypted communication to continue seaml

CA-Signed Certificates Preferred (PLC Shell) In case the CODESYS Security Agent is not installed, you can also request and provide controller certificates by means of the PLC Shell interface in the de

Problems at Login If you have entered an incorrect password when logging in to the user management of the controller, then the login dialog reappears immediately afterwards. After three incorrect atte

Permitting Encrypted Communication Again Tip Remember that not every controller supports the deactivation of encrypted communication. Important We strongly advise against disabling encrypted communica

Reference: Programming :

Programming Languages and Editors You program a POU in each case in the editor for the implementation language which you have selected when you created the POU. CODESYS provides a text editor for ST a

Declaration Editor In the declaration editor, you declare variables in variable lists and POUs. If the declaration editor is used with an implementation language editor , then is opens in a view above

Common Functions in Graphical Editors The implementation part of the graphical editors for FBD, LD, CFC, and SFC contains a toolbar in the lower right corner: Return to normal editing mode The mouse p

Structured Text and Extended Structured Text (ExST) :