“Fix Version”

Defines the compiler version that CODESYS uses when compiling and downloading for compile (for example, “3.5.6.0” for version 3.5 SP6).

“Allow unicode characters for identifiers”

Cleared by default because using Unicode characters in identifier names is not permitted in the IEC standard. May be required for some foreign languages (for example, Asian languages).

“Replace constants”

(default): CODESYS loads the value directly for every scalar constant (not for strings, arrays, and structures). In online mode, CODESYS marks the constants with a symbol that is prepended to the value in the declaration editor or monitoring view. In this case, access is not possible, for example by means of an ‎ADR‎ operator, forcing, and writing.

: Access to constants is possible, but it prolongs the computation time.

“Enable logging in breakpoints”

For breakpoints that are defined as execution points, you can create a message text in the “Execution point settings” dialog box. CODESYS prints this text to the device log when the application halts at the execution point.

“Maximum number of warnings”

Refers to the warnings that CODESYS prints to the messages view.

You define the selection of displayed compiler warnings in the “Project Settings” dialog box in the “Compiler Warnings” category.