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With compiler version >= 3.5.18.0, UTF-8 encoded string literals are possible as a single-byte string with base ‎STRING‎.

Syntax:

‎UTF8#' <string literal> '‎

Constant declaration 

VAR CONSTANT
    constA : STRING := UTF8#'aäoöuü';
    constB : STRING := UTF8#'Hello Allgäu $21'; // Hello Allgäu!
END_VAR

To ensure correct monitoring, the ‎'monitoring_encoding' := 'UTF-8'‎ attribute can be added.

UTF-8 encoding only for project-wide configuration

UTF-8 encoding only for project-wide configuration

A UTF-8 encoding is used if the project-wide compile option “UTF8 encoding for STRING” is enabled. Library functions and add-ons are then also oriented according to this setting.

If you use single UTF-8 encoded strings, then you have to make sure that they are interpreted correctly wherever they are used. For example, a string variable in the OPC server will be converted to UTF-8 before being transferred to a client if the setting is not selected. Values such as ‎UTF8#'äöü'‎ would then be misinterpreted. Similar problems can arise when outputting strings in the visualization.