A variable of data type STRING can have contain any character string. The amount of memory that is reserved during a declaration refers to characters and is shown in parentheses or brackets. If a size is not defined, then CODESYS allocates 80 characters by default.
As a rule, CODESYS does not limit the string length. However, the string function processes lengths of 1–255 only. If a variable is initialized with a string that is too long for the data type, then CODESYS truncates the string accordingly from the right.
NOTICE
The memory required for a STRING variable is always one byte per character plus one additional byte (for example, 81 bytes for a "STRING(80)" declaration).
Example of a string declaration with 35 characters:
str : STRING(35):= 'This is a String';