Identifiers

An identifier is a string of letters, numbers, and underscores (_), used to name and identify following entities:

• constants
• variables
• derived data types
• functions, function blocks, and programs
• tasks

A identifier must begin with a letter or underscore and must not contain spaces. National characters (accented characters) are not allowed in identifiers. Upper/lower case is not relevant.

Example:

IW215, QX75, IDENT, LIM_SW_5, abcd, ab_cd, _MAIN, _12V7