Standard Library

CODESYS provides the libraries standard.library and standard64.library by default.

standard.library includes all functions and function blocks required by IEC61131-3 as standard blocks for an IEC development system. While the development system implicitly recognizes an operator, the standard modules must be imported into the project in the form of a library.

standard64.library includes extensions for the timer and string functions. The timer blocks provide a higher resolution (nanoseconds) than the corresponding functions in the standard.library (milliseconds). However, this also leads to higher computational and memory requirements (64 Bit). The string blocks allow work with WSTRING character strings.