Despite belonging to the obsolete library, certain functions are described in the documentation for the general library.

The following table provides a summary of these functions, and indicates the correspondence between the function family through which they can be accessed using Control Expert, and that of the general library where they are described in the documentation.

This library includes the functions from previous software generations. Conserving these functions makes it possible to convert applications created by software products other than Control Expert, as well as enabling users to carry on programming as before. In most cases, functions are specific to an API range. However, it should be noted that these functions are not IEC 61131-3 compliant, and that in certain cases, IEC-equivalent functions do exist.

It is therefore recommended not to use this library for creating program modules that are transferable from one PLC to another.