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Operator - Library namespacedl-permalink__symbolPermalink

This operator is an extension of the IEC 61131-3 standard.

Syntax: ‎<library namespace>.<library identifier>‎

Example: ‎LIB_A.FB_A‎

A library module identifier is appended with the library namespace (as a prefix separated by a dot) for unique and qualified access to the library module. The namespace usually coincides with the library name.

Example

A library is included in a project and contains the module ‎FB_A‎. However, the function block with the same name is already available locally in the project. Identify the library module as ‎LIB_A.FB_A‎ in order to access the library module, not the local function block.

var1 := FB_A(in := 12); // Call of the project function FB_A 
var2 := LIB_A.FB_A(in := 22); // Call of the library function FB_A

You can define another identifier for the namespace. To do this, specify a namespace in the project information (library developers: when creating a library project). As an alternative, you can specify a specific namespace for a library in the library manager in the “Properties” dialog box (application developers: when creating an application).