Libraries - Mitsubishi MELSEC-Q Series Programming Manual

4.7

Libraries

A library is an aggregation of data including POUs, global labels, and structures organized in a
single file to be utilized in multiple projects.
The followings are the advantages of using libraries.
• Data in library files can be utilized in multiple projects by installing them to each project.
• Since library data can be created according to the functions of components, data to be reused
can be easily confirmed.
• If components registered in a library are modified, the modification is applied to projects that
use the modified data.
The following figure shows the data flow when using library components in a project.
Library file

4.7 Libraries

4-52
Program block
Install
Global label
Function block
Function
Structure
POUs can be
called from the
programs in the
project.
Project
Library
Program block
Global label
Function block
Function
Structure
Global label
Program file
Task
POU
Program block
Function
Function block
Structure
Edit
Utilize
Installed library can be
registered in the task
of the project.