Chapter 3 Program Organization Unit (Pou) - Mitsubishi Electric MELSEC iQ-F FX5 Programming Manual

3
PROGRAM ORGANIZATION UNIT (POU)
The POU includes the following types.
• Function
• Function block
The processing of each POU can be described in a programming language according to the control. POUs are called from a
program block, and then executed.
Project
Program file
POU
POU folder
POU
POU
A structured program is a program created by components. Processes in lower levels of hierarchical program
are divided to several components according to their processing information and functions.
Each component is designed to have a high degree of independence for easy addition and replacement.
The following shows examples of the process that would be ideal to be structured.
• A process that is used repeatedly in a program
• A process that can be divided into functions
This chapter describes two types of POUs using labels.
Devices can also be used in the program of a function or function block. For details on devices, refer to the following.
User's manual (Application)
Use
Program block
Function block
Function
3 PROGRAM ORGANIZATION UNIT (POU)
3
11