Program; Functions - Mitsubishi Electric MELSEC Q Series Programming Manual

Program

A program is an element that is stated at the highest level of POU. Functions, function blocks, and operators are used to edit
programs.
Program
Sequence programs executed in a programmable controller CPU are created by programs of POU. For a simplest sequence
program, only one program needs to be created and registered to a task in order to be executed in a programmable controller
CPU.
Programs can be described in the ST or structured ladder/FBD language.

Functions

Functions and operators are used to edit functions. Functions can be used by calling them from programs, functions, or
function blocks.
Function
Functions always output same processing results for same input values. By defining simple and independent algorithms that
are frequently used, functions can be reused efficiently.
Functions can be described in the ST or structured ladder/FBD language.
Function
Function block
Operator
Function
Operator
4 PROGRAM CONFIGURATION
4.2 POUs
4
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