Local Labels; Classes - Mitsubishi Electric MELSEC iQ-R Series User Manual

28.2

Local Labels

A local label is a label that can be used only in the declared POU. Local labels outside the declared POU cannot be used.
The settings of a local label include a label name, class, and data type.
28.3

Classes

The label class indicates from which POU and how a label can be used.
Different classes can be selected depending on the type of POU.
Global label
Class
VAR_GLOBAL
VAR_GLOBAL_CONSTANT
VAR_GLOBAL_RETAIN
Local label
Class
VAR
VAR_CONSTANT
VAR_RETAIN
VAR_INPUT
VAR_OUTPUT
VAR_OUTPUT_RETAIN
VAR_IN_OUT
VAR_PUBLIC
VAR_PUBLIC_RETAIN
28 LABELS
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28.2 Local Labels
Description
A common label that can be used in both program blocks and
function blocks
A common constant that can be used in both program blocks
and function blocks
A latch type label that can be used in both program blocks and
function blocks
Description
A label that can be used within the range of a declared POU.
This label cannot be used in other POUs.
A constant that can be used within the range of a declared
POU.
This label cannot be used in other POUs.
A latch type label that can be used within the range of a
declared POU. This label cannot be used in other POUs.
A label that inputs a value into a function or function block.
This label receives a value, and the received value cannot be
changed in a POU.
A label that outputs a value from a function or function block
A latch type label that outputs a value from a function block
A local label that receives a value and outputs the value from a
POU. The value can be changed in a POU.
A label that can be accessed as the public variable from other
POUs
A latch type label that can be accessed as the public variable
from other POUs
Applicable POU
Program Function block
block (FB)
 
 
 
Applicable POU
Program Function block
block (FB)
 
 
 
 
 
 
 
 
 
Function
(FUN)



Function
(FUN)








