Label Classes - Mitsubishi Electric MELSEC Q Series Programming Manual

Label classes

The label class indicates from which POU and how a label can be used. Different classes can be selected according to the
type of POU.
The following table shows label classes.
Class
VAR_GLOBAL
VAR_GLOBAL_CONSTANT
VAR
VAR_CONSTANT
*1
VAR_RETAIN
VAR_INPUT
VAR_OUTPUT
VAR_IN_OUT
*1 Not supported by FXCPU.
• Input variables, output variables, and input/output variables
VAR_INPUT is an input variable for functions and function blocks, and VAR_OUTPUT is an output variable for
function blocks.
VAR_IN_OUT can be used for both input and output variables.
VAR_INPUT
VAR_IN_OUT
4 PROGRAM CONFIGURATION
30
4.3 Labels
Description
Common label that can be used in programs and function blocks
Common constant that can be used in programs and function blocks
Label that can be used within the range of declared POUs. This label
cannot be used in other POUs.
Constant that can be used within the range of declared POUs. This
constant cannot be used in other POUs.
Latch type label that can be used within the range of declared POUs This
label cannot be used in other POUs.
Label that receives a value. This label cannot be changed in a POU.
Label that outputs a value from a function block
Local label that receives a value and outputs the value from a POU. This
label can be changed in a POU.
Applicable POU
Program Function
 
 
 
 
 
 
 
 
VAR_OUTPUT
Function
block







