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3 Configuration of Instruction
3.2 Labels
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
3.2 Labels
Types of labels
Labels are either global labels or local labels.
• Global labels are available for use in program blocks and function blocks.
• Local labels are available for use only in a declared program part.
Label classes
The label classes indicate how they are used in which program parts.
The table below shows the label classes.
Definition of labels
Before using a label, the label needs to be defined. An error is generated if attempting to convert (compile) a
program where the label is not defined.
• Where defining a global label, the label name, class, data type and device are interrelated.
• Where defining a local label, the label name, class and data type are set.
The user does not have to specify a device when using a local label. A device is allocated automatically
during the compilation.
The following is an example of setting the label Var_dint1 and Var_dint2 of a DMOV instruction.
• When using as a global label:
Set the class, label name and data type and device or address.
Label class Descriptions
Program parts available for use
Program
block
Function
Function
block
VAR_GLOBAL A common label that can be used in all program parts. 33
VAR_GLOBAL_CONSTANT A common constant that can be used in all program parts. 33
VAR
A label used within declared program parts. It cannot be used
in other program parts.
333
VAR_CONSTANT
A constant used within declared program parts. It cannot be
used in other program parts.
333
VAR_INPUT
A label that receives values. It cannot be changed within
program parts.
33
VAR_OUTPUT A label for output from a function block. 3
VAR_IN_OUT
A local label that receives values and outputs from a program
part.
3
DMOV
EN
s
ENO
d
X000
Var_dint1 Var_dint2