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3 Configuration of Instruction

FXCPU Structured Programming Manual

[Basic & Applied Instruction]

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.

The label classes indicate how they are used in which program parts. 
The table below shows the label classes.

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.

VAR_GLOBAL

A common label that can be used in all program parts. 

3

3

VAR_GLOBAL_CONSTANT

A common constant that can be used in all program parts.

3

3

VAR

A label used within declared program parts. It cannot be used
in other program parts.

3

3

3

VAR_CONSTANT

A constant used within declared program parts. It cannot be
used in other program parts.

3

3

3

VAR_INPUT

A label that receives values. It cannot be changed within
program parts.

3

3

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