Mitsubishi Electric MELSEC iQ-F Series - Page 25

3 PROGRAM ORGANIZATION UNITS
3.3 Function Blocks (FB)
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■Creating instances
A function block needs to be instantiated to be used in programs.
By creating instances, a function block can be called and executed by a program block or another function block.
Declare instances with global labels or local labels.
*1 Local labels can be declared as the local labels of a program block or function block. Local labels cannot be declared in a function.
Same function blocks can be instantiated with different names in a single POU.
Label type Instance type Class
Global label Global FB VAR_GLOBAL
Local label
*1
Local FB VAR
(1) Same instances use the same internal variables.
(2) Different instances use different internal variables.
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(2)
(1)
Instance A
Function block
Instance A
Function block
Instance B
Function block
Input variable 1
Input variable 2
Output variable
Input variable 3
Local variable
Input variable 2
Output variable
Input variable 3
Local variable
Input variable 1
Input variable 1
Output variable
Input variable 1
Local variable
Input variable 1