Function-extension:
A generic constant is a variable in the declaration area VAR_GENERIC CONSTANT of a function block. It can be used like a constant within a function block. The initial value is overwritten when the function block is instantiated.
Example:
When declaring function block instances, the generic constant is assigned a value that is only valid for this instance. This value is appended to the function block in angle brackets.
Example:
A function block with generic constants can also use the inheritance constructs EXTENDS and IMPLEMENTS.
Included in the following products:
PLC Designer V4.0
Application:
As shown in the example above, data types such as ARRAY or STRING can be used in function modules. For example, ARRAY or STRING data types can be declared in function blocks, the size of which is only determined when the function block is instantiated.
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