Lenze PLC Designer PLC Designer (R3-1) - Manual (Page 84)

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Concepts and Base Components
82 DMS 4.1 EN 03/2011 TD29
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Method call:
Method calls are also named "virtual function calls". Please see: Method invocation.
Note:
All data of a method is temporary and only valid during the execution of the method
(stack variables).
In the body of a method access to the function block instance variables is allowed.
THIS Pointer: You can use identifier "THIS" to point directly to the implicit function
block instance, which is available automatically. Notice that a locally declared
variable might hide a function block variable. So in case of the example shown
above in the syntax description "THIS^.x" would not refer to the methods input x,
but to the function block variable x.
VAR_IN_OUT or VAR_TEMP-variables of the function block can not be accessed in a
method!
Methods defined in an Interface are only allowed to have input-, output and inout-
variables, but no body (implementation part).
Methods, like functions, can have additional outputs. Those must be assigned
during method invocation
Special methods for a function block:
Init method: A method named "FB_init" always is declared implicitly, but also can be
declared explicitly. It contains initialization code for the function block as declared in
the declaration part of the function block. See: FB_Init method.
Reinit method: If a method named "FB_reinit" is declared for a function block instance,
it will be called after the instance has been copied and will reinitialize the new
instance module. See: FB_reinit method.
Exit method: If an exit method named "FB_exit" is desired (for example for
deallocating any , it must be declared explicitly. There is no implicit declaration. The
exit method will be called for each instance of the function block before a new
download, a reset or during online change for all moved or deleted instances. See:
FB_exit method.
Properties: Set and Get methods; see: Property.