Lenze PLC Designer PLC Designer (R3-1) - Manual (Page 986)

L-force | PLC Designer
Programming Reference
984 DMS 4.1 EN 03/2011 TD29
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On the call sequence in case of inheritance please see: FB_exit, Execution order
Regard also the possibility of defining a function block instance method to be called
automatically after initialization via FB_init: attribute call_after_init
Interface of the init method:
METHOD fb_init : BOOL
VAR_INPUT
bInitRetains : BOOL; // if TRUE, the retain variables are initialized (warm start / cold
start)
bInCopyCode : BOOL; // if TRUE, the instance afterwards gets moved into the copy
code (online change)
END_VAR
The return value is not interpreted.
Note: Notice also the possible use of an "exit" method and the resulting execution
order: See FB_exit Method.
User defined input:
In an init method additional inputs can be declared. Those must be assigned at the
declaration of a function block instance.
Example for a init method for a function block "serialdevice"
METHOD fb_init : BOOL
VAR_INPUT
bInitRetains : BOOL; (* Initialization of retains *)
bInCopyCode : BOOL; (* Instance moved into copy code *)
nCOMnum : INT; (* additional input: number of the COM interface to listen at *)
END_VAR
Declaration of function block "serialdevice":
COM1 : serialdevice(nCOMnum:=1);
COM0 : serialdevice(nCOMnum:=0);