Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 505)

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IEC Operators and additional norm extending functions

DMS 3.2 EN 02/2011 TD29 503
9.11 Initialization Operator
9.11.1 INI Operator
The INI operator can be used to initialize retain variables which are provided by a
function block instance used in the POU.
The operator must be assigned to a boolean variable.
Syntax: <bool-Variable> := INI(<FB-instance, TRUE|FALSE)
If the second parameter of the operator is set to TRUE, all retain variables defined in
the function block FB will be initialized.
Example in ST:
fbinst is the instance of function block fb, in which a retain variable retvar is defined.
Declaration in POU:
fbinst:fb;
b:bool;
Implementation part:
b := INI(fbinst, TRUE);
ivar:=fbinst.retvar (* => retvar gets initialized *)
Example of operator call in IL:
LD fbinst
INI TRUE
ST b
Example of operator call in FUP: