INI Operator

Overview

NOTE: The INI operator is obsolete. The method FB_init replaces the INI operator. For further information about the FB_init method, refer to the chapter FB_init, FB_reinit Methods. However, the operator can still be used for keeping compatibility with projects imported from earlier EcoStruxure Machine Expert versions.

You can use the INI operator to initialize retain variables which are provided by a function block instance used in the POU.

Assign the operator 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 FBD