Operator: INI

The ‎INI‎ operator is an operator of CODESYS V2.3 Gateway Server. This operator is replaced by the ‎FB_Init‎ method as of CODESYS V3. However, you can still use this operator in projects that are imported from CODESYS V2.3 Gateway Server.

Syntax

<boolean variable name> := INI ( <FB instance name> , <boolean value> );
// <boolean value> : TRUE | FALSE

With the ‎INI‎ operator, you can trigger the initialization of retain variables of a function block instance used in a POU.

If the second parameter of the operator is ‎TRUE‎, then CODESYS initializes all retain variables which are defined in the function block ‎<FB instance name>‎ and then returns ‎TRUE‎.

Example in ST

‎fbinst‎ is the instance of the function block ‎fb1‎, where the retain variable ‎retvar‎ is defined.

VAR
    fbinst : fb1;
    b : BOOL;
END_VAR

b := INI(fbinst, TRUE);
ivar := fbinst.retvar; (* => retvar is initialized *)

Example in FUP

For more information, see: ⮫ “Variable: RETAIN ”, ⮫ “Preserving Data with Retain Variables ”