Function blocks

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Function blocks are created in logiccloud via the project tree. Within the node POUs you can create a new function block. To do this, right-click or go to the icon with the three dots and select Add POU, assign a name, select as type Function block and as Language Structured Text (ST). The structure is created automatically.

FUNCTION_BLOCK (* optional_begin *) FINAL|ABSTRACT (* optional_end *) Name

(* optional_begin *) USING Namespace_1;
USING Namespace_2; (* optional_end *)

(* optional_begin *) EXTENDS FB_name_1 (* optional_end *)

(* optional_begin *) IMPLEMENTS interface_1, interface_2, ... interface_n (* optional_end *)

(* optional: declaration of variables/instances *)

(* optional: declaration of methods *)

(* optional: body of function block *)

END_FUNCTION_BLOCK

Calls of function modules

FUNCTION_BLOCK FunctionBlock_1
VAR_INPUT
    INPUT_1: REAL;
    INPUT_2: REAL;
END_VAR

VAR_OUTPUT
    OUTPUT: REAL;
END_VAR

OUTPUT := INPUT_1 + INPUT_2;
END_FUNCTION_BLOCK

PROGRAM PRG

VAR_INPUT
    In1: REAL;
    In2: REAL;
END_VAR

VAR_OUTPUT
    Out: REAL;
END_VAR

VAR
    FB: FunctionBlock_1; // Instance of the function block
END_VAR

FB(
    INPUT_1 := In1,
    INPUT_2 := In2,
    OUTPUT => Out
);

END_PROGRAM