Data Structure: STRUCT

A structure is a user-defined data type, which combines multiple variables of any data type into a logical unit. The variables declared within a structure are called members.

You make the type declaration of a structure in a “DUT” object which you create in the “Project Add Object DUT” menu or in the context menu of an application.

Syntax

‎TYPE <structure name>‎

‎STRUCT‎

‎ <member name> : <data type> := <initialization> ;‎

‎END_STRUCT‎

‎END_TYPE‎

This identifier is valid in the entire project so that you can use it like a standard data type.

<member name> : <data type> ;

Declaration of a member

Any number of declarations can follow, but at least 2.

Structures can also be nested. This means that you declare a structure member with an existing structure type. Then the only restriction is that you must not assign any address to the variable (structure member). The AT declaration is not permitted here.

:= <initialization>

Optional

Example

Type declaration

TYPE S_POLYGONLINE :
STRUCT
    aiStart : ARRAY[1..2] OF INT := [-99, -99];
    aiPoint1 : ARRAY[1..2] OF INT;
    aiPoint2 : ARRAY[1..2] OF INT;
    aiPoint3 : ARRAY[1..2] OF INT;
    aiPoint4 : ARRAY[1..2] OF INT;
    aiEnd : ARRAY[1..2] OF INT := [99, 99];
END_STRUCT
END_TYPE

Extension of a type declaration
Declaration and initialization of structure variables
Access to a structure member
Symbolic bit access in structure variables