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IEC 61131-3 Data types

10-6

DDS EN 2.3

No enumeration value must be used twice.

Example:

TRAFFICLIHTS: (red, yellow, green);

COLOUR: (blue, white, red);

Error: red must not be used for TRAFFICLIGHTS and COLOUR.

10.2.4 Structures

Structures are saved as objects in the

Object Organizer

on the index card Data types, start with the

keywords TYPE and STRUCT and end with END_STRUCT and END_TYPE.

Structure declarations have the following syntax:

TYPE <Structure name>:

STRUCT

END_STRUCT

END_TYPE

<Structure name> is now a type known throughout the entire project and can be used like a standard

data type.

Nested structures are permitted, the only restriction being that variables cannot be set to addresses.

An AT declaration is not permitted!

Structure components are accessed with the following syntax:

<Structure_name>.<Component name>

For instance, the structure ”Week” including the component ”Monday” can beaccessed as follows:

Week.Monday

Example:

Structure definition for a polygon

TYPE Polygon:

STRUCT

Start: ARRAY [1..2] OF INT;

Point1:ARRAY [1..2] OF INT;

Point2:ARRAY [1..2] OF INT;

Point3:ARRAY [1..2] OF INT;

Point4:ARRAY [1..2] OF INT;

End: ARRAY [1..2] OF INT;

END_STRUCT

END_TYPE

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Lenze DDS v2.3 Manual de usuario Pagina 262