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Resources

8-2

DDS EN 2.3

8.1 Global variables

The tab card Resources in the

Object Organizer

contains the global variable list (Global_Variables)

in the folder Global variables.

• All variables defined in this object are known throughout the entire project.

• Double-click the object Global_Variables to open and edit the variable list.

Global variables

Normal global variables are defined in an object between the keywords VAR_GLOBAL and END_VAR:

VAR_GLOBAL

(* Variable declarations *)

END_VAR

Retentive global variables

Retentive global variables are assigned the additional keyword RETAIN:

VAR_GLOBAL RETAIN

(* Variable declarations *)

END_VAR

Global constants

Global constants are assigned the additional keyword CONSTANT:

VAR_GLOBAL CONSTANT

(* Variable declarations *)

END_VAR

Retentive global constants

Retentive global constants are assigned the additional keyword CONSTANT RETAIN:

VAR_GLOBAL CONSTANT RETAIN

(* Variable declarations *)

END_VAR

8.1.1 Several variable lists

If a large number of global variables has been declared, and the global variable list is to be structured

better, the setup supports the generation of additional variable lists.

1. Open the

Object Organizer

and select the folder

Global variables

or one of the existing

objects with global variables.

2. Execute menu command Project➞

➞➞

➞Insert object.

3. Name the object in the dialog box.

This will create a new object with the keyword VAR_GLOBAL.

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