Lenze DDS v2.3 Bedienungsanleitung PDF herunterladen (Seite 133)

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l DDS EN 2.3

7.2.1 Declaration part

The declaration part of an organization unit declares all variables locally.

These may be

• input variables,

• output variables,

• input / output variables,

• local variables,

• retentive variables,

• constants

• and retentive constants.

The declaration syntax is based on the IEC 61131-3 standard.

7.2.1.1 Declaration keywords

Icon: - Menu: InsertWDeclaration k eywords Keyboard: -

Use this command to open a list of all keywords available for use in the declaration part of an

organization unit.

• The keyword will be inserted at the current cursor position once it has been selected and

confirmed.

• The list will also be displayed when calling the Help Manager and selecting the category

Declarations

7.2.2 Input variables

Between the keywords VAR_INPUT and END_VAR, all variables are declared that are used as input

variables for an organization unit.

• The values of these variables can be transferred from the calling unit.

Example:

VAR_INPUT

in1:INT; (* 1. input variable *)

END_VAR

Input variables can be used to transfer data from the calling to the called organization unit.

7.2.3 Output variables

Between the keywords VAR_OUTPUT and END_VAR, all variables are declared that are used as

output variables for an organization unit.

• The values of these variables are returned to the calling organization unit for further use.

Example:

VAR_OUTPUT

out1:INT; (* 1. output variable *)

END_VAR

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Lenze DDS v2.3 Bedienungsanleitung Seite 133