Lenze PLC Designer PLC Designer (R2-x) Instrukcja Użytkownika Pobierz pdf (Strona 260)

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L-force | PLC Designer

Editors in PLC Designer

258 DMS 3.2 EN 02/2011 TD29 

7.2.9 Constants, Typed Literals

Constants are identified by the key word CONSTANT. They can be declared locally or

globally.

Syntax:

VAR CONSTANT

<Identifier>:<Type> := <initialization>;

END_VAR

Example:

VAR CONSTANT

c_iCon1:INT:=12; (* 1. Constant*)

END_VAR

See "Operands in »PLC Designer«" for a listing of possible constants. See there also

regarding the possibility of using typed constants (Typed Literals).

7.2.10 External variables

Global variables which are to be imported into the POU are designated with the

keyword EXTERNAL. They also appear in the Watch window of the declaration part in

Online mode.

If the VAR_EXTERNAL declaration does not match the global declaration in every

respect, the following error message appears: "Declaration of '<var>' does not match

global declaration!"

If the global variable does not exist, the following error message appears: "Unkown

global variable: '<var>'!"

Example:

VAR EXTERNAL

iVarExt1:INT:=12; (* 1st external variable *)

END_VAR

7.2.11 Keywords

Keywords are to be written in uppercase letters in all editors. Keywords may not be

used as variables. Examples for keywords: VAR, VAR_CONSTANT, IF, NOT, INT. See the

list of keywords valid in »PLC Designer«.

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