Rockwell-automation 1753-PCS-PAR Using RSLogix Guard PLUS! with GuardP Instrukcja Użytkownika Pobierz pdf (Strona 90)

Publication 1753-PM001A-EN-P - November 2005

8-4 Create User-Defined Function Blocks

Declare variables

Variable declaration defines the connecting points of the function

block. There are tabs for these types of variables.

Valid data types for variables are: BOOL, BYTE, DINT, DWORD, INT,

LREAL, REAL, SINT, TIME, UDINT, UINT, USINT, WORD. The default

type is BOOL.

The controller handles REAL values as float values and LREAL values

as double values.

To declare a variable, choose the tab for the type of variable from the

user-defined FBD editor. Right-click in any blank area and choose

New Variable.

Use this tab To define

VAR an internal variable without type limitations.

You can also define the attribute:

CONST a constant value that cannot be changed by logic

VAR_INPUT an input variable, which is also displayed on the block.

VAR_OUTPUT an output variable, which is also displayed on the block.

VAR_EXTERNAL

a global variable that can also be used and edited within

function blocks or functions. Value changes are also visible

to the outside.

ACTION an action block.

Action blocks describe what action should be performed and

which behavior should trigger it.

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Rockwell-automation 1753-PCS-PAR Using RSLogix Guard PLUS! with GuardP Instrukcja Użytkownika Strona 90