Rockwell-automation 57C610 Enhanced Basic Language, AutoMax Instrukcja Użytkownika Pobierz pdf (Strona 41)

6Ć1

6.0 AutoMax ENHANCED BASIC

STATEMENT TYPES

As described in section 3.1, each BASIC statement begins with a

line number followed by a keyword. The keyword determines what

information will follow on the line. This section describes all the

keywords used in AutoMax Enhanced BASIC grouped by statement

type as follows:

6.1

Defining V

ariable Control

6.2 Program Documentation

6.3 Variable Assignment

6.4 Transferring Program Control

6.5 Program Looping

6.6 Statements Used for MultiĆTasking Applications

6.7 RealĆTime Control

6.8 Communication

6.9 Error Handling

6.10 Including Other Files

6.11 Stopping Execution

The format of all statements is defined, along with the parameters

required and the permitted variable types. Parameters that are

optional are so noted.

6.1 Defining Variable Control

AutoMax Enhanced BASIC requires that all variables be defined in

the task, i.e., initialized, prior to their use in the task if they must be

at a known state other than 0. See section 4.1.3, Variable Control

Types, for more information about variable control and the initial

state of variables. Arrays must always be defined prior to their use.

Variables are defined using either a LOCAL or COMMON statement.

The storage area required for the variables is automatically set aside

by these two statements.

6.1.1 LOCAL

Statement

The

OCAL statement is used to define three kinds of variables, all

of which are local", or accessible to, only the task in which they are

defined. This means that even if the same variable name is used in

another task the values of the two variables are totally independent

of each other. Any operation performed within a task on the variable

has no effect on the variable in the other task. The following types of

variables are defined using the LOCAL statement:

1. Simple variables used only by the task. These variables can be

of any data type and can be written to or read from.

2. Subscripted (array) variables used only by the task. These

variables can be of any data type and can be written to or read

from.

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