Rockwell-automation 1771-DB BASIC MODULE Instrukcja Użytkownika Pobierz pdf (Strona 183)

100

101

Chapter

Statements

11 -31

Use the READ statement to retrieve the expressions that you specified in

the DATA statement (page 11 -6) and assign the value of the expression to

the variable in the READ statement. The READ statement is always

followed by one or more variables. If more than one variable follows a

READ statement, separate them by a comma.

Every time a READ statement is encountered the next consecutive

expression in the DATA statement is evaluated and assigned to the variable

in the READ statement. You can place DATA statements anywhere within

a program. They are not executed and do not cause an error.

DATA statements are chained together and appear as one large DATA

statement. If at anytime all the data is read and you execute another READ

statement, the program terminates and the message

ERROR:

NO DATA –

IN LINE XX

prints to the console device.

See also the DATA (page 11 -6) and RESTORE (page 11 -32) statements.

Syntax

READ

Example

REM EXAMPLE PROGRAM

10 FOR I = 1 TO 3

20 READ A,C

30 PRINT A,C

40 NEXT I

50 RESTORE

60 READ A,C

70 PRINT A,C

80 DATA 10,20,10/2,20/2,SIN(PI),COS(PI)

READY

>RUN

10 20

5 10

0 –1

10 20

READY

READ

1 2 ... 178 179 180 181 182 183 184 185 186 187 188 ... 393 394

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