Rockwell Automation 1746-BAS BASIC LANGUAGE - Manual (Page 235)

Publication 1746-RM001A-US-P
Input Functions 13-45
READ Purpose
Use the READ statement to retrieve the expressions that are specified in the DATA
statement 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, they are separated by a comma.
Syntax
READ
Example
>1 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
>
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 considered chained
together and appear as one large DATA statement. If at anytime all the data is read
and another READ statement is executed, the program terminates and the message
ERROR: NO DATA - IN LINE XX prints to the console device.