Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 190)

100

101

Chapter

Statements

11 -38

Important: Define strings in your program first, unless you are executing

a CALL 77 (page 13 -6). Then, execute the CALL 77 first and define your

strings immediately after. The BASIC module executes the equivalent of a

CLEAR every time you execute the STRING statement. This is necessary

because string variables and numeric variables occupy the same external

memory space. After the STRING statement executes, all variables and

arrays are wiped out. Therefore perform string memory allocation early in

a program (in the first statement if possible). If you re-allocate string

memory you destroy all defined variables.

Important: The STRING statement turns off ONERR, CALL 38 and

ONTIME. Make sure that the STRING statement is executed before the

statements that enable interrupts.

Syntax

STRING

expr, expr

Example

10 STRING 100,30

20 $(0) = “–––––MONTHLY REPORT–––––”

30 PRINT $(0)

READY

RUN

–––––MONTHLY REPORT–––––

Call Routines

0–68

Tip

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