Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 170)

100

101

Chapter

Statements

11 -18

Use the LD@ statement to retrieve floating point numbers stored with a

ST@ statement (page 11 -35). The expression following the LD@

statement specifies the address where you want to store the number after

executing the LD@. The LD@ statement places the number on the

argument stack at the address location you specify with expr.

You can use this statement with CALL 77 (page 13 -6) to retrieve variables

from a protected area of memory. This protected area is not zeroed on

power up or when you issue the RUN command (page 10 -19).

Important: LD@ and ST@ are not used with any port designation.

Syntax

LD@

expr

Example

PRINT MTOP

24515

PRINT MTOP 10*6

24455

PUSH 24455 : CALL 77

1 REM EXAMPLE PROGRAM

5 DIM A(10),B(10)

10 REM *** ARRAY SAVE ***

20 FOR I = 0 TO 3

30 A(I) = I+20

40 PUSH A(I) : REM PUT NUMBER ON STACK

50 ST@ 5FFFH-I*6

60 NEXT I

70 REM *** GET ARRAY ***

80 FOR I = 0 TO 3

90 LD@ 5FFFH-I*6

100 POP B(I) : REM GET NUMBER FROM STACK

110 PRINT B(I)

120 NEXT I0

READY

>RUN

READY

PUSH 5FFFH : CALL 77

PTINT MTOP

24575

LD@

1 2 ... 165 166 167 168 169 170 171 172 173 174 175 ... 393 394

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