Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 187)

100

101

Chapter

Statements

11 -35

Use the ST@ statement to store BASIC module floating point numbers to a

specified address. The expression following the ST@ statement specifies

the address where you want the number stored in RAM. The ST@

statement takes the value on the top of the argument stack and stores it in

RAM at the address location you specify by expr.

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

a protected area of memory. This protected area is not zeroed on power up

or when you issue the RUN command (page 10 -19). Use the LD@

statement (page 11 -18) to retrieve the floating point number you stored

with the ST@ statement.

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

Syntax

ST@

expr

Example

PRINT MTOP

24575

PRINT MTOP–10*6

24515

PUSH 24515 : CALL 77

PRINT MTOP

24515

1 REM EXAMPLE PROGRAM

5 DIM A(10),B(10)

10 REM *** ARRAY SAVE ***

20 FOR I = 0 TO 5

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 4

90 LD@ 5FFFH-I*6

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

110 PRINT B(I)

120 NEXT I

READY

RUN

READY

PUSH 5FFFH : CALL 77

PRINT MTOP

24575

ST@

1 2 ... 182 183 184 185 186 187 188 189 190 191 192 ... 393 394

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