Rockwell Automation 1746-BAS BASIC LANGUAGE - Manual (Page 233)

Publication 1746-RM001A-US-P
Input Functions 13-43
LD@
Purpose
Use the LD@ statement to retrieve floating point numbers that were stored with a
ST@ statement. The expression [expr] following the LD@ statement specifies the
address where the number is stored after executing the LD@. The LD@ statement
places the number on the ARGUMENT STACK at the address location specified
by [expr].
This statement can be used with CALL 77 to retrieve variables from a protected
area of memory. This protected area is not zeroed on powerup or when the RUN
command is issued.
Syntax
LD@ [expr]
Example
>P. MTOP
24515
P. 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 9
>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 9
>90 LD@ 5FFFH–I*6
>100 POP B(I) : REM GET NUMBER FROM STACK
>110 PRINT B(I)
>120 NEXT I0
IMPORTANT
This instruction is not associated with any port designation.
IMPORTANT
LD@ is not used with any port designation.