Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 129)

100

101

Chapter

Expressions, Variables and Operators

9 -19

XBY

Use the XBY operator to retrieve or assign data to or from the external

RAM data memory of the BASIC module. The argument for the XBY

operator must be a valid integer between 0 and 65535 (0FFFFH).

The value assigned to the XBY operator must between 0 and 65535 (0 and

0FFFFH) inclusive. If not, a bad argument error occurs.

= XBY(0F000H)

Result: Value in external memory location 0F00H assigned to

variable A.

>XBY(4000H)

= 1F

Result: Value 1FH assigned to external memory location 4000H.

Important: Improper use of this operator may cause a malfunction of the

BASIC module.

TIME

Use the TIME operator to retrieve or assign a value to the free running

clock resident in the BASIC module. After reset, time is equal to 0.

CLOCK1 (page 11 -5) enables the free running clock. When you enable

the free running clock, the special function operator TIME increments once

every 5 milliseconds. The units of time are in seconds.

When you assign TIME a value with a LET statement (page 11 -19)

(ex:

TIME=100), only the integer portion of TIME is changed.

>CLOCK1

:REM ENABLE FREE RUNNING CLOCK

CLOCK0 :REM DISABLE FREE RUNNING CLOCK–TIME NOT RESET

PRINT TIME REM: DISPLAY TIME

READY

>RUN

3.315

>NEW

TIME = 0 :REM SET TIME = 0

PRINT TIME :REM DISPLAY TIME

READY

RUN

.315

(Note: only the integer is changed)

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