Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 262)

100

101

Chapter

Call Routines 69–127

13 -4

Use this routine to return to the routine that called this ROM/RAM routine.

Execution begins on the line after the line that called the ROM/RAM

routine. This routine works one layer deep. You may go back to the last

called program’s next line.

Important: There must be a next line in the ROM or RAM routine,

otherwise unpredictable events could occur that may destroy the contents

of RAM. For this reason always be sure that at least one END statement

exists following a CALL 70 or 71.

Input and Output Arguments

This routine has no input or output arguments.

Syntax

CALL

Example

ROM 1

10 REM SAMPLE PROG FOR CALL 72

20 PRINT “NOW EXECUTING ROM #1

30 PUSH 3

40 CALL 71 : REM EXECUTE ROM #3 THEN RETURN

50 PRINT “EXECUTING ROM #1 AGAIN”

60 END

ROM 3

10 REM THIS LINE WONT BE EXECUTED

20 PRINT “NOW EXECUTING ROM #3”

30 CALL 72

40 END

With ROM #1 selected:

>RUN

NOW

EXECUTING ROM #1

NOW EXECUTING ROM #3

EXECUTING ROM #1 AGAIN

READY

CALL 72: RAM/ROM Return

1 2 ... 257 258 259 260 261 262 263 264 265 266 267 ... 393 394

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