Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario descargar pdf (Pagina 126)

Operating Functions

Chapter 5

5–89

The user is now executing ROM 4 if it exists. If the ROM routine

requested does not exist the result is:

PROGRAM NOT FOUND.

READY

This routine allows you to return to the ROM or RAM routine that called

this ROM or RAM routine. Execution begins on the line following the line

that CALLed the routine. No arguments are PUSHed or POPed. This

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

program’s next line.

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

otherwise unpredictable events could occur which 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.

Example:

uROM #1

u10 REM SAMPLE PROG FOR CALL 72

u20 PRINT “NOW EXECUTING ROM #1

u30 PUSH 3

u40 CALL 71 :REM EXECUTE ROM #3 THEN RETURN

u50 PRINT “EXECUTING ROM #1 AGAIN”

u60 END

ROM #3

u10 REM THIS LINE WONT BE EXECUTED

u20 PRINT “NOW EXECUTING ROM #3”

u30 CALL 72

u40 END

With ROM #1 selected:

uRUN

NOW EXECUTING ROM #1

NOW EXECUTING ROM #3

EXECUTING ROM #1 AGAIN

READY

5.11.2

ROM/RAM to ROM Program

Transfer – CALL 71

(continued)

5.1

1.3

RAM/ROM Return – CALL 72

1 2 ... 121 122 123 124 125 126 127 128 129 130 131 ... 166 167

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Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario Pagina 126