Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario descargar pdf (Pagina 61)

Operating Functions

Chapter 5

5–24

RETURN

Use this statement to “return” control to the statement following the

most recently executed GO SUB STATEMENT. Use one return for each

GOSUB to avoid overflowing the C-STACK. This means that a

subroutine called by the GO SUB statement can call another

subroutine with another GOSUB statement.

Examples:

SIMPLE SUBROUTINE NESTED SUBROUTINES

u10 FOR I=1 TO 5 u10 FOR I=1 TO 3

u20 GOSUB 100 u20 GOSUB 100

u30 NEXT I u30 NEXT I

u40 END u40 END

u100 PRINT I u100 REM USER SUBROUTINE HERE

u110 RETURN u105 PRINT I,

uRUN u110 GOSUB 200

1 u200 PRINT I,I*I

2 u210 RETURN

3 uRUN

511

READY 3 9

READY

Mode: COMMAND AND/OR RUN

Type: CONTROL

The GOTO [ln num] statement causes BASIC to transfer control directly

to the line number ([ln num]) following the GOTO statement.

Example:

u50 GOTO 100

If line 100 exists, this statement causes execution of the program to

resume at line 100. If line number 100 does not exist the message ERROR:

INVALID LINE NUMBER is printed to the console device.

5.4.12

Statements: GOSUB [ln num]

– RETURN (continued)

5.4.13

Statement: GOTO [ln num]

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 166 167

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Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario Pagina 61