Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario descargar pdf (Pagina 62)

Operating Functions

Chapter 5

5–25

Unlike the RUN command the GOTO statement, if executed in the

COMMAND mode, does not clear the variable storage space or

interrupts. However, if the GOTO statement is executed in the

COMMAND mode after a line is edited the module clears the variable

storage space and all BASIC evoked interrupts. This is necessary

because the variable storage and the BASIC program reside in the same

RAM memory. Because of this editing a program can destroy variables.

Mode: RUN

Type: CONTROL

The value of the expression following the ON statement is the

number in the line list that control is transferred to.

Example:

u10 ON Q GOTO 100,200,300

If Q is equal to 0, control is transferred to line number 100. If Q is

equal to 1, control is transferred to line number 200. If Q is equal to 2,

GOTO line 300, etc. All comments that apply to GOTO and GOSUB

apply to the ON statement. If Q is less than ZERO a BAD

ARGUMENT ERROR is generated. If Q is greater than the line

number list following the GOTO or GOSUB statement, a BAD

SYNTAX ERROR is generated. The ON statement provides

“conditional branching” options within the constructs of a BASIC

Module program.

Mode: RUN

Type: CONTROL

The IF statement sets up a conditional test. The general form of the IF –

THEN – ELSE statement follows:

[ln num] IF [rel expr] THEN valid statement ELSE valid

statement

Example:

u10 IF A=100 THEN A=0 ELSE A=A+1

5.4.13

Statement: GOTO [ln num]

(continued)

5.4.14

Statements: ON [expr] GOTO

[ln num], [ln num],...[ln num],

ON [expr] GOSUB[ln num],

[ln num],...[ln num]

5.4.15

Statements: IF – THEN –

ELSE

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 166 167

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