Rockwell-automation 2708-NBD VBASIC Language Development Kit User Manual download pdf (Page 57)

A-B VBASIC and Visual BASIC

Appendix B

Differences Between

B–9

END IF

LOOP

UpdateTime:

LOCATE 1, 1, 0

PRINT LEFT$(CurrTime$,2); “:”; RIGHT$(CurrTime$,2);

RETURN

GOTO {linelabel/linenumber}

Branches unconditionally to the specified line. See VBDOS manual for

detailed information.

HEX$(expression)

Returns a string that represents the hexadecimal argument expression. See

VBDOS manual for detailed information.

IF...THEN...ELSE

Allows conditional execution, based on the evaluation of a Boolean

expression. See VBDOS manual for detailed information.

IF (A > B) AND (C > D) THEN

Sum = (A – B) + C

ELSEIF (A < B) AND (C < D) THEN

Sum = (B – A) * D

ELSE

Sum = A * C

END IF

INKEY$

Reads a character from the keyboard. If no key is currently being pressed, it

returns a null string. All key codes in a DH5 terminal are a single byte. The

codes corresponding to special keys can vary due to differences in keypad

configurations. If necessary, use this function to get a keystroke, convert it

using ASC, then print the result.

A$ = “”

DO WHILE A$ = “”

A$ = INKEY$

LOOP

INPUT$(bytecount[,[#]filenumber])

Returns a string read from the specified file. A common error is switching

the byte count and the filenumber. To prevent this, always use the # symbol

with the filenumber even though it’s optional. See the chapter on Special

Devices for details on INPUT$ from particular devices.

J$ = INPUT$(LOC(1),#1)

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Rockwell-automation 2708-NBD VBASIC Language Development Kit User Manual Page 57