Rockwell-automation 2708-NBD VBASIC Language Development Kit Manual de usuario descargar pdf (Pagina 66)

A-B VBASIC and Visual BASIC

Appendix B

Differences Between

B–18

SUB GetName (Name$)

CLS

LINE INPUT “Enter your name: “;Name$

PRINT Name$;“Correct? “;

LINE INPUT; YN$

YN$ = UCASE$(YN$)

YN$ = “Y” or YN$ = “” THEN EXIT DO

LOOP

END SUB

SWAP vari1,vari2

Exchanges the values of two variables. See VBDOS manual for specific

details. Versions 1.0/1.1 of DH5 firmware do not support swapping single or

double precision variables. This will be corrected by future versions.

A$ = “1234”

B$ = “4321”

SWAP A$, B$ ‘A$ = “4321”, B$ = “1234”

SYSTEM

Terminates program execution. END, STOP, and SYSTEM as well as

“reaching the bottom” of a A-B VBASIC program all have the same result:

the program is terminated. Program termination causes the following:

1. Files are left unchanged. In particular, if HOST was OPEN, it remains

OPEN;

2. Status Display #8 and the corresponding read–only menu display show

“End by System”, and the offset in the program where the termination

occurred;

3. An error: “BASIC ERROR: End by System” is transmitted to the HOST;

Any “End by System” error message with an offset of 0 (zero) is serious and

should be reported.

TIME$

Returns the current time from the operating system. An 8 byte string is

returned in the form hhmmssnn, representing hours(0–23), minutes, seconds,

and hundredths of a second. (The Clock Mode setting of the Setup Menus

has no effect on the format of the TIME$ variable.)

CurrTime$ = TIME$

TIME$ = stringexpression

Sets the time. See preceding entry. This method of setting the actual time is

in addition to the Setup Menus and the Network Directives which allow the

host to set the time. See also DATE$.

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Rockwell-automation 2708-NBD VBASIC Language Development Kit Manual de usuario Pagina 66