Denso Power Net Terminal BHT-7500 Specifikace stáhnout pdf (Strana 133)

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In the example below, the character "A" may be entered with the alphabet entry function

or may be generated by pressing the F1 key which has been assigned that character by

the

KEY statement. The user program, however, cannot distinguish between them so

as to transfer control to the program step labelled

FUNC1 in both cases.

K$=INPUT$ (1)

IF K$="A" THEN GOTO FUNC1 ENDIF

To prevent such a problem, assign any other character to the F1 key with the KEY

statement and then modify the judgement condition. For example, replace the charac-

ter assigned to the F1 key with the character "#", as shown below.

KEY 1, "#"

K$=INPUT$ (1)

IF K$="#" THEN GOTO FUNC1 ENDIF

For details, refer to Chapter 14, KEY and ON KEY statements.

Note that the alphabet entry function does not influence the keystroke trapping which

identifies keys according to their key numbers.

■

Alphabet Entry Example

Coding in a user program:

OUT 5,1 ’Activating the alphabet

’entry function

INPUT "data=";a$ ’Waiting for keystrokes

Entering alphabet characters "ND" under the above user program:

1) Press the trigger switch.

1 2 ... 128 129 130 131 132 133 134 135 136 137 138 ... 559 560

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