Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 154)

100

101

Chapter

Statements

11 -2

Use the CLEAR statement to set all variables equal to 0 and reset all

BASIC evoked interrupts and stacks. This means that after you execute the

CLEAR statement, you must execute an ONTIME statement (page 11 -25)

before the module acknowledges the internal timer interrupts. ERROR

trapping with the ONERR statement (page 11 -23) does not re-occur until

you execute an ONERR ln num statement.

The CLEAR statement does not affect the free running clock that is

enabled by the CLOCK1 statement (page 11 -5). CLOCK0 (page 11 -4)

is the only module statement that can disable the free running clock.

Nor does CLEAR reset the memory that has been allocated for strings, so

it is not necessary to re-enter the STRING expr, expr statement (page

11 -37) to re-allocate memory for strings after executing the CLEAR

statement. In general, use CLEAR to erase all variables.

You can also use CLEAR in Command mode.

Syntax

CLEAR

Example

>CLEAR

>LIST

1 REM EXAMPLE PROGRAM

10 DIM A(4)

20 DATA 10,20,30,40

30 FOR I=0 TO 3

40 READ A(I)

50 NEXT I

60 FOR J=O TO 3

70 PRINT A(J)

80 NEXT J

READY

PRINT A(1),I,J

0 0 0

>RUN

READY

PRINT A(1),I,J

20 4 4

>CLEAR

PRINT A(1),I,J

0 0 0

CLEAR

1 2 ... 149 150 151 152 153 154 155 156 157 158 159 ... 393 394

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