Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario descargar pdf (Pagina 46)

Operating Functions

Chapter 5

5–9

Action taken: When you enter NEW(cr), the BASIC Module deletes

the program that is currently stored in RAM memory. In addition, all

variables are set equal to ZERO, all strings and all BASIC evoked

interrupts are cleared. The REAL TIME CLOCK, string allocation, and

the internal stack pointer values are not affected. In general, NEW (cr) is

used to erase a program and all variables.

Action taken: The NULL[integer] command determines how many

NULL characters (00H) the BASIC Module outputs after a carriage

return. After initialization NULL 0. Most printers contain a RAM

buffer that eliminates the need to output NULL characters after a carriage

return.

Action taken: This command stops execution of the current program and

returns the BASIC Module to the COMMAND mode. In some cases

you can continue execution using a CONTinue. See the explanation

for CONTinue for more information.

5.3.7.1

Command: Disabling Control C

Action taken: This command disables the Control C break function.

You can do this by setting bit 48 (30H) to 1. Bit 48 is located in

internal memory location 38 (26H). Set bit 48 by executing the following

statement in a BASIC Module program or from the command mode:

DBY(38) DBY(38).OR.01H

When bit 48 is set to 1, the Control C break function for both LIST and

RUN operations is disabled. Cycling power returns Control C to normal

operation if it is disabled from the command mode.

To re-enable the Control C function, execute the following statement in a

BASIC Module program or from the command mode.

DBY(38) DBY(38).AND.0FEH

CALL routines do not check for this feature. If you enter a Control C

while using a CALL routine, the program stops if Control C is enabled or

disabled.

5.3.5

Command: NEW

5.3.6

Command: NULL [integer]

5.3.7

Command: Control C

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Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario Pagina 46