Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario descargar pdf (Pagina 53)

Operating Functions

Chapter 5

5–16

The following sections list and describe the statements you can use

with the BASIC Module.

Mode: COMMAND AND/ OR RUN

Type: CONTROL

You use the CALL [integer] statement to call specially written BASIC

Module application programs. Specific call numbers are defined later

in this chapter.

Mode: COMMAND AND/OR RUN

Type: CONTROL

The CLEAR statement sets all variables equal to 0 and resets all

BASIC evoked interrupts and stacks. This means that after the CLEAR

statement is executed an ONTIME statement must be executed before the

module acknowledges the internal timer interrupts. ERROR trapping

using the ONE RR statement also does not occur until an

ONERR[integer] statement is executed. The CLEAR statement does

not affect the real time clock that is enabled by the CLOCK1

statement. CLEAR also does not reset the memory that has been

allocated for strings, so it is not necessary to enter the STRING

[expr], [expr] statement to re-allocate memory for strings after the

CLEAR statement is executed. In general, CLEAR is used to

“erase” all variables.

Mode: COMMAND AND/OR RUN

Type: CONTROL

The CLEARI statement clears all of the BASIC evoked interrupts. The

ONTIME interrupt disables after the CLEARI statement executes.

CLEARI does not affect the real time clock enabled by the CLOCK1

statement. You can use this statement to selectively DISABLE

ONTIME interrupts during specific sections of your BASIC program.

You must execute the ONTIME statement again before the specific

interrupts enable.

Important: When the CLEARI statement is LISTED it appears as

CLEAR I.

5.4

Description of Statements

5.4.1

Statement: CALL [integer]

5.4.2

Statement: CLEAR

5.4.3

Statement: CLEARI

(clear interrupts)

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 166 167

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