Rockwell-automation 1746-BAS BASIC LANGUAGE User Manual download pdf (Page 77)

1 Publication 1746-RM001A-US-P

Chapter

Assignment Functions

This chapter describes and illustrates commands that assign storage, reset data

storage, and values to variables within the BASIC program or from the command

line. Table 6.1 lists the corresponding mnemonics.

CLEAR

Purpose

Use the CLEAR statement to set all variables equal to 0 and reset 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 with the ONERR statement also does

not occur until an ONERR [ln num] statement is executed.

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

CLOCK1 statement. CLOCK0 is the only module statement that can disable the

free running clock.

CLEAR also does not reset the memory that has been allocated for strings, so it is

not necessary to enter the STRING [exp], [expr] statement to re-allocate memory

for strings after the CLEAR statement is executed. In general, CLEAR is used to

erase all variables.

Syntax

CLEAR

Table 6.1 Chapter Reference Guide

If you need (to) Use this mnemonic Page

Clear variables, interrupts & strings. CLEAR 6-1

Clear interrupts. CLEARI 6-3

Clear all stacks. CLEARS 6-3

Data read by Read statement. DATA 6-4

Allocate memory for array variables. DIM 6-4

Assign a variable or a string a value (LET is optional). LET 6-5

RESTORE read pointer. RESTORE 6-7

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Rockwell-automation 1746-BAS BASIC LANGUAGE User Manual Page 77