Rockwell-automation 1771-DB BASIC MODULE Manuel d'utilisateur télécharger pdf (Page 171)

100

101

Chapter

Statements

11 -19

Use the LET statement to assign a variable to the value of an expression.

The = sign used in the LET statement is not an equality operator. It is a

replacement operator. The statement should be read var is replaced expr.

The word LET is always optional (ex.

LET A = 2

is the same as A

= 2

When LET is omitted the LET statement is called an IMPLIED LET.

We use the word LET to refer to both the LET statement and the IMPLIED

LET statement.

Also use the LET statement to assign string variables:

LET

$(1)=“THIS IS A STRING”

LET $(2)=$(1)

Before you can assign strings you must execute the STRING expr, expr

statement (page 11 -37) or else a memory allocation error occurs that

causes the module to enter the Command mode.

Syntax

LET

var

expr

Example

1 REM EXAMPLE PROGRAM

10 LET A = 10*SIN(C)/100

20 LET B = B +1

LET

1 2 ... 166 167 168 169 170 171 172 173 174 175 176 ... 393 394

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