Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario descargar pdf (Pagina 66)

Operating Functions

Chapter 5

5–29

Mode: COMMAND AND/OR RUN

Type: ASSIGNMENT

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

expression. The general form of LET is:

LET [var] = [expr]

Examples:

LET A =10*SIN(B)/100 or

LET A = A+1

Note that the = sign used in the LET statement is not an equality

operator. It is a “replacement” operator. The statement should be read

A is replaced by A plus one. The word LET is always optional, (i.e.

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 the string variables:

LET $(1)=“THIS IS A STRING” or

LET $(2)=$(1)

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

[expr] statement or else a MEMORY ALLOCATION ERROR occurs.

See the following section 5.4.31 titled, “STRING”.

5.4.18

Statement: LET

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Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario Pagina 66