Rockwell-automation 57C610 Enhanced Basic Language, AutoMax Manual de usuario descargar pdf (Pagina 46)

6Ć6

6.3 Variable Assignment

(LET/SET_MAGNITUDE)

There are two formats for assigning a value to a variable: the LET

statement and the SET_MAGNITUDE statement. TheLET" in an

assignment is optional. In actuality tasks are more readable without

LET" in front of the assignment. Its use is left to the discretion of the

programmer.

The following is the LET statement format:

LET variable = expression

where:

variable = simple (A%) or subscripted [A%(5)]; variable of

any data type.

expression = can be as simple as a constant or as involved

as a complex arithmetic expression. (See

section 5.0).

The following are valid LET statements:

10 LET SPEED%=25

15 LET MESSAGE$=SYSTEM FAILURE"

95 WINDER_EMPTY@=TRUE

25 GAIN_CHANGE!=GAIN%*13

A% = B% + C% - (D% / 234) + 15 -F%

TENSION = TENSION - ((19.7765 * &

GAIN%)/78 - 12.3) + OLD_REFERENCE

The following are invalid LET statements:

10 LET =

ĂA% (no variable specified on the left side of the

Ăequal sign)

10 LET A%Ă=

THIS IS A MES

SAGE" (a string value cannot

be assigned to an integer variable)

10 LET A% = 6+22-(B%-34)+(missing term)

(Invalid

expression)

The purpose of the SET_MAGNITUDE statement is to allow the

programmer to enter 16Ćbit hexadecimal values without having to

worry about sign extending the numbers into a 32Ćbit form. The

following is the SET_MAGNITUDE statement format:

SET_MAGNITUDE (variable, value)

where:

variable = a numeric simple variable (integer, double

integer) (not an array)

value =

a numeric constant or expression of same type

as variable

If the variable specified in the statement is a single integer variable,

the value loaded will be only the lower 16Ćbits of the value field with

no sign extension:

10 SET_MAGNITUDE(A%,0FFFFH)

(A% is replaced by 0FFFFH)

10 SET_MAGNITUDE(A%,0C249H OR 1234H)

(A% is replaced by 0D23DH)

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