Denso BHT-200QW Especificações descarregar pdf (Página 178)

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Declarative statement

COMMON

Declares common variables for sharing between user programs.

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Syntax:

Syntax:Syntax:

Syntax:

COMMON commonvariable[,commonvariable...]

Parameter:

Parameter:Parameter:

Parameter:

commonvariable

A non-array integer variable, a non-array real variable, a non-array string variable, an

array integer variable, an array real variable, or an array string variable.

Desc

DescDesc

Description:

ription:ription:

ription:

COMMON defines common variables for sharing them when one program chains to another.

• Common variables defined by COMMON keep effective as long as programs chained by

the CHAIN statement are running.

• A COMMON statement can appear anywhere in a source program.

• All of the variable name, type, quantity, and definition order of common variables used

in the current program should be identical with those in the chained-to programs. If not,

variables having indefinite values will be passed.

• Up to two-dimensional array variables can be defined. You can specify a sub-script

ranging from 0 to 254 for an array variable.

• The total variable data size which can be passed between chained programs is 32

kilobytes including work variables.

• The size of an array data is equal to the element size multiplied by the number of

elements.

• You can specify the maximum string length within the range from 1 to 255 to a string

variable.

• The default length of a non-array string variable is 40.

• The default length of an array string variable is 20.

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