Denso Power Net Terminal BHT-7500 Spécifications télécharger pdf (Page 207)

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Chapter 14. Statement Reference

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Syntax:

COMMON commonvariable[,commonvariable...]

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.

Description:

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 the common vari-

ables 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 6

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.

Declarative statement

COMMON

Declares common variables for sharing between user programs.

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