Industrial Communication Systems

57-6 Industrial Communication Systems

References are used to relate Nodes to each other. ey can be accessed using the browsing and

querying

services.

Like

Attributes,

they

are

dened

as

fundamental

components

of

Nodes.

Unlike

Attributes,

References

are

dened

as

instances

of

ReferenceType Nodes.

ReferenceType

Nodes

are

visible

in

the AddressSpace and are dened using the ReferenceType NodeClass.

e

Node

that

contains

the

Reference

is

referred

to

as

the

SourceNode

and

the

node

that

is

referenced

is

referred

to

as

the

TargetNode

(see

Figure

57.9).

e

combination

of

the

SourceNode,

the

ReferenceType,

TargetNode

SourceNode

Attributes

x

y

z

ReferenceName ...