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n
In an
information model
, the content of the address space of the
OPC UA
server is
described.
n
The
Information models
are structured in layers. Each higher-order type is based on
certain basic rules. Thus, clients who only know the basic rules can still edit complex
information models, e.g. navigate through the
address space
and read or write data
variables.
n
In the
address space
, all information is represented by
Nodes
, which are intercon-
nected via
references
.
n
A node is always an instance of a
NodeClass
.
n
OPC UA
offers basic services such as data exchange or navigation through the
address space. The services are grouped in
Service Sets
.
The following
NodeClasses
are defined in the
OPC UA
specification:
n
Variable - class of variables
n
Method - class of functions
n
Object - class of objects
n
View - Class of view of a subset of nodes
n
DataType - Class of the data types of the value of a variable
n
VariableType - Class of the data types of a variable
n
ObjectType - class of object types
n
ReferenceType - class of reference types
Each
node
consists of attributes and references. Some attributes may also be optional.
The following attributes of each
NodeClass
must be published:
n
NodeID - Unique identifier of a
nodes
in the
address space
n
NodeClass - class of
node
instance
n
BrowseName - name of the
node
in plain text
n
DisplayName - display name of the
Node
for the user
n
Description - Description of the
node
(optional)
n
OPC UA
services are abstract descriptions defined by request and response mes-
sages.
n
The available services of an
OPC UA
server are defined in the server profile and
grouped together in service sets.
n
Discovery Service Set
–
Services for discovering existing servers and endpoints.
n
SecureChannel Service Set
–
Services for opening and closing secure communication channels.
n
Session Service Set
–
Services for the client to create and manage a session.
n
NodeManagement Service Set
–
Services for creating and deleting nodes and references.
n
View Service Set
–
Services for the client to navigate in the address space or in the view.
n
Query Service Set
–
Services for search queries in the address space.
n
Attribute Service Set
–
Services for accessing attributes of nodes.
n
Method Service Set
–
Service for calling a method of an object.
Node classes
Node attributes
OPC UA services
Basic service sets
VIPA System SLIO
Deployment OPC UA
Basics OPC UA > Information modeling
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