OPC UA Glossary

Address Space
collection of information that an OPC UA Server makes visible to its Clients
Attribute
data element of Node which can be read and written by a Client
BrowseName
attribute of Node contains its human-readable name
Communication Stack
layered set of software modules between the application and the hardware that provides various functions to encode, encrypt and format a Message for sending, and to decode, decrypt and unpack a Message that was received
Endpoint
physical address available on a network that allows Clients to access one or more Services provided by a Server
Discovery
mechanism which allows OPC UA Clients to find OPC UA Servers on the network
DiscoveryUrl
a URL for a network Endpoint that provides the information required to connect to a Server
Information Model
organizational framework that defines, characterizes and relates information resources of a given system or set of systems.
Method
callable software function that is a component of an Object
Node
fundamental component of an Address Space
Object
Node that represents a physical or abstract element of a system
ObjectType
Node that represents the type definition for an Object
Reference
explicit relationship (a named pointer) from one Node to another
Secure Channel
a long-term logical connection between a single client and a single server on Communication Stack’s level
Service
client-callable operation in an OPC UA Server
Session
a long-term logical connection between a single client and a single server on OPC UA application level
Variable
Node that contains a value