OPC UA Specification Part1 OverView and Concepts
Release 1.02 5 OPC Unified Architecture, Part 1 existence of some condition, and (2) for which the Server sends Notifications to the Client when the condition is detected.
3.1.33 Variable
A Variable is a Node that contains a value.
3.1.34 View
A specific subset of the AddressSpace that is of interest to the Client.
3.2 Abbreviations and symbols
A&E Alarms and Events
API Application Programming Interface
COM Component Object Model
DA Data Access
DCS Distributed Control System
DX Data Exchange
HDA Historical Data Access
HMI Human-Machine Interface
LDAP Lightweight Directory Access Protocol
MES Manufacturing Execution System
OPC OPC Foundation (a non-profit industry association)
PLC Programmable Logic Controller
SCADA Supervisory Control And Data Acquisition
SOAP Simple Object Access Protocol
UA Unified Architecture
UDDI Universal Description, Discovery and Integration
UML Unified Modelling Language
WSDL Web Services Definition Language
XML Extensible Mark-up Language