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       OPC Data Access Specification

 

 

OPC DA(OPC Data Access) is the oldest OPC Foundation specification. It defines an interface between clients and servers for real-time data access.

 

OPC DA consists of four basic objects: OPC Server, OPC Client, OPC Group and OPC Item.

 

There are five important concepts regarding OPC DA Specification:

 

bullet OPC Item

 

bullet OPC Group

 

bullet OPC Server

 

bullet OPC Client

 

bullet The Namespace

 

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