Opc data Access Automation Specification

2.3

 

OPC Data Access Automation Object Model 

The OPCServer object provides a way to access (read/write) or communicate to a set of data sources. The types of 

sources available are a function of the server implementation. 

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OPC Data Access Automation Specification2.02 

An OPC Automation client connects to an OPC Automation Server that communicates to the underlying data source 

(e.g. OPC Data Access Custom Servers) through the functionality provided by the automation objects described here.  

The OPCServer provides an (OPCGroups) automation collection object to maintain a collection of OPCGroup Objects.  

The OPCGroup object allows clients to organize the data they want to access. An OPCGroup can be activated and 

deactivated as a unit.  An OPCGroup also provides a way for the client to ‘subscribe’ to the list of items so that it can be 

notified when they change.  The OPCGroup Object provides an OPCItems collection of OPCItems. 

The OPCItem object provides a connection to a single data item in the underlying data source.