Introduction | OPC Technology | OPC Specifications
OPC Data Access Specification | DCOM Configuration | References

OPC Data Access Specification

OPC Item | OPC Group | OPC Server | OPC Client | The Namespace

OPC Item

OPC Item represents data connections to items, nodes or every monitored property in the Namespace.

Each item can be from different OPC Specification compatible datatypes. There are two different access type: writable or read-only. The active state can be defined too.

All access to an OPC Item is made by an OPC Group, so it is impossible to a client to access it.