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OPC Data Access (OPC DA) 3.00 Specification

OPC is a series of standards specifications. The first standard (originally called simply the OPC Specification and now called the Data Access Specification) resulted from the collaboration of a number of leading worldwide automation suppliers working in cooperation with Microsoft. Originally based on Microsoft's OLE COM (component object model) and DCOM (distributed component object model) technologies, the specification defined a standard set of objects, interfaces and methods for use in process control and manufacturing automation applications to facilitate interoperability. The COM/DCOM technologies provided the framework for software products to be developed. There are now hundreds of OPC Data Access servers and clients.

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Details:
Specifications (7,138 kb , PDF)
Author: OPC Foundation

Description:
This specification is intended as reference material for developers of OPC compliant Clients and Servers. It is assumed that the reader is familiar with Microsoft OLE/COM technology and the needs of the Process Control industry. This specification is intended to facilitate development of OPC Servers in C and C++, and of OPC client applications in the language of choice. Therefore, the developer of the respective component is expected to be fluent in the technology required for the specific component.