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The OPC Data Access Specification is the first of a group of specifications known as the OPC Classic Specifications. [1]OPC Data Access is a group of client–server standards that provides specifications for communicating real-time data from data acquisition devices such as PLCs to display and interface devices like Human–Machine Interfaces (HMI), SCADA systems [2] and also ERP/MES systems. [3]
OPC Unified Architecture ( OPC UA) is a cross-platform, open-source, IEC62541 standard for data exchange from sensors to cloud applications developed by the OPC Foundation. Distinguishing characteristics are: [ 1] Standardized data models freely available for over 60 types of industrial equipment, published by the OPC Foundation via Companion ...
Open Platform Communications. Open Platform Communications ( OPC) is a series of standards and specifications for industrial telecommunication. They are based on Object Linking and Embedding (OLE) for process control . An industrial automation task force developed the original standard in 1996 under the name OLE for Process Control.
Software using such a license is free software (or free and open-source software) as conferred by the copyright holder. Free-software licenses are applied to software in source code and also binary object-code form, as the copyright law recognizes both forms.
For information on software-related licences, see Comparison of free and open-source software licenses. A variety of free-content licences exist, some of them tailored to a specific purpose. Also listed are open-hardware licences, which may be used on design documents of and custom-made software for open-source hardware.
ECMA-376, ISO/IEC 29500-2:2021. The Open Packaging Conventions (OPC) is a container-file technology initially created by Microsoft to store a combination of XML and non-XML files that together form a single entity such as an Open XML Paper Specification (OpenXPS) document. OPC-based file formats combine the advantages of leaving the independent ...
OPC Historical Data Access, also known as OPC HDA, is used to exchange archived process data. This is in contrast to the OPC Data Access (OPC DA) specification that deals with real-time data. OPC technology is based on client / server architecture. Therefore, an OPC client, such as a trending application or spreadsheet, can retrieve data from ...
"Free and open-source software" (FOSS) is an umbrella term for software that is simultaneously considered both free software and open-source software. [5] The precise definition of the terms "free software" and "open-source software" applies them to any software distributed under terms that allow users to use, modify, and redistribute said software in any manner they see fit, without requiring ...