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] …

Aug 6, 2019 · OPC UA is not only for OPC-DA, but for all OPC Classic (DA, AE, HDA, etc). OPC Classic uses DCOM communication for Client-Server connection. DCOM is for Windows OS.

Apr 12, 2024 · OPC DA (Data Access) is a protocol standard introduced earliest by the OPC Foundation, mainly used for accessing and exchanging real-time data. It is built on Microsoft's COM/DCOM technology, providing an industrial automation system with a standardized communication interface.

Sep 14, 2021 · OPC is the one universally accepted standard for exchanging data between different industrial automation systems. How does OPC DA work? The following diagram shows a typical OPC DA configuration.

You may have also heard about OPC XML-DA, OPC Security, OPC commands, & OPC batch. All of these were standards to address specific types of problems, but none were as widely adopted as OPC DA, A&E, and HDA. As a collection, these …

The OPC DA specification defines the exchange of data including values, time and quality information. The OPC A&E specification defines the exchange of alarm and event type message information, as well as variable states and state management.

OPC DA (Data Access) is the most common standard which describes a set of functions for real-time data exchange with PLC, DCS, HMI, CNC and other devices. OPC HDA (Historical Data Access) provides access to already saved data and history.

OPC DA stands for OPC Data Access. It is an OPC Foundation specification that defines how real-time data can be transferred between a data source and a data sink (for example: a PLC and an HMI) without either of them having to know each other’s native protocol.

What is OPC DA? OPC DA (Open Platform Communications Data Access) is a standardized interface for access to process data. It is based on the Microsoft standard COM/DCOM2 (Component Object Model / Distributed COM) that has been extended due to the requirements of data access in automation, where the interface is used to read data from or write ...

OPC Data Access (OPC DA) provides access to real time automation data. Using OPC DA, software applications can retrieve real-time data to enable them to monitor a given process. In that scenario, OPC DA is used for data acquisition.