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<title>OPC Data Access</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">OPC Data Access</span></span>

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</style><table class="infobox vevent"><caption class="infobox-title summary">OPC Data Access (OPC DA)</caption><tbody><tr><th scope="row" class="infobox-label">International standard</th><td class="infobox-data">OPC DA specification</td></tr><tr><th scope="row" class="infobox-label">Developed by</th><td class="infobox-data"><a href="OPC_Foundation" title="OPC Foundation">OPC Foundation</a></td></tr><tr><th scope="row" class="infobox-label">Introduced</th><td class="infobox-data">August 1996<span style="display:none"> (<span class="bday dtstart published updated">1996-08</span>)</span></td></tr><tr><th scope="row" class="infobox-label">Industry</th><td class="infobox-data"><a href="Operational_technology" title="Operational technology">Operational technology</a> and <a href="Information_technology" title="Information technology">Information technology</a></td></tr><tr><th scope="row" class="infobox-label">Compatible hardware</th><td class="infobox-data"><a href="Windows" class="mw-redirect" title="Windows">Windows</a></td></tr><tr><th scope="row" class="infobox-label">Superseded by</th><td class="infobox-data"><a href="OPC_Unified_Architecture" title="OPC Unified Architecture">OPC Unified Architecture</a></td></tr><tr><th scope="row" class="infobox-label">Website</th><td class="infobox-data url"><a rel="nofollow" class="external free" href="https://opcfoundation.org/about/opc-technologies/opc-classic/">https://opcfoundation.org/about/opc-technologies/opc-classic/</a></td></tr></tbody></table>

<p>The <b>OPC Data Access</b> Specification is the first of a group of <a href="Specification_(technical_standard)" title="Specification (technical standard)">specifications</a> known as the <a href="OLE_for_process_control" class="mw-redirect" title="OLE for process control">OPC</a> Classic Specifications.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>

</p><p>OPC Data Access is a group of <a href="Client%E2%80%93server_model" title="Client–server model">client–server</a> standards that provides specifications for communicating real-time data from <a href="Data_acquisition" title="Data acquisition">data acquisition</a> devices such as <a href="Programmable_logic_controller" title="Programmable logic controller">PLCs</a> to display and interface devices like <a href="Human%E2%80%93machine_interface" class="mw-redirect" title="Human–machine interface">Human–Machine Interfaces</a> (HMI), <a href="SCADA" title="SCADA">SCADA</a> systems<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> and also <a href="Enterprise_resource_planning" title="Enterprise resource planning">ERP</a>/<a href="Manufacturing_execution_system" title="Manufacturing execution system">MES</a> systems.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> The specifications focus on the continuous communication of data.

</p><p>The OPC Data Access specification is also known as OPC DA. OPC DA deals only with real-time data and not historical data (for historical data you need to use <a href="OPC_Historical_Data_Access" title="OPC Historical Data Access">OPC Historical Data Access</a>, or OPC HDA) or events (for Alarms and Events you need to use OPC Alarms and Events, or OPC AE). There are three attributes associated with OPC DA data. These are

</p>

<ol><li>a value,</li>

<li>the <a href="Quality_(business)" title="Quality (business)">quality</a> of the value, and</li>

<li>a <a href="Timestamp" title="Timestamp">timestamp</a>.</li></ol>

<p>The OPC DA specification states that these three attributes have to be returned to an OPC client making a request. Therefore, if the data source is not capable of providing a timestamp, for example, the OPC DA server must create a timestamp.

</p><p>The OPC Classic specifications are based on the <a href="Microsoft" title="Microsoft">Microsoft</a> <a href="Component_Object_Model" title="Component Object Model">COM</a> technology<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> and define a <a href="C_language" class="mw-redirect" title="C language">C</a>/<a href="C%2B%2B" title="C++">C++</a> <a href="Interface_(computing)" title="Interface (computing)">interface</a>. A standard <a href="OLE_Automation" title="OLE Automation">Automation</a> <a href="Wrapper_library" title="Wrapper library">wrapper</a> interface is also defined for access from <a href="Visual_Basic" title="Visual Basic">Visual Basic</a>, <a href="Embarcadero_Delphi" class="mw-redirect" title="Embarcadero Delphi">Delphi</a> and other automation-enabled languages.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Several vendors offer <a href=".NET_Framework" title=".NET Framework">.NET</a> toolkits to make the OPC interface accessible in .NET <a href="Application_software" title="Application software">applications</a>.

</p><p>The newer OPC .NET (<a href="OPC_Xi" class="mw-redirect" title="OPC Xi">OPC Xi</a>) specification is based on WCF (<a href="Windows_Communication_Foundation" title="Windows Communication Foundation">Windows Communication Foundation</a>) and defines a .NET interface with the functionality of the OPC Classic specifications OPC DA, OPC HDA and OPC AE (Alarms&Events).<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup>

</p><p>The more recent <a href="OPC_Unified_Architecture" title="OPC Unified Architecture">OPC Unified Architecture</a> allows the same functionality but offers platform independence and optionally complex information modelling capabilities.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup>

</p>

<ul><li><a href="OPC_Foundation" title="OPC Foundation">OPC Foundation</a></li>

<li><a href="Distributed_Component_Object_Model" title="Distributed Component Object Model">Distributed Component Object Model</a></li>

<li><a href="OPC_Unified_Architecture" title="OPC Unified Architecture">OPC Unified Architecture</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://opcfoundation.org/developer-tools/specifications-classic/data-access/">"Members"</a>.</cite></span>

</li>

</li>

<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite id="CITEREFMahalik2013" class="citation book cs1">Mahalik, Nitaigour P. (2013-03-09). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=8Lj8CAAAQBAJ&q=ERP%2FMES%20%22OPC%20DA%22%20OR%20%22OPC%20Data%20Access%22&pg=PA352"><i>Fieldbus Technology: Industrial Network Standards for Real-Time Distributed Control</i></a>. Springer. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>9783662072196</bdi>.</cite></span>

</li>

<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://opcfoundation.org/about/opc-technologies/opc-classic/">"Classic"</a>.</cite></span>

</li>

<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://opcfoundation.org/developer-tools/developer-kits-classic/automation-wrapper/">"Members"</a>.</cite></span>

</li>

<li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20140703074027/https://opcfoundation.org/about/opc-technologies/opc-net-4-0/">".NET 4.0 (WCF) | OPC Foundation"</a>. <i>opcfoundation.org</i>. Archived from <a rel="nofollow" class="external text" href="https://opcfoundation.org/about/opc-technologies/opc-net-4-0/">the original</a> on 2014-07-03.</cite> </span>

</li>

<li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://opcfoundation.org/about/opc-technologies/opc-ua/">"Unified Architecture"</a>.</cite></span>

</li>

</ol></div></div>

<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><a rel="nofollow" class="external text" href="http://www.opcconnect.com/">OPC Programmers' Connection</a></li></ul>

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</style><div id="Automation_protocols213" style="font-size:114%;margin:0 4em"><a href="List_of_automation_protocols" title="List of automation protocols">Automation protocols</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Process automation</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="CC-Link_Industrial_Networks" class="mw-redirect" title="CC-Link Industrial Networks">CC-Link Industrial Networks</a></li>

<ul><li><a href="CANopen" title="CANopen">CANopen</a></li>

<li><a href="DeviceNet" title="DeviceNet">DeviceNet</a></li></ul></li>

<li><a href="ControlNet" title="ControlNet">ControlNet</a></li>

<li><a href="DirectNET_Protocol" title="DirectNET Protocol">DirectNET</a></li>

<li><a href="EtherCAT" title="EtherCAT">EtherCAT</a></li>

<li><a href="Ethernet_Global_Data_Protocol" title="Ethernet Global Data Protocol">Ethernet Global Data (EGD)</a></li>

<li><a href="Ethernet_Powerlink" title="Ethernet Powerlink">Ethernet Powerlink</a></li>

<li><a href="EtherNet/IP" title="EtherNet/IP">EtherNet/IP</a></li>

<li><a href="Factory_Instrumentation_Protocol" title="Factory Instrumentation Protocol">Factory Instrumentation Protocol</a></li>

<li><a href="FOUNDATION_fieldbus" class="mw-redirect" title="FOUNDATION fieldbus">FOUNDATION fieldbus</a>

<li><a href="Highway_Addressable_Remote_Transducer_Protocol" title="Highway Addressable Remote Transducer Protocol">HART Protocol</a></li>

<li><a href="SDS_Protocol" title="SDS Protocol">Honeywell SDS</a></li>

<li><a href="HostLink_Protocol" title="HostLink Protocol">HostLink</a></li>

<li><a href="INTERBUS" title="INTERBUS">INTERBUS</a></li>

<li><a href="MECHATROLINK" title="MECHATROLINK">MECHATROLINK</a></li>

<li><a href="MelsecNet" title="MelsecNet">MelsecNet</a></li>

<li><a href="Modbus" title="Modbus">Modbus</a></li>

<li><a href="Optomux" title="Optomux">Optomux</a></li>

<li><a href="PROFIBUS" class="mw-redirect" title="PROFIBUS">PROFIBUS</a></li>

<li><a href="PROFINET" class="mw-redirect" title="PROFINET">PROFINET</a></li>

<li><a href="RAPIEnet" title="RAPIEnet">RAPIEnet</a></li>

<li><a href="SERCOS_interface" title="SERCOS interface">SERCOS interface</a></li>

<li><a href="SERCOS_III" title="SERCOS III">SERCOS III</a></li>

<li><a href="Sinec_H1" title="Sinec H1">Sinec H1</a></li>

<li><a href="SynqNet" title="SynqNet">SynqNet</a></li>

<li><a href="TTEthernet" title="TTEthernet">TTEthernet</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Industrial_control_system" title="Industrial control system">Industrial control system</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="MTConnect" title="MTConnect">MTConnect</a></li>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Building_automation" title="Building automation">Building automation</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="BACnet" title="BACnet">BACnet</a></li>

<li><a href="BatiBUS" title="BatiBUS">BatiBUS</a></li>

<li><a href="CEBus" title="CEBus">CEBus</a></li>

<li><a href="DyNet" title="DyNet">DyNet</a></li>

<li><a href="EnOcean" title="EnOcean">EnOcean</a></li>

<li><a href="LonTalk" title="LonTalk">LonTalk</a></li>

<li><a href="Modbus" title="Modbus">Modbus</a></li>

<li><a href="OpenTherm" title="OpenTherm">OpenTherm</a></li>

<li><a href="Zigbee" title="Zigbee">Zigbee</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Power-system_automation" title="Power-system automation">Power-system automation</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Factory_Instrumentation_Protocol" title="Factory Instrumentation Protocol">Factory Instrumentation Protocol</a></li>

<li><a href="Modbus" title="Modbus">Modbus</a></li>

<li><a href="PROFIBUS" class="mw-redirect" title="PROFIBUS">PROFIBUS</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Automatic_meter_reading" title="Automatic meter reading">Automatic meter reading</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Modbus" title="Modbus">Modbus</a></li>

<li><a href="Zigbee" title="Zigbee">Zigbee</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Automobile / <a href="Vehicle_bus" title="Vehicle bus">Vehicle</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="ARINC_429" title="ARINC 429">ARINC 429</a></li>

<li><a href="Factory_Instrumentation_Protocol" title="Factory Instrumentation Protocol">Factory Instrumentation Protocol</a></li>

<li><a href="FlexRay" title="FlexRay">FlexRay</a></li>

<li><a href="IEBus" title="IEBus">IEBus</a></li>

<li><a href="Keyword_Protocol_2000" title="Keyword Protocol 2000">Keyword Protocol 2000</a></li>

<li><a href="Unified_Diagnostic_Services" title="Unified Diagnostic Services">Unified Diagnostic Services</a></li>

<li><a href="Cyphal" title="Cyphal">Cyphal</a></li></ul>

</div></td></tr></tbody></table></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2023-10-25" href="https://en.wikipedia.org/wiki/?title=OPC_Data_Access&oldid=1181851261">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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