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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.
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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
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allows the same functionality but offers platform independence and optionally complex information modelling capabilities.
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Technology: Industrial Network Standards for Real-Time Distributed Control
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259:, or OPC AE). There are three attributes associated with OPC DA data. These are
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standards that provides specifications for communicating real-time data from
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systems. The specifications focus on the continuous communication of data.
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and other automation-enabled languages. Several vendors offer
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https://opcfoundation.org/about/opc-technologies/opc-classic/
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toolkits to make the OPC interface accessible in .NET
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285:The OPC Classic specifications are based on the
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310:interface is also defined for access from
209:Specification is the first of a group of
106:Learn how and when to remove this message
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232:to display and interface devices like
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411:Mahalik, Nitaigour P. (2013-03-09).
44:adding citations to reliable sources
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13:
359:Distributed Component Object Model
14:
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467:".NET 4.0 (WCF) | OPC Foundation"
333:) specification is based on WCF (
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628:Factory Instrumentation Protocol
335:Windows Communication Foundation
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31:needs additional citations for
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220:OPC Data Access is a group of
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1095:Unified Diagnostic Services
566:CC-Link Industrial Networks
506:OPC Programmers' Connection
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147:; 28 years ago
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253:OPC Historical Data Access
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364:OPC Unified Architecture
342:OPC Unified Architecture
292:technology and define a
234:Human–Machine Interfaces
217:Classic Specifications.
188:OPC Unified Architecture
119:OPC Data Access (OPC DA)
976:Automatic meter reading
916:Power-system automation
489:"Unified Architecture"
168:Information technology
164:Operational technology
124:International standard
1142:Industrial automation
1090:Keyword Protocol 2000
257:OPC Alarms and Events
542:Automation protocols
329:The newer OPC .NET (
127:OPC DA specification
40:improve this article
788:Building automation
638:FOUNDATION fieldbus
174:Compatible hardware
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618:Ethernet Powerlink
549:Process automation
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270:of the value, and
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55:"OPC Data Access"
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473:. Archived from
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500:External links
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477:on 2014-07-03.
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398:"What is OPC?"
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303:. A standard
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222:client–server
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213:known as the
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184:Superseded by
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57: –
56:
52:
51:Find sources:
45:
41:
35:
34:
29:This article
27:
23:
18:
17:
767:
685:MECHATROLINK
483:
475:the original
470:
461:
447:
433:
417:. Springer.
413:
406:
392:
378:
339:
328:
324:applications
312:Visual Basic
284:
280:
250:
219:
206:
204:
132:Developed by
102:
93:
83:
76:
69:
62:
50:
38:Please help
33:verification
30:
1112:(SAE J2716)
984:ANSI C12.18
934:IEC 60870-6
929:IEC 60870-5
623:EtherNet/IP
745:TTEthernet
730:SERCOS III
593:ControlNet
370:References
305:Automation
142:Introduced
66:newspapers
1053:NMEA 2000
1048:SAE J1939
1043:ARINC 825
1033:ARINC 429
989:IEC 61107
956:IEC 62351
951:IEC 61850
924:IEC 60870
871:OpenTherm
763:MTConnect
690:MelsecNet
603:DirectNET
586:DeviceNet
453:"Members"
439:"Classic"
384:"Members"
301:interface
287:Microsoft
275:timestamp
96:July 2016
1136:Category
966:PROFIBUS
735:Sinec H1
720:RAPIEnet
715:PROFINET
710:PROFIBUS
675:INTERBUS
670:HostLink
608:EtherCAT
348:See also
263:a value,
160:Industry
1070:FlexRay
1038:CAN bus
1020:Vehicle
861:LonTalk
836:EnOcean
806:BatiBUS
773:OPC HDA
740:SynqNet
700:Optomux
680:IO-Link
655:GE SRTP
581:CANopen
576:CAN bus
308:wrapper
268:quality
236:(HMI),
194:Website
178:Windows
152:1996-08
150: (
80:scholar
1121:Cyphal
1009:Zigbee
1004:Modbus
961:Modbus
906:Zigbee
901:Z-Wave
866:Modbus
801:BACnet
796:1-Wire
778:OPC UA
768:OPC DA
695:Modbus
421:
331:OPC Xi
316:Delphi
82:
75:
68:
61:
53:
1085:J1708
1080:J1587
1075:IEBus
999:M-Bus
831:DyNet
816:CEBus
811:C-Bus
238:SCADA
87:JSTOR
73:books
1110:SENT
1105:MOST
1028:AFDX
941:DNP3
881:VSCP
876:oBIX
821:DALI
705:PieP
633:FINS
598:DF-1
561:BSAP
556:AS-i
419:ISBN
320:.NET
266:the
230:PLCs
205:The
166:and
59:news
1116:VAN
1100:LIN
1058:FMS
896:xPL
891:xAP
886:X10
856:KNX
851:FIP
846:EIB
841:EHS
826:DSI
648:HSE
571:CIP
298:C++
290:COM
246:MES
242:ERP
215:OPC
42:by
1138::
643:H1
469:.
326:.
314:,
273:a
534:e
527:t
520:v
491:.
455:.
441:.
427:.
400:.
386:.
296:/
294:C
277:.
244:/
154:)
109:)
103:(
98:)
94:(
84:·
77:·
70:·
63:·
36:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
