OPC Data Access
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The OPC Data Access Specification is the first of a group of specifications known as the OPC Specifications.
OPC Data Access is a group of 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). The specifications focus on the continuous communication of data.
There is a good multimedia tutorial that explains both OPC Data Access and OPC Historical Data Access, available from [MatrikonOPC].
[Go here to download the OPC Data Access specification]
See also
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