OPC 10000-8: OPC Unified Architecture

Part 8: Data Access

Release 1.04

Copyright (c) 2021 OPC Foundation
Generated on 4/8/2021 11:03:09 PM.

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This document is a copy of the original which can be found here.

Table of Contents

1 Scope

2 Normative references

3 Terms, definitions and abbreviations
    3.1 Terms and definitions
    3.2 Abbreviations and symbols

4 Concepts

5 Model
    5.1 General
    5.2 SemanticsChanged
    5.3 Variable Types
        5.3.1 DataItemType
        5.3.2 AnalogItem VariableTypes
        5.3.3 DiscreteItemType
        5.3.4 ArrayItemType
    5.4 Address Space model
    5.5 Attributes of DataItems
    5.6 DataTypes
        5.6.1 Overview
        5.6.2 Range
        5.6.3 EUInformation
        5.6.4 ComplexNumberType
        5.6.5 DoubleComplexNumberType
        5.6.6 AxisInformation
        5.6.7 AxisScaleEnumeration
        5.6.8 XVType

6 Data Access specific usage of Services
    6.1 General
    6.2 PercentDeadband
    6.3 Data Access status codes
        6.3.1 Overview
        6.3.2 Operation level result codes
        6.3.3 LimitBits

Annex A (informative): OPC COM DA to UA Mapping
    A.1 Introduction
    A.2 Security Considerations
    A.3 COM UA wrapper for OPC DA Server
        A.3.1 Information Model mapping
        A.3.2 Data and error mapping
        A.3.3 Read data
        A.3.4 Write Data
        A.3.5 Subscriptions
    A.4 COM UA proxy for DA Client
        A.4.1 Guidelines
        A.4.2 Information Model and Address Space mapping
        A.4.3 Data and error mapping
        A.4.4 Read data
        A.4.5 Write data
        A.4.6 Subscriptions