OPC 10000-8: OPC Unified Architecture

Part 8: Data Access

Release 1.05.00
2021-10-12

Copyright (c) 2021 OPC Foundation
Generated on 10/27/2021 4:28:09 AM.

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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 abbreviated terms
    3.1 Terms and definitions
    3.2 Abbreviated terms

4 Concepts

5 Model
    5.1 General
    5.2 SemanticsChanged
    5.3 Variable Types
        5.3.1 DataItemType
        5.3.2 AnalogItem VariableTypes
            5.3.2.1 General
            5.3.2.2 BaseAnalogType
            5.3.2.3 AnalogItemType
            5.3.2.4 AnalogUnitType
            5.3.2.5 AnalogUnitRangeType
        5.3.3 DiscreteItemType
            5.3.3.1 General
            5.3.3.2 TwoStateDiscreteType
            5.3.3.3 MultiStateDiscreteType
            5.3.3.4 MultiStateValueDiscreteType
        5.3.4 ArrayItemType
            5.3.4.1 General
            5.3.4.2 YArrayItemType
            5.3.4.3 XYArrayItemType
            5.3.4.4 ImageItemType
            5.3.4.5 CubeItemType
            5.3.4.6 NDimensionArrayItemType
    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
            5.6.3.1 General
            5.6.3.2 Definition of EUInformation
            5.6.3.3 Mapping of UN/CEFACT to 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 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.3.1.1 General
            A.3.1.2 Branch
            A.3.1.3 Item
            A.3.1.4 Property
            A.3.1.5 BrowseName and DisplayName Mapping
        A.3.2 Data and error mapping
            A.3.2.1 General
            A.3.2.2 Value
            A.3.2.3 Quality
            A.3.2.4 Timestamp
        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.4.2.1 General
            A.4.2.2 Object Nodes
            A.4.2.3 Variable Nodes
            A.4.2.4 Namespace Indices
        A.4.3 Data and error mapping
            A.4.3.1 General
            A.4.3.2 Value
            A.4.3.3 Quality
            A.4.3.4 Timestamp
        A.4.4 Read data
        A.4.5 Write data
        A.4.6 Subscriptions