Search

Scope: Core (OPC-10000-*) All specs

10 result(s) for DataItem

OPC-10000-8 – OPC Unified Architecture - Part 8: Data Access

3.1.1 DataItem

DataItem link to arbitrary, live automation data, that is, data that represents currently valid information Note 1 to entry: Examples of such data are device data (such as temperature sensors
OPC-10000-8 – OPC Unified Architecture - Part 8: Data Access

3.1.2 AnalogItem

AnalogItem DataItem that represents continuously-variable physical quantities (e.g., length, temperature), in contrast to the digital representation of data in discrete items Note 1 to entry: Typical examples
OPC-10000-8 – OPC Unified Architecture - Part 8: Data Access

3.1.3 DiscreteItem

DiscreteItem DataItem that represents data that can take on only a certain number of possible values (e.g., OPENING, OPEN, CLOSING, CLOSED) Note 1 to entry: Specific VariableTypes are used
OPC-10000-8 – OPC Unified Architecture - Part 8: Data Access

3.1.4 ArrayItem

ArrayItem DataItem that represents continuously-variable physical quantities and where each individual data point consists of multiple values represented by an array (e.g., the spectral response of a digital filter
OPC-10000-8 – OPC Unified Architecture - Part 8: Data Access

3.1.5 EngineeringUnits

entry: This standard defines Properties to inform about the unit used for the DataItem value and about the highest and lowest value likely to be obtained in normal operation
OPC-10000-8 – OPC Unified Architecture - Part 8: Data Access

5.3.1 DataItemType

DataItemType This VariableType defines the general characteristics of a DataItem . All other DataItem Types derive from it. The DataItemType derives from the BaseDataVariableType and therefore shares the variable model ... vendor-specific, human readable string that specifies how the value of this DataItem is calculated. Definition is non-localized and will often contain an equation that can be parsed
OPC-10000-8 – OPC Unified Architecture - Part 8: Data Access

5.3.2.2 BaseAnalogType

populated with the equivalent value for legacy reasons. EngineeringUnits specifies the units for the DataItem 's value (e.g., DEGC, hertz, seconds). The EUInformation type is specified in 5.6.4 . The NonHierarchical
OPC-10000-8 – OPC Unified Architecture - Part 8: Data Access

5.3.3.2 TwoStateDiscreteType

Conformance Units Data Access TwoState TrueState contains a string to be associated with this DataItem when it is TRUE. This is typically used for a contact when ... SAFE", etc. FalseState contains a string to be associated with this DataItem when it is FALSE. This is typically used for a contact when it is in the open
OPC-10000-8 – OPC Unified Architecture - Part 8: Data Access

5.4 Address Space model

Object of any other type. Figure 4 illustrates the basic AddressSpace model of a DataItem , in this case an AnalogItem . Figure 4 - Representation of DataItems in the AddressSpace Each DataItem ... specific set of Attribute s. The TypeDefinition reference indicates the type of the DataItem (in this case the AnalogItemType ). Additional characteristics of DataItem s are defined using Properties . The VariableTypes
OPC-40200 – OPC UA for Weighing Technology

9.2.3 MeasuredItemType Description

MeasuredItemType Description EngineeringUnits specifies the units for the DataItem s value (e.g. DEGC, hertz, seconds). The 0:EUInformation type is specified in OPC 10000-8. If the DataType