OPC Studio User's Guide and Reference
OpcLabs.EasyOpc.DataAccess Namespace (OpcLabs.EasyOpcClassicCore)
Inheritance Hierarchy
OpcLabs.EasyOpcClassicCore Assembly : OpcLabs.EasyOpc.DataAccess Namespace
This namespace contains classes that facilitate easy work with OPC Data Access.
Classes
 ClassDescription
ClassIndicates if the item is read only, write only or read/write.
ClassContains filtering conditions for OPC Data Access node browsing.
ClassContains subscription parameters, such as the requested update rate.
ClassContains information necessary to identify an OPC item, such as its Item Id.
ClassContains information necessary to identify an OPC Data Access node, such as its Item Id.
ClassContains information necessary to identify an OPC property, such as its Property Id.
ClassThe identifying number assigned by the OPC server to the property.
ClassRepresents the quality state for an item's data value.
ClassContains parameters for OPC read operations, such as the data source or value age.
ClassContains static members that facilitate work with types related to OPC Data Access.
ClassHolds data value, timestamp and quality, abbreviated sometimes as VTQ. This is a common combination in OPC, e.g. returned when an OPC item is read.
ClassContains URI strings used by OPC-DA client object.
ClassContains extension methods to the IEasyDAClient interface.
Interfaces
 InterfaceDescription
InterfaceAllows simple access to OPC Data Access servers.
InterfaceProvides access to dequeuing for IEasyDAClient objects.
InterfaceProvides access to settings for IEasyDAClient objects.
Delegates
 DelegateDescription
DelegateRepresents the method that will handle an event raised for every significant change in a subscribed OPC item.
Enumerations
 EnumerationDescription
EnumerationContains pre-defined constants of DAAccessRight internal values.
EnumerationAn enumeration specifying which subset of browse elements to return.
EnumerationSelects the data source for OPC reads (from device, from OPC cache, or dynamically determined).
EnumerationThe Limit bit field of OPC quality.
EnumerationContains pre-defined constants of DAPropertyId internal values.
EnumerationContains pre-defined constants of DAQuality internal values.
EnumerationThe QualityChoice bit field, i.e. the most significant part of the OPC quality flags.
EnumerationStatus is a combination of QualityChoice and Substatus. Which Substatus values can be used depend on QualityChoice.
See Also

Reference

OpcLabs.EasyOpcClassicCore Assembly