OPC Studio User's Guide and Reference
DAAutoSubscribingParameters Class Properties


OpcLabs.EasyOpcClassicCore Assembly > OpcLabs.EasyOpc.DataAccess.Optimization Namespace : DAAutoSubscribingParameters Class

For a list of all members of this type, see DAAutoSubscribingParameters members.

Public Properties
 NameDescription
Public PropertyAbandon interval minimum. Number of milliseconds. The OPC item is considered "abandoned" if no read requests to it have been made for abandon interval. In such case it is unsubscribed. The abandon interval is computed using the aggregated read rate and AbandonRateMultiplier, but it is never shorter than value of this property.  
Public PropertyAbandon rate multiplier. Must be greater than or equal to 1.0. The OPC item is considered "abandoned" if no read requests to it have been made for abandon interval. In such case it is unsubscribed. The abandon interval is computed by multiplying the aggregated read rate and the value of this property, but it is never shorter than AbandonIntervalMinimum.  
Public PropertyAuto adjustment period. Number of milliseconds. Specifies how often the engine automatically adjusts the parameters (such as update rate) of OPC items to match the observed usage pattern (e.g. the frequency of reading the item).  
Public Propertystatic (Shared in Visual Basic)Default OPC-DA auto-subscribing parameters.  
Public PropertyFastest automatic update rate. Number of milliseconds. When the system automatically modifies the update rate of an OPC item, it never chooses a rate that is faster (has lower value) than the value of this property.  
Public PropertyThe maximum effective value age in the Read request for it to be considered in auto-subscribing.  
Public PropertyThe minimum effective value age in the Read request for it to be considered in auto-subscribing.  
Public PropertyThe minimum count of data values in the read interval aggregate.  
Public PropertyThe size of the window use by the read interval aggregate.  
Public PropertyThe factor used to calculate the requested update rate from the value age aggregate.  
Public PropertySlowest automatic update rate. Number of milliseconds. When the system automatically modifies the update rate of an OPC item, it never chooses a rate that is slower (has higher value) than the value of this property.  
Public PropertyA symbolic name of the current parameter combination if it has a standard name. Empty otherwise. (Inherited from OpcLabs.BaseLib.Parameters)
Public PropertyHysteresis for negative update rate changes. In percent, between 0.0 and 100.0. Requests to make the update rate of OPC item faster (i.e. lower value) will be ignored if the percentual change in update rate value is lower than the value of this property.  
Public PropertyHysteresis for positive update rate changes. In percent, between 0.0 and 100.0. Requests to make the update rate of OPC item slower (i.e. higher value) will be ignored if the percentual change in update rate value is lower than the value of this property.  
Public PropertyThe minimum count of data values in the value age aggregate.  
Public PropertyThe size of the window use by the value age aggregate.  
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See Also

Reference

DAAutoSubscribingParameters Class
OpcLabs.EasyOpc.DataAccess.Optimization Namespace