| Name | Description | |
|---|---|---|
 | AbandonIntervalMinimum | Abandon 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. |
| AbandonRateMultiplier | Abandon 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. |
| AutoAdjustmentPeriod | Auto 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). |
| DisplayString | The display string for the current object. |
| FastestAutomaticUpdateRate | Fastest 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. |
| MaximumEffectiveValueAge | The maximum effective value age in the Read request for it to be considered in auto-subscribing. |
| MinimumEffectiveValueAge | The minimum effective value age in the Read request for it to be considered in auto-subscribing. |
| ReadIntervalAggregateMinimumValues | The minimum count of data values in the read interval aggregate. |
| ReadIntervalAggregateWindowSize | The size of the window use by the read interval aggregate. |
| RequestedUpdateRateFactor | The factor used to calculate the requested update rate from the value age aggregate. |
| SlowestAutomaticUpdateRate | Slowest 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. |
| StandardName | A symbolic name of the current parameter combination if it has a standard name. Empty otherwise. |
| UpdateRateNegativeHysteresis | Hysteresis 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. |
| UpdateRatePositiveHysteresis | Hysteresis 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. |
| ValueAgeAggregateMinimumValues | The minimum count of data values in the value age aggregate. |
| ValueAgeAggregateWindowSize | The size of the window use by the value age aggregate. |
QuickOPC User's Guide and Reference
_DAAutoSubscribingParameters Interface Members
