Table 38describes the details of the Standard DataChange Subscription ServerFacet. This Facet specifies the standard support of subscribing to data changes. This Facet extends features and limits defined by the Embedded Data Change SubscriptionFacet. As a minimum, Serversshall support 2 Subscriptions with at least 100 items for at least half of the required Sessions. The 100 items shall be supported for at least half of the required Subscriptions. Queuing with up to two queued entries is required. Support of five parallel Publish requests per Sessionis required. This Facet also requires the support of the triggering service. This Facet has been updated to include optional ConformanceUnitsto allow for backward compatibility. These optional ConformanceUnitsare highly recommended, in that in a future release they will be made mandatory.
Table 38– Standard DataChange Subscription Server Facet
Group |
Conformance Unit / ProfileTitle |
Optional |
Embedded DataChange Subscription ServerFacet |
False |
|
Base Information |
Base Info GetMonitoredItems Method |
True |
MethodCall |
True |
|
Monitored Item Services |
Monitor Items 10 |
False |
Monitored Item Services |
Monitor Items 100 |
False |
Monitored Item Services |
Monitor MinQueueSize_02 |
False |
Monitored Item Services |
Monitor Triggering |
False |
Monitored Item Services |
Monitored Items Deadband Filter |
False |
SubscriptionMinimum 02 |
False |
|
SubscriptionPublish Min 05 |
False |