Table 60describes the details of the A & E Wrapper Facet. This Facet specifies the requirements for a UA Serverthat wraps an OPC Alarm& Event(AE) Server(COM). This Profileidentifies the sub-set of the UA Alarm& Conditionmodel which is provided by the COM OPC AE specification. It is intended to provide guidance to developers who are creating servers that front end existing applications. It is important to note that some OPC A&E COM Serversmay not support all of the functionality provided by an OPC UA A&C server, in these cases similar functionality maybe available via some non-OPC interface. For example if an A&E COM server does not support sending AlarmAcknowledgement messages to the system that it is obtaining alarm information from, this functionality may be available via some out of scope features in the underlying Alarmsystem. Another possibility is that the underlying system does not require acknowledgements or automatically acknowledges the alarm.

Table 60– A & E Wrapper Facet

Group

Conformance Unit / ProfileTitle

Optional

Address Space Model

Address Space Events

False

Address Space Model

Address Space Notifier Hierarchy

False

Address Space Model

Address Space Source Hierarchy

False

Alarmsand Conditions

A & C Acknowledge

False

Alarmsand Conditions

A & C Alarm

False

Alarmsand Conditions

A & C Basic

False

Alarmsand Conditions

A & C ConditionClasses

False

Alarmsand Conditions

A & C Refresh

False

Alarmsand Conditions

A & E Wrapper Mapping

False

Monitored Item Services

Monitor Basic

False

Monitored Item Services

Monitor Complex EventFilter

False

Monitored Item Services

Monitor Events

False

Monitored Item Services

Monitor Items 2

False

Monitored Item Services

Monitor QueueSize_ServerMax

False

Subscription Services

SubscriptionBasic

False

Subscription Services

SubscriptionMinimum 1

False

Subscription Services

SubscriptionPublish Discard Policy

False

Subscription Services

SubscriptionPublish Min 02

False