15 Profiles and Namespaces 
15.3 Server Facets
The following tables specify the Facets available for Servers that implement the OPC UA for IO-Link Information Model companion specification.
15.3.1 IO-Link Event Facet
The “IO-Link Event Facet” defines a Facet for the functionality necessary for IO-Link Events derived from Type IOLinkEventType (see 9.2).
The content of the Profile if defined in Table 73.
Table 73 – IO-Link Event Facet
| Conformance Unit | Description | Optional/ Mandatory |
|---|---|---|
| IO-Link Events | Supports Events derived from the IOLinkEventType. | M |
| Profiles | ||
| Standard Event Subscription Server Facet http://opcfoundation.org/UA-Profile/Server/StandardEventSubscription |
In addition, OPC UA Servers supporting this Facet may optionally also support the Facets defined in Table 74.
Table 74 – Optional Facets for IO-Link Event Facet
| Profiles |
|---|
| Address Space Notifier Server Facet http://opcfoundation.org/UA-Profile/Server/AddressSpaceNotifier |
| Auditing Server Facet http://opcfoundation.org/UA-Profile/Server/Auditing |