In many cases Clientsdo not know which Serversexist but possibly know which hosts might have Serverson them. In this situation the Clientwill look for the LocalDiscoveryServeron a host by constructing a DiscoveryUrlusing the well-known addresses defined in OPC 10000-6.

If a Clientfinds a LocalDiscoveryServerthen it will call the FindServers Serviceon the LDS to obtain a list of Servers and theirDiscoveryUrls. The Clientwould then call the GetEndpoints service for one of the Serversreturned. The discovery process for this scenario is illustrated in Figure 3.


Figure 3– The Local Discovery Process