This part of IEC 62541 specifies how OPC Unified Architecture (OPC UA) Clients and Servers interact with DiscoveryServers when used in different scenarios. It specifies the requirements for theLocalDiscoveryServer, LocalDiscoveryServer-ME and GlobalDiscoveryServer.It also defines information models forCertificatemanagement,KeyCredentialmanagement andAuthorization Services.All current amendments available at time of purchase are included with the purchase of this document.