scope:

The IEC 61970-405 Generic Eventing and Subscription (GES) specification specifies a generalized interface for efficient exchange of messages. The specification takes into account the latencies caused by a Local Area Network (LAN) providing efficient data exchange also over Local Area Networks. The Generic Eventing and Subscription (GES) API is expected to provide one of the primary means for accomplishing application integration. Beyond the scope of the GES API, other APIs address the high performance, real-time interactive needs of an application within a running system as well as request/reply oriented generic data access. IEC 61970-405 is derived from the OMG DAIS A&E specification. OMG DAIS A&E relies on the OMG DAF and OPC A&E specifications. OMG DAIS A&E is a Platform Specific Model (PSM) with CORBA as the platform and OPC A&E is a PSM with Microsoft COM as the platform. The IEC 61970-405 specification describe the functionality in a technology independent way, it is a Platform Independent Specification (PIM). Hence it explains the functionality to a level that can be used to create PSMs or be an introduction to existing PSMs, i.e. DAIS A&E and OPC A&E. Implementers wanting an introduction to OMG DAIS A&E and OPC A&E shall read these documents. The IEC 61970-405 specification has two parts - SCADA alarms and events that is the Platform Independent Specification (PIM) derived from DAIS A&E and OPC A&E. This part is called "Generic Eventing and Subscription Alarms and Events" (GES A&E). - Generic messaging that is a generalization of the SCADA alarms and events. This part is just called "Generic Eventing and Subscription" (GES). IEC 61970-1 provides the EMS-API reference model upon which this standard is based. In that reference model, the terminology used in this technical specification is introduced and the role of the CIS is explained. IEC 61970-401 provides an overview and framework for the CIS (IEC 61970-4XX) standards.IEC 61970-402: Common Services provides the base services to be used in conjunction with other Part 4 specifications. This specification extends the Common Services to provide an event subscription oriented mechanism for applications to exchange CIM data. The mapping of IEC 61970-405 to implementation specific technologies or Platform Specific Models (PSMs) is further described in a separate series of documents, i.e. the future IEC 61970-5XX. For actual implementations the future IEC 61970-5XX, OMG DAIS A&E, OMG DAF or OPC A&E shall be used.