The (COSEM_Class_Id, COSEM_Object_Instance_Id, COSEM_Object_Attribute_Id) triplet references non-ambiguously one and only one attribute of a COSEM interface object instance.
The Attribute_Value parameter carries the value of this attribute. More information about the notified event may be obtained by interrogating this COSEM interface object.
Use
A possible logical sequence of the EventNotification service primitives is illustrated in Figure 67 f) and g).
The .request primitive is invoked by the server AP to send the value of a COSEM interface object attribute to the remote client AP. Upon the reception of the .request primitive, the Server AL builds the EventNotificationRequestAPDU.