This document specifies the representation of Alarms and Conditionsin the OPC Unified Architecture. Included is the Information Modelrepresentation of Alarms and Conditionsin the OPC UA address space. Other aspects of alarm systems like alarm philosophy, life cycle, alarm response times, alarm types and many other details are captured in standards such as IEC 62682and ISA 18.2. The Alarmsand Conditions Information Modelin this specification, is designed in accordance with IEC 62682and ISA 18.2. Annex Cspecifies how the model described in this document maps to EEMUA. Annex Dspecifies a recommended mapping between OPC Classic Alarm & Events (A&E) servers to the model described in this document.