. OPC Unified Architecture Part 9: Alarms & Conditions. Release 1.04. November 22, 2017. , OPC Foundation, 2017.

This document is part of the OPC Unified Architecture (OPC UA) series of standards and defines the information model for Alarms and Conditions, as well as their representation within the OPC UA address space. It details condition models common to various industrial sectors, acknowledgment and confirmation mechanisms, alarm states (active, disabled, shelved, etc.), associated methods (Enable, Disable, Acknowledge, Confirm, Reset, Silence, etc.), principles of compliance with IEC 62682 and ISA 18.2 standards, and bridge (wrapper/proxy) mechanisms for integration with legacy COM A&E systems.