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Scope: Core (OPC-10000-*) All specs

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OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions

5.8.18 LimitAlarmType

HasProperty Variable HighHighLimit Double PropertyType Optional HasProperty Variable HighLimit Double PropertyType Optional HasProperty Variable LowLimit Double PropertyType Optional HasProperty Variable LowLowLimit Double PropertyType Optional HasProperty Variable BaseHighHighLimit Double PropertyType Optional ... LowLow. If Deadband properties are provided then: HighHighLimit - HighHighDeadband > HighLimit HighLimit - HighDeadband > LowLimit LowLimit + LowDeadband < HighLimit LowLowLimit + LowLowDeadband < LowLimit Four optional base limits are defined that
OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions

5.8.22.1 Overview

included limit. In this case, the SetpointNode would point to the secondary source. The LowLimit and LowLowLimit shall be negative, indicating a number below the target value and the HighLimit ... limits shall not be zero and shall follow these rules: HighHighLimit > HighLimit LowLimit > LowLowLimit . For example, if the LowLimit is -2 then a LowLowLimit of -1 would