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OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions3.1.15 RateOfChangeAlarmRateOfChangeAlarm alarm generated when the change in process variable per unit time (dPV/dt) exceeds a defined setpoint Note 1 to entry: This definition is copied from
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OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions5.8.23.1 OverviewOverview A RateOfChangeAlarm is commonly used to report an unusual change or lack of change in a measured value related to the speed at which the value has changed ... RateOfChangeAlarm becomes active when the rate at which the value changes exceeds or drops below a defined limit. A RateOfChangeAlarm is measured in some time unit, such as seconds