Alarmfor which the set point or limits are changed by an algorithm.
Note 1to entry: AdaptiveAlarmsare alarms that are adjusted automatically by algorithms. These algorithms might detect conditions in a plant and change setpoints or limits to keep alarms from occurring. These changes occur, in many cases, without Operatorinteractions.
condition during which the alarm rate is greater than the Operatorcan effectively manage
application that manages alarms in a system
Note 1An AlarmManagerusually includes higher level functionality like intelligent alarm suppression or dynamic adjustment of limits or other alarm management functionality. It will still act on the alarm model associated with the actual alarm source.
Note 1to entry: An AlarmSuppressionGroupis an instance of an AlarmGroupTypethat is used to suppress other Alarms. If any Alarmin the group is active, then the AlarmSuppressionGroupis active. If all Alarmsin the AlarmSuppressionGroupare inactive then the AlarmSuppressionGroupis inactive.
Note 1to entry: Some top-level ConditionClassesare defined in this specification. Vendors or organisations may derive more concrete classes or define different top-level classes.
specific state of a Condition
element which a specific Conditionis based upon or related to
In Events generated for Conditions, the SourceNode Property (inherited from the BaseEventType) will contain the NodeId of the ConditionSource.
In IEC 62682disable has been replaced with “Out of Service”.
alarm that remains in alarm state after the process condition has returned to normal and requires an Operatorreset before the alarm returns to normal
special user who is assigned to monitor and control a portion of a process
Note 1to entry: “A Member of the operations team who is assigned to monitor and control a portion of the process and is working at the control system’s Console” as defined in EEMUA. In this standard an Operator is a special user. All descriptions that apply to general users also apply to Operators.
Note 1to entry: This concept is further defined in EEMUA.
act of determining whether an Alarmshould not occur
Note 1 to entry: “An Alarm is suppressed when logical criteria are applied to determine that the Alarm should not occur, even though the base Alarm Condition (e.g. Alarm setting exceeded) is present” as defined in EEMUA. In IEC 62682Suppressed Alarms are also described as being “Suppressed by Design”, in that the system is designed with logic to Suppress an Alarm when certain criteria exist. For example, if a process unit is taken off line then low level alarms are Suppressed for all equipment in the off-line unit.