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  5. Exclusive rate of change alarm

Exclusive rate of change alarm

BrowseName: ExclusiveRateOfChangeAlarmController
SuperType: Exclusive limit alarm (ExclusiveLimitAlarmController)
TypeView path: Tipi > Allarmi > Allarme a frequenza di cambiamento esclusivo

Monitors the rate of change of the value of a variable in a set time. Activates when the rate of change of the value of the monitored variable reaches one or more set limits. When several limits of interest are reached consecutively, the alarm signals only the last limit reached.

Applications

Typically used to detect anomalous variations on speed variables, for example the speed of a conveyor belt.

Properties

Name

BrowseName

DataType

Description
Polling time

PollingTime

Duration

Reference interval for monitoring the rate of change of the variable value.
High-high limit

HighHighLimit

Double
High-high limit value
(Inherited from Limit alarm)
High limit

HighLimit

Double
High limit value
(Inherited from Limit alarm)
Low limit

LowLimit

Double
Low limit value
(Inherited from Limit alarm)
Low-low limit

LowLowLimit

Double
Low-low limit value
(Inherited from Limit alarm)
Enabled

Enabled

Boolean
Enable/disable the alarm.
(Inherited from Alarm controller)
Auto acknowledge

AutoAcknowledge

Boolean
True: when the alarm activates, it is automatically acknowledged and confirmed. False: when the alarm activates, it must be acknowledged by the user.
(Inherited from Alarm controller)
Auto confirm

AutoConfirm

Boolean
True: when the alarm activates, it is automatically confirmed by the application. False: when the alarm activates, it must be confirmed by the user.
(Inherited from Alarm controller)
Input variable

InputValue

Double
Variable to monitor
(Inherited from Alarm controller)
Message

Message

LocalizedText
Alarm message text
(Inherited from Alarm controller)
Severity

Severity

UInt16
Level of severity of the alarm, which indicates its priority on a scale from 1 to 1000 (in compliance with the OPC UA standard: 1 = information, 1000 = serious error).
(Inherited from Alarm controller)
Last event

LastEvent

BaseDataType
Last alarm event generated
(Inherited from Alarm controller)

Events

ExclusiveRateOfChangeAlarmType

BrowseName: ExclusiveRateOfChangeAlarmType

See also

Concetti correlati

Alarms

Procedure correlate

Set the alarms