class DataChangeFilter#

Defines a DataChangeFilter for a monitored item. More…

Synopsis#

Methods#

def __init__()
def deadbandType()
def deadbandValue()
def __eq__()
def setDeadbandType()
def setDeadbandValue()
def setTrigger()
def trigger()

Note

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Detailed Description#

This class is used to set up filtering for a DataChange monitored item. It is defined in OPC UA 1.05 part 4, 7.22.2.

class DataChangeTrigger#

Enumerates the possible triggers for a DataChangeFilter .

Constant

Description

QOpcUaMonitoringParameters.DataChangeFilter.DataChangeTrigger.Status

Triggers if the value’s status code changes.

QOpcUaMonitoringParameters.DataChangeFilter.DataChangeTrigger.StatusOrValue

Triggers if the value’s status code or the value itself changes.

QOpcUaMonitoringParameters.DataChangeFilter.DataChangeTrigger.StatusOrValueOrTimestamp

Triggers if the value’s status code, the value itself or the source timestamp changes.

Constant	Description
QOpcUaMonitoringParameters.DataChangeFilter.DataChangeTrigger.Status	Triggers if the value’s status code changes.
QOpcUaMonitoringParameters.DataChangeFilter.DataChangeTrigger.StatusOrValue	Triggers if the value’s status code or the value itself changes.
QOpcUaMonitoringParameters.DataChangeFilter.DataChangeTrigger.StatusOrValueOrTimestamp	Triggers if the value’s status code, the value itself or the source timestamp changes.

class DeadbandType#

Enumerates the possible deadband types for a DataChangeFilter .

Constant

Description

QOpcUaMonitoringParameters.DataChangeFilter.DeadbandType.None

No deadband filtering.

QOpcUaMonitoringParameters.DataChangeFilter.DeadbandType.Absolute

A notification is generated if the absolute value of the difference between the last cached value and the current value is greater than the deadband value.

QOpcUaMonitoringParameters.DataChangeFilter.DeadbandType.Percent

Only valid for AnalogItems with an EURange property. A notification is generated if the absolute value of the difference between the last cached value and the current value is greater than value percent of the EURange.

Constant	Description
QOpcUaMonitoringParameters.DataChangeFilter.DeadbandType.None	No deadband filtering.
QOpcUaMonitoringParameters.DataChangeFilter.DeadbandType.Absolute	A notification is generated if the absolute value of the difference between the last cached value and the current value is greater than the deadband value.
QOpcUaMonitoringParameters.DataChangeFilter.DeadbandType.Percent	Only valid for AnalogItems with an EURange property. A notification is generated if the absolute value of the difference between the last cached value and the current value is greater than value percent of the EURange.

__init__()#

Constructs a data change filter with trigger on status, deadband type none and deadbandValue 0.

__init__(trigger, deadbandType, deadbandValue)

Parameters:

trigger – DataChangeTrigger
deadbandType – DeadbandType
deadbandValue – float

Constructs a data change filter with trigger trigger, deadband type deadbandType and deadband value deadbandValue.

__init__(arg__1)

Parameters:: arg__1 – DataChangeFilter

Constructs a data change filter from rhs.

deadbandType()#

Return type:: DeadbandType

Returns the deadband type.

See also

setDeadbandType()

deadbandValue()#

Return type:: float

Returns the deadband value.

See also

setDeadbandValue()

__eq__(rhs)#

Parameters:: rhs – DataChangeFilter
Return type:: bool

Returns true if this data change filter has the same value as rhs.

setDeadbandType(deadbandType)#

Parameters:: deadbandType – DeadbandType

Sets the deadband type to deadbandType.

See also

deadbandType()

setDeadbandValue(deadbandValue)#

Parameters:: deadbandValue – float

Sets the deadband value to deadbandValue.

See also

deadbandValue()

setTrigger(trigger)#

Parameters:: trigger – DataChangeTrigger

Sets the trigger to trigger.

See also

trigger()

trigger()#

Return type:: DataChangeTrigger

Returns the trigger.

See also

setTrigger()