AnalogSignalType – OPC UA for Process Automation Devices

7.26 AnalogSignalType

The AnalogSignalType provides ObjectType to add variables and ZeroPointAdjustment Method. It is formally defined in Table 150.

Table 150 - AnalogSignalType definition

Attribute	Value
BrowseName	AnalogSignalType
IsAbstract	False

References	NodeClass	BrowseName	DataType	TypeDefinition	Other
Subtype of SignalType defined in 7.23, i.e. inheriting the InstanceDeclarations of that Node
0:HasComponent	Method	ZeroPointAdjustment	Defined in 9.2		O
0:HasComponent	Variable	AnalogSignal	0:Number{Any}	AnalogSignalVariableType	M
0:HasComponent	Object	<SignalCalibrationIdentifier>		0:BaseObjectType	OP
0:HasComponent	Object	SignalConditionSet		0:BaseObjectType	O

Conformance Units
PA-DIM Analog Signal
PA-DIM ZeroPointAdjustment method
PA-DIM ICalibration
PA-DIM ICalibration CalibrationTimestamp
PA-DIM ICalibration TypeOfCalibration
PA-DIM ICalibration CalibrationPointSet
PA-DIM Signal Condition Set

ZeroPointAdjustment: ABN614#002 defines property that initiates when set the TRUE (ON) state a procedure, which maybe automatic, to define or set the value zero of the output. Remark: properties can be variables or methods according to IEC 61987 CDD.

AnalogSignal provides the measured or readback process value. The unit of this value is provided by the EngineeringUnits property.

<SignalCalibrationIdentifier> is a container object for the calibration parameters of the signal. It has an interface reference to ICalibrationType in order to add general calibration variables. Since it is a placeholder, an instance of AnalogSignalType can have several calibration objects.

SignalConditionSet is a container object for the condition parameters of the signal.

The components of AnalogSignalType have additional references which are defined in Table 151.

Table 151 - AnalogSignalType additional References

SourceBrowsePath

Reference Type

Is Forward

TargetBrowsePath

AnalogSignal

0:EngineeringUnits

0:HasDictionaryEntry

True

3:0112/2///61987#ABA968#004

0:HasInterface

True

ICalibrationType

ZeroPointAdjustment

0:HasDictionaryEntry

True

3:0112/2///61987#ABN614#002

The components of AnalogSignalType have additional subcomponents which are defined in Table 152.

Table 152 - AnalogSignalType additional subcomponents

BrowsePath	References	NodeClass	BrowseName	DataType	TypeDefinition	Others
Applied from ICalibrationType
<SignalCalibrationIdentifier>	0:HasProperty	Variable	CalibrationTimestamp	0:DateTime	0:PropertyType	O
<SignalCalibrationIdentifier>	0:HasComponent	Variable	TypeOfCalibration	0:UInt32	0:MultiStateDictionaryEntryDiscreteType	O
<SignalCalibrationIdentifier>	0:HasComponent	Object	CalibrationPointSet		CalibrationPointSetType	O

The child Nodes of the AnalogSignalType have additional Attribute values defined in Table 153.

Table 153 - AnalogSignalType Attribute values for child Nodes

BrowsePath

Value Attribute

CalibrationTimestamp

1/1/1601 12:00:00 AM

TypeOfCalibration

TypeOfCalibration

0:ValueAsDictionaryEntries

ns=3;s=0112/2///61987#ABP732#001

TypeOfCalibration

0:ValueAsText

adjustment