The AirnetOperationalTypeextends its supertype by Airnetspecific Variablesand is formally defined in Table 97.

Table 97– AirnetOperationalType Definition

Attribute

Value

BrowseName

AirnetOperationalType

IsAbstract

False

References

Node Class

BrowseName

DataType

TypeDefinition

Other

Subtype of the OperationalTypedefined in 7.45, i.e. inheriting the InstanceDeclarations of that Node.

0:HasComponent

Variable

AirDeliveryRate

0:Double

0:BaseAnalogType

O, RO

0:HasComponent

Variable

CompressorsIntegrated

0:UInt16

0:BaseAnalogType

O, RO

0:HasComponent

Variable

CompressorsIsolated

0:UInt16

0:BaseAnalogType

O, RO

0:HasComponent

Variable

CompressorsNotAvailable

0:UInt16

0:BaseAnalogType

O, RO

0:HasComponent

Variable

ControlPressure

0:Double

0:BaseAnalogType

O, RO

0:HasComponent

Variable

SpecificEnergy

0:Double

0:BaseAnalogType

O, RO

0:HasComponent

Variable

SpecificEnergyCost

0:Double

0:BaseAnalogType

O, RO

0:HasComponent

Variable

VolumeFlowRateAvailable

0:Double

0:BaseAnalogType

O, RO

0:HasComponent

Variable

VolumeFlowRateUnavailable

0:Double

0:BaseAnalogType

O, RO

The following nodes override nodes added by the OperationalType

0:HasComponent

Variable

HealthState

AirnetHealthStateEnum

0:DataItemType

O, RO

0:HasComponent

Variable

IntegratedState

AirnetIntegratedStateEnum

0:DataItemType

O, RO

0:HasComponent

Variable

OperatingState

AirnetOperatingStateEnum

0:DataItemType

O, RO

Three KPIs were defined for an Airnet. Each of these KPIs is derived from ISO 11011 and is described below. The KPIs do not have to be calculated by the OPC UA Serverbut may be calculated by the Main Control System. The definition of the KPIs is intentionally flexible so that the KPIs can be adapted to the respective system. The integrator of a KPI shall provide a detailed description via the Definition Property. For the description it is important to define system boundaries and which Componentsof an Airnetare included in the calculation. The EngineeringUnits Propertyshall be used to specify the used quantities in calculating the KPI, e.g., “€/m³” as possible unit for SpecificEnergyCost.

In practice, the values of and calculations attached to the following KPIs are vendor and system specific and may not be used to compare systems from different manufacturers, or different systems from one manufacturer unless stated otherwise in the Definition Property.

The optional Variable AirDeliveryRate indicates how much compressed air is generated in a specified time frame. Usually, the AirDeliveryRate uses the denominator 1 hour. There can be multiple KPIs of this kind for different time frames, e.g., Volume per day (24 hours), week (7 days), year (52 weeks). The value is calculated according to the following formula:

image038.png

The optional Variable SpecificEnergy indicates how much electrical energy is consumed in the generation of a specific volume of compressed air. Usually, the SpecificEnergy uses the denominator 1 m³ or 1 l. The value is calculated according to the following formula:

image039.png

The optional Variable SpecificEnergyCost indicates what the generation of a specific volume of compressed air costs. Usually, the SpecificEnergyCost uses the denominator 1 m³ or 1 l. The value is calculated according to the following formula:

image040.png

The optional VariableHealthState describes if the Requirementsof an Airnetcan be fulfilled.

The optional VariableIntegratedState describes the degree of control over the compressors for compressed air generation.

The optional VariableOperatingState describes if the Requirementsof an Airnetshould be fulfilled.

The VariableOnOff of the OperationalType should not be used for an instance of this AirnetOperationalType.

The InstanceDeclarationsof the AirnetOperationalTypehave additional Attributesdefined in Table 98.

Table 98– AirnetOperationalType Attribute values for child Nodes

Source Path

Value Attribute

Description Attribute

AirDeliveryRate

Volume of generated compressed air per time frame.

CompressorsIntegrated

Number of integrated compressors in the airnet.

CompressorsIsolated

Number of isolated compressors in the airnet.

CompressorsNotAvailable

Number of unavailable compressors in the airnet.

ControlPressure

Current pressure in the airnet.

HealthState

Actual health state of the airnet.

IntegratedState

Actual integrated state of the airnet.

OperatingState

Actual operating state of the airnet.

SpecificEnergy

Electrical energy consumed in the generation of a volume of compressed air.

SpecificEnergyCost

Costs for generating a volume of compressed air.

VolumeFlowRateAvailable

Measured or calculated available volume flow rate of the process fluid in the airnet.

VolumeFlowRateUnavailable

Calculated unavailable volume flow rate of the process fluid in the airnet.