3.2 OPC UA for Compressed Air Systems terms

3.2.1 Airnet

Piping and all Components between at least two distinct points, the inputs and outputs of the Airnet, in a Compressed Air System.

Note 1 to entry: A Component can be connected to multiple Airnets.

Note 2 to entry: Airnets may touch or overlap each other.

Note 3 to entry: For examples on how Airnets can be used in the context of this specification see chapter 6.

3.2.2 CASPart

Identifiable and browsable element in a Compressed Air System.

Note 1 to entry: CASParts defined in this specification are: Airnet, all Components, Main Control System.

3.2.3 Component

CASPart that serves a particular purpose in compressed air generation, treatment, measurement, or storage.

Note 1 to entry: Components defined in this specification are: Charging System, Compressor, Condensate Drain, Condensate Separator, Converter, Cooling System, Dryer, Filter, Heat Recovery System, Receiver, Sensor.

Note 2 to entry: A Component may be connected to no, one, or more than one Airnet.

3.2.4 Compressed Air System

System that generates compressed air, consists of Components and at least one Airnet, and is commonly equipped with one Main Control System.

3.2.5 ComponentClass

Specific type of a Component and value of the ComponentClass Variable of an instance of the FunctionalGroup Design of a Component.

EXAMPLE 1The compressor C1 is of the ComponentClass Axial turbo compressor.
EXAMPLE 2The filter F1 is of the ComponentClass Activated carbon filter.

3.2.6 Customer Distribution Point

Connection point of a Compressed Air System to subsequent machines or systems.

Note 1 to entry: Usually the Customer Distribution Point is located at one of the outlets of an Airnet.

Note 2 to entry: The Customer Distribution Point provides Variables and/or Objects which describe the conditions of the compressed air.

3.2.7 DeviceClass

Specific class of a CASPart and value of the DeviceClass Property of an instance of the FunctionalGroup Identification of a CASPart.

Note 1 to entry: Available DeviceClasses for CASPart of this specification are listed in Table 9.

EXAMPLE 1The compressor C1 is of the DeviceClass Compressor.
EXAMPLE 2The filter F1 is of the DeviceClass Filter.

3.2.8 FunctionalGroup

Instance of the FunctionalGroupType or one of its subtypes.

Note 1 to entry: In this specification, FunctionalGroup usually refers to an instance of a Compressed Air System specific ObjectType like OperationalType, AnalysesType, or DesignType.

EXAMPLE 1The compressor C1 has the FunctionalGroups Identification, Design, and Operational.

3.2.9 GroupName

BrowseName of instances of the OptionalPlaceholder Object <ComponentsGroup> of instances of the ObjectType ComponentsGroupType.

Note 1 to entry: Available GroupNames for part groups of this specification are listed in Table 9.

EXAMPLE 1The Object for organizing all compressors in this Compressed Air System uses the GroupName Compressors.
EXAMPLE 2The Object for organizing all Airnets in this Compressed Air System uses the GroupName Airnets.

3.2.10 Integrated [Component]

A Component is Integrated if the Main Control System has control over the generation or treatment of compressed air.

Note 1 to entry: A compressor is Integrated if the Main Control System has control over the loaded state.

Note 2 to entry: The Main Control System can switch a Component between the two states Integrated and Isolated.

3.2.11 Isolated [Component]

A Component is Isolated if the Main Control System has no control over the generation or treatment of compressed air.

Note 1 to entry: A Component is Isolated if the Main Control System does not control the loaded state.

Note 2 to entry: The Main Control System can switch a Component between the two states Integrated and Isolated.

3.2.12 Main Control System

CASPart that controls all Components and Airnets simultaneously, represents the Compressed Air System, and serves for communication between the Components and higher-level systems.

3.2.13 Main Function [of a Component]

The actual main function of Components is not specified in this specification. The following examples of Main Functions do not imply the actual function of the referenced Component.

EXAMPLE 1Charging system: to keep pressure upstream above a set minimum pressure or within a set pressure range
EXAMPLE 2Compressor: to deliver compressed air into the piping with an expected volume flow and at an expected pressure
EXAMPLE 3Condensate drain: to remove condensate from the compressed air piping or a condensate storage to outside the pressure system
EXAMPLE 4Condensate separator: to separate the hydrocarbon contents from the condensate to create a clean condensate that can easily be disposed of
EXAMPLE 5Converter: to eliminates hydrocarbons from the compressed air stream to create class 1 (and better) oil free air
EXAMPLE 6Cooling system: to reduce the compressed air temperature to a desired level
EXAMPLE 7Dryer: to remove moisture from compressed air and dry compressed air to a pressure dew point below the required value
EXAMPLE 8Filter: to remove particles and aerosols from the compressed air flow
EXAMPLE 9Heat recovery system: Main function: to heat up a material or substance flow by using the heat generated by the compressed air system
EXAMPLE 10Receiver: to store compressed air and provide a buffer
EXAMPLE 11Sensor: to measure specific parameters in the compressed air system and provide the data

3.2.14 Quantity

A Variable representing physical measurements performed by a sensor, or calculations performed by a CASPart or the Main Control System to simulate a physical measurement.

Note 1 to entry: A physical quantity may be measured by an external sensor but is assigned to a specific CASPart.

Note 2 to entry: The measuring sensor may be integrated into the CASPart.

Note 3 to entry: A calculation performed on the Main Control System which is used by a Component shall be assigned to that Component.

EXAMPLE 1A temperature Quantity is measured by an internal sensor of a compressor at its outlet.
EXAMPLE 2A pressure Quantity is measured by an external sensor at the inlet and outlet of a filter.
EXAMPLE 3The isentropic efficiency of a compressor is a Quantity which is calculated by the Main Control System but assigned to the compressor.

3.2.15 Requirements [of an Airnet]

The actual requirements of an Airnet are not specified in this specification. The following examples of Requirements do not imply the actual requirements of an Airnet.

EXAMPLE 1The Airnet pressure shall be within range.
EXAMPLE 2The dew point shall be within range.
EXAMPLE 3The volume flow rate shall be within range.

3.2.16 Unavailable [Compressor]

A compressor is Unavailable if it cannot be Integrated and controlled by the Main Control System.

Note 1 to entry: The Main Control System cannot switch a compressor from Unavailable to any other state.

EXAMPLE 1A compressor in an error state may be Unavailable.