OPC UA for Compressed Air Systems - Part 1: Main Control Systems
7.50 DryerOperationalType ObjectType Definition
The DryerOperationalType extends its supertype by dryer specific Variables and is formally defined in Table 106.
Table 106 - DryerOperationalType Definition
Attribute
Value
BrowseName
DryerOperationalType
IsAbstract
False
References
Node Class
BrowseName
DataType
TypeDefinition
Other
Subtype of the OperationalType defined in 7.45, i.e. inheriting the InstanceDeclarations of that Node.
0:HasComponent
Variable
PressureDewPoint
0:Double
0:BaseAnalogType
O, RO
The following nodes override nodes added by the OperationalType
0:HasComponent
Variable
OnOff
0:Boolean
0:TwoStateDiscreteType
O, RO
0:HasComponent
Variable
OperatingState
DryerOperatingStateEnum
0:DataItemType
O, RO
The following illustrations of a state machines do not imply the actual function or state machines for dryers. It serves as an example of how the actual state machines may function.
Figure 33 -DryerOperationalType Adsorption Dryer State Machine IllustrationFigure 34 -DryerOperationalType Refrigerant Dryer State Machine IllustrationFigure 35 -DryerOperationalType Membrane Dryer State Machine Illustration
The InstanceDeclarations of the DryerOperationalTypehave additional Attributes defined in Table 107.
Table 107 - DryerOperationalType Attribute values for child Nodes
Source Path
Value Attribute
Description Attribute
OnOff
Actual OnOff state of the dryer. For membrane dryers this describes the state of the controller.
OnOff
0:FalseState
"The dryer is switched off."
OnOff
0:TrueState
"The dryer is switched on."
OperatingState
Actual operating state of the dryer.
PressureDewPoint
Measured or calculated actual pressure dew point of the process fluid at a dryer.
