12.2 MachineryItemState_StateMachineType

The MachineryItemState_StateMachineType is a subtype of FiniteStateMachineType defined in OPC 10000-16. The semantic of this AddIn is to provide the state of a MachineryItem. It is formally defined in Table 29.

The States and Transitions define a StateMachine as shown in Figure 14. It does not define an initial State, i.e., the initial State is vendor-specific.

Note: None of the States or Transitions have a ModellingRule, i.e., they are only provided in the TypeDefinition, not on the instance. The CurrentState Variable (inherited from StateMachineType) contains the information of the current State of the instance.

The NotAvailable State represents that the MachineryItem is not available and does not perform any activity. Examples for this State are that the Machine is switched off or is in energy saving mode.

Note: Activity can be part of the production, preparation or maintenance process.

Note: The NotAvailable State should only be used, when the State of the Machine is known. If the OPC UA Server is for example deployed outside the Machine and just lost the connection to the Machine, it should rather use a Bad StatusCode for the CurrentState than the NotAvailable State.

Note: Depending on the deployment of the OPC UA Server, the NotAvailable State might never be provided by the OPC UA Server, since the Server might not be available when the Machine is not available, e.g., if the OPC UA Server is deployed on a PLC of the Machine.

The OutOfService State represents that the MachineryItem is not functional and does not perform any activity. Examples for this State are that the Machine is in an error or blocked.

The NotExecuting State represents that the MachineryItem is available & functional and does not perform any activity. It waits for an action from outside to start or restart an activity. Examples for this State are that the Machine is waiting for a new order to be produced, a piece put into the Machine or an automatic or manual activation to be executed.

The Executing State represents that the Machine is available & functional and is actively performing an activity (pursues a purpose). Examples for this State are that the Machine is producing, transporting or processing something or executing a maintenance process.

The meaning of the Transitions is defined in the Description of Table 30.

The InstanceDeclarations of the MachineryItemState_StateMachineType have additional Attribute values defined in Table 30.

The components of the MachineryItemState_StateMachineType have additional References which are defined in Table 31.