This building block provides information about the state of a MachineryItem. It defines the states NotAvailable, OutOfService, NotExecuting and Executing. The exact semantics of the states are defined in OPC 40001-1. The StateMachine defines Transitions between all States. Instances might restrict the usage of the defined States and Transitions. An overview of the StateMachine is provided in Figure 15.

Figure 15 – MachineryItemState StateMachine