7.2 Identification and MachineryBuildingBlocks

The MachineIdentificationType is defined in OPC UA for Machinery (OPC 40001-1) and provides basic information on a machine/device.

For the InstanceDeclaration the ModellingRules of the Properties Model and DeviceClass are overridden to mandatory.

The Object MachineryBuildingBlocks contains building blocks from OPC UA for Machinery as defined in OPC 40001-1. For this version of OPC 40082-4, the Object uses the two AddIns MachineryItemState and MachineryOperationMode.

Table 2 – DosingSystemType Additional Subcomponents
BrowsePath References NodeClass BrowseName DataType TypeDefinition Other
2:Identification0:HasPropertyVariable2:Model0:LocalizedText0:PropertyTypeM, RO
2:Identification0:HasPropertyVariable2:DeviceClass0:String0:PropertyTypeM, RO
3:MachineryBuildingBlocks0:HasAddInObject3:MachineryItemState3:MachineryItemState_StateMachineTypeM
3:MachineryBuildingBlocks0:HasAddInObject3:MachineryOperationMode3:MachineryOperationModeStateMachineTypeM

The DeviceClass Property shall have the value “Dosing System”.

The components of the DosingSystemType have additional references which are defined in Table 3.

Table 3 – DosingSystemType Additional References
SourceBrowsePath Reference Type Is Forward TargetBrowsePath
3:MachineryBuildingBlocks0:HasAddInTrue2:Identification

7.2.1 Machine State and Operation Mode

To provide the machine state, this specification uses the AddIn MachineryItemState from OPC 40001-1. Different Methods defined in this specification non-exclusively trigger state transitions, meaning that the server can also trigger these transitions in other ways (e.g. HMI input, control logic…):

EnableDevice (defined in 8.5) triggers the transition from NotAvailable to NotExecuting by e.g. switching on the drives of the device. NotExecuting means, the dosing device is ready for dosing and waiting for a dosing signal.

DisableDevice (defined in 8.6) triggers the transition from any state to NotAvailable by e.g. switching off the drives of the device. Further SubStates like e.g. “sleep”, “energy saving”, “eco mode” or “off” are not defined in this specification.

StartDosing (defined in 8.7) triggers the transition from NotExecuting to Executing if RemoteControlActivated (defined in Error! Reference source not found.) is in mode “OPC UA” (2). If not, the transition is performed by the server.

The transition from Executing state to any other state can be triggered in different ways depending on the application, e.g. automatically by the server in IMM application after each cycle or by the methods StopDosing or StopDosingAfterCycle in case of continuous dosing.

Figure 3 gives an overview of the machine state, transitions and methods.

Figure 3 – MachineryItemState Overview

For the operation modes, the MachineryOperationMode state machine is used without changes:

Figure 4 – MachineryOperationMode Overview