The WorkMasterID field of the 6:ISA95JobOrderDataType contains the information about the work master (e.g., the cutting tool file). The field ID is an identification of the work master. This should be used to identify a work master across different OPC UA Servers and must be unique in its scope (e.g., company unique).

This specification uses the 0:FileSystem folder to manage (e.g., store/retrieve files) the work master files on the server. To connect the WorkMasterID with the file additional predefined key-value pairs for 6:ISA95WorkMasterDataType.Parameter are defined in Table 20.

Table 20 – Predefined WorkMaster Parameters

ID	DataType of Value	Description	EngineeringUnits	Subparameters
LocalPath	String	Contains the file path on the OPC UA server. This must be identical with the relative path of the BrowsePath.	-	-
FileNodeId	0:NodeId	Contains the NodeId of the object of the file.	-	-
FileFormat	FileFormatDataType	Defines the file format of the work master file. This is used to ensure compatibility between the work master and the machine.	-	-

Note: Example of the LocalPath could be “/Directory1/FileA” with the corresponding BrowsePath as (StartingNode “ns=1;s=FileSystem”; RelativePath: “Directory1/FileA”).It is recommended that the local file system also has a directory “../Directory1/FileA”.

Note: A restart may change the NodeId of the file. So it is recommended to check the FileNodeId before using the file in a WorkMaster. If possible, use the LocalPath instead.

Note: The LocalPath must be used in a WorkMaster and the other Parameters are optional.