This specification standardizes some of those parameters, which are application-specific from the view of OPC 10031-4.

In Table 19, predefined key-value pairs for 2:JobOrderParameters and 2:JobResponseData is provided. The table indicates, in which data structure the key-value pair is expected to be used. An “X” in “In” indicates it may be used in 2:JobOrderParameters an “X” in “Out” indicates it may be used in 2:JobResponseData.

Table 19 – Predefined JobOrderParameters and JobResponseData

ID	DataType of Value	Description	EngineeringUnits	Subparameters	In	Out
ReasonForSubState	ReasonDescriptionType	Provides an explanation for the current status of the job. This information may be used, for instance, to detail why the server is unable to perform a particular job.	-	-	x	x