Job Order Method Return Status Codes – OPC UA for ISA-95

B.2 Job Order Method Return Status Codes

The job order methods’ return status codes are defined as a bit map in a UInt64 variable, allowing for multiple codes to be defined at the same time. The codes and bitmap positions are defined in Table 95. In the OPC format, the bit positions start at bit 0 for the least significant digit.

Note: In case the ReturnStatus should be provided, the Method call cannot return a BAD StatusCode (then no return arguments are provided) but either the GOOD StatusCode, or an UNCERTAIN StatusCode (when the Method call was not successful).

Table 95 – ISA-95 Methods Return Status Codes

Bit Position	Description	Notes
0	No Error	If bit 0 set (UInt64 value = 1) then there are no errors. This is returned on all successful method calls.
1	Unknown Job Order ID	The Job Order ID is unknown by the Information Receiver/Provider
3	Invalid Job Order Status	The Job Order status is unknown.
4	Unable to accept Job Order	The Job Order cannot be accepted
5-31	Reserved
32	Invalid request	The request is invalid due to an unspecified reason.
33-63	Implementation-specific	These values are reserved for use in specific implementations and should be defined in the implementation specification.