Valve signatures are files that contain high sample rate pressure profiles recorded during individual valve operations subsea exposed by the subsea system. There are cases where valve signatures are required to be transferred from the SPCS to either the DCS or external historian interfaces.
A Server that supports transferring the valve signature via OPC UA shall expose a FileObject as part of the Valve Object Instance via the HasSignature ReferenceType. The valve Signature will also be provided in the MDIS folder under the MDISInformation Object. File formats and specific information captured within the valve signature files are outside the scope of this specification and should be specified on a project basis.
The items required are provided as part the individual object types. This functionality is optional and covered in a separate profile.