This section provides a file format definition for the valve signature files. It includes a file naming convention:
Filname:
‘Date_Time_ValveTagId’, where Date-Format: yyyyMMdd and Time-Format: HHmmss.
Time in filename is only to be used for file handling purposes. Accurate Valve-Signature time-stamp is given in TriggerTime variable.
Variables:
|
BrowsePath |
A browse path that uniquely identifies the valve in signature file (without namespace). |
Mandatory |
|
TagId |
TagId of the Valve |
Optional |
|
Description |
Valve description. |
Mandatory |
|
Command |
"open", "close", "partial-stroke" |
Mandatory |
|
TriggerTime |
Timestamp for signature, SEM time when valve movement started.In OPC UA DateTime (see OPC 10000-5 section 5.2.2.5 DateTime) the string should be in this format "1510835812.330" |
Optional |
|
Instrument |
Instrument data start. |
|
|
InstrumentId |
TagId or BrowseName for instrument. |
Mandatory |
|
InstrumentDescription |
Description. |
Mandatory |
|
EUrangeHigh |
High range for plot, may be different from actual instrument range.(example: for flow transmitter EUrangeHigh should correspond to valve volume not flow instrument max range) |
Optional |
|
EUrangeLow |
Low range for plot, may be different from actual sensor range. |
Optional |
|
EngineeringUnits |
Instrument Engineering unit, same unit as EngineeringUnits under ProcessVariable. |
Mandatory |
|
Samples |
Sample values. |
|
|
Time |
SEM time for sample.In OPC UA DateTime (see OPC 10000-5 section 5.2.2.5 DateTime)) the string should be in this format "1510835812.330" |
Mandatory |
|
Value |
Instrument sample value. |
Mandatory |
|
Fault |
Sensor fault. |
Optional |
Additional comments:
First instrument sample value may be earlier in time than TriggerTime, dependent on subsea vendor SEM configuration, to include a pre-operation sample in the plot.
The normative definition of the JSON schema is available in the file found here:
For the latest version:
https://reference.opcfoundation.org/files/Profile-Schema.json?u=http://opcfoundation.org/UA/MDIS