PEARL Pressure Controller: Estimated Time to Reach Nominal Pressure

[JackEAllen]

As a: developer

I would like to replicate the existing functionality in the LabView VI for the Pearl Pressure controller, displaying inside the OPI device screen using DB logic if possible, or a script if not possible to estimate the time for the device to reach nominal pressure.

Acceptance Criteria

• DB logic or a script exists to calculate estimated time until nominal pressure is reached.
• Estimated time to reach nominal pressure displayed in OPI device screen.

Extra Information

This issue will likely be reliant on work completed as part of #6763 to interpret how the calculation was previously achieved.

Why it is needed?

• Functionality exists in LabView VI and should be replicated in IBEX GUI device screen for consistency.

Where required files/links are

• Manual: \\isis\shares\ISIS_Experiment_Controls\Manuals\PEARL Pressure Controller\PEARL handbook_v3_5.docx
• Labview Vi: C:\LabVIEW Modules\Instruments\PEARL\PEARL Pressure Cell Controller
• Please see conversation in PEARL: IOC & OPI for Pressure Controller #6040 to view a screenshot of LabView VI for reference.
• PEARL Pressure Controller Emulator: C:\Instrument\Apps\EPICS\support\PearlPressureController\master
• PEARL Pressure Controller IOC: C:\Instrument\Apps\EPICS\ioc\master\PEARLPC
• PEARL Pressure Controller OPI: C:\Instrument\Dev\ibex_gui\base\uk.ac.stfc.isis.ibex.opis\resources

[KathrynBaker]

Detail on the LabVIEW implementation (part of #6763):
The values come from the st command.

Actual Setpoint is the 13th section of the reply from st ($2.B as I read the protocol file)
Actual Pressure is the 15th section of the reply from st ($2.D as I read the protocol file)
Actual Rate is the 11th section of the reply from st ($1.K as I read the protocol file)
All converted to decimal values from string

The time is to reach is calculated as:
(Absolute of (Actual Setpoint - Actual Pressure)) ÷ (Actual Rate ÷ 60)

That gives the time in seconds which can then be displayed suitable (in hh:mm:ss in the LabVIEW code)

[Tom-Willemsen]

Already completed as part of an earlier ticket.