[Dsg-mvt] MVT with premix in hall B

[Nathan Baltzell]

Hello All,

These EPICS pvs suffixed by SET are the setpoints used by the PLC when it is actually flowing gas.  And the START/STOP ones are control outputs from EPICS to the PLC.  I doubt any of those should be used for trying to understand the live status of the gas flow.

The pvs suffixed by INFLOW/OUTFLOW are readbacks on measured flows.  But I suspect Brian wants a boolean status for gas flow?  The FLT (fault) column on that screen may also be useful (see attached screenshot).  Depends on what logic you want here.  Also, it’s on my todo list to add a summary PV (on ‘OR’ of all faults) and add it to the overview screen for shift workers and alarms.  If that will be useful here, I’ll do it ASAP.  Or let’s define what exactly you want from EPICS for this and we’ll make it happen.

Quentin is the PLC expert on all this and defined the PLC-EPICS communications that Wesley wrote.

Ok, that is my understanding of things.

Cheers,
Nathan


P.S.  PLC appears to be offline currently, but:
https://hallbopi.jlab.org/webopi3.3/w?opi=CLAS12_Menu-web.opi
click CVT->BMTGas for live readings







> On Nov 10, 2017, at 6:43 PM, mdefurne <mdefurne at jlab.org> wrote:
> 
> Hi Brian,
> 
> I do not think that B_DET_FMT_GAS_INFLOW_SET, B_DET_FTT_GAS_INFLOW_SET and B_DET_BMT_GAS_INFLOW_SET go to 0 when the "stop" button is pushed. Only the value B_DET_FTT/BMT/FMT_GAS_INFLOW go to 0 (or 0.1, 0.2). But it seems that there are values associated to the start/stop button (B_DET_FTT/BMT/FMT_GAS_FLOW_START and STOP). Maybe these values are just switched from 0 to 1 when you hit the dedicated button and could therefore indicate the status of the PLC. But this fact should be confirmed by Nathan or Quentin since it is pure assumption from me.
> 
> Kind regards,
> 
> Maxime
> 
> Le 10/11/2017 à 17:24, Brian Eng a écrit :
>> Hi Stephan,
>> 
>> Pablo and I terminated the cables that Hall B Mechanical ran this week (a few more need labels, but that's a minor issue).
>> 
>> We've started getting ready to deploy the software part, but I had a few questions regarding the functionality.
>> 
>> The plan was to get the flow from EPICS and match it with the cRIO (these appear to already exist).
>> 
>> Mix 1 (3 gas mixture) = B_DET_FMT_GAS_INFLOW_SET + B_DET_FTT_GAS_INFLOW_SET
>> Mix 2 (2 gas mixture) = B_DET_BMT_GAS_INFLOW_SET
>> 
>> I see there are already start/stop buttons on the CSS screen, but is there a PV that indicates what the status on the PLC is? The idea being if flow is stopped on the PLC we should stop the mix flow as well; or does the PVs referenced above go to 0 when the flow is stopped?
>> 
>> --
>> Brian Eng
>> Detector Support Group
>> 757-269-6018
>> 
>> ----- Original Message -----
>>> From: "Aune Stephan" <stephan.aune at cea.fr>
>>> To: "Marc McMullen" <mcmullen at jlab.org>, "mdefurne" <mdefurne at jlab.org>, "Brian Eng" <beng at jlab.org>, dsg-mvt at jlab.org,
>>> "Bob Miller" <rmiller at jlab.org>
>>> Cc: "burkert" <burkert at jlab.org>
>>> Sent: Tuesday, November 7, 2017 11:35:58 AM
>>> Subject: MVT with premix in hall B
>>> Hi All
>>> 
>>> For the MVT and FTT we will need gas to test the system.
>>> The idea is to start with the two premix bottles we have left, and an Argon
>>> bottle to rinse the new lines.
>>> This can give us ~10 days of test before mixing system comes in.
>>> 
>>> Matt is working on the lines in Hall B today, we are preparing for a MVT and FTT
>>> distribution racks leak test this afternoon in EEL. We will bring them back in
>>> Hall B end of the day or tomorrow.
>>> 
>>> For DSG, can we have one Ar and first premixed bottle outside hall B (gas
>>> building) for Friday?
>>> Then we can test MVT this weekend prior insertion in magnet.
>>> 
>>> Also when does mixing system will be ready?
>>> knowing the schedule will tell us how thrifty we must be on the two remaining
>>> premix bottle.
>>> 
>>> Thank you
>>> Stephan
>> _______________________________________________
>> Dsg-mvt mailing list
>> Dsg-mvt at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/dsg-mvt
> 

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