[Dsg-mvt] MVT with premix in hall B

[Nathan Baltzell]

Sounds like it will be best if Quentin can provide another bit to read whether it’s trying to flow gas or not.  The START/STOP buttons don’t have feedback from the PLC.

-Nathan


> On Nov 13, 2017, at 12:42, Brian Eng <beng at jlab.org> wrote:
> 
> It's close to what I was looking for, but not quite it.
> 
> It sounds like that could go bad if the flows don't match (i.e. there is a leak in the detector), but that's not the same thing as them wanting flow or not.
> 
> I was hoping there was something that was on/off indicating we should be sending mixed gas or not.
> 
> ----- Original Message -----
>> From: "Nathan Baltzell" <baltzell at jlab.org>
>> To: "BERTRAND Quentin" <Quentin.BERTRAND at cea.fr>
>> Cc: "Brian Eng" <beng at jlab.org>, "mdefurne" <mdefurne at jlab.org>, "Guillaume Christiaens" <guillaum at jlab.org>,
>> dsg-mvt at jlab.org
>> Sent: Monday, November 13, 2017 12:42:34 PM
>> Subject: Re: [Dsg-mvt] MVT with premix in hall B
> 
>> Thanks Quentin,
>> 
>> I think that might be what Brian wants.  Combined with testing the .STAT field
>> for READ error (value = 3).
>> 
>> -Nathan
>> 
>> 
>>> On Nov 13, 2017, at 12:36, BERTRAND Quentin <Quentin.BERTRAND at cea.fr> wrote:
>>> 
>>> Hi Nathan,
>>> 
>>> FLOW_STAT means that IN_FLOW and OUT_FLOW corresponds to the SETPOINT when it is
>>> 1.
>>> 
>>> Quentin
>>> ________________________________________
>>> De : Nathan Baltzell [baltzell at jlab.org]
>>> Envoyé : lundi 13 novembre 2017 18:02
>>> À : Brian Eng
>>> Cc : mdefurne; Guillaume Christiaens; BERTRAND Quentin; dsg-mvt at jlab.org
>>> Objet : Re: [Dsg-mvt] MVT with premix in hall B
>>> 
>>> Quentin,
>>> 
>>> What exactly does FLOW_STAT mean?   Looks like it’s at word 32, 11th bit.
>>> 
>>> -Nathan
>>> 
>>> {P,              R,             PORT,   OFFSET, MASK,       ZNAM,   ONAM,   ZSV,
>>> OSV,        SCAN}
>>> {B_DET_BMT_GAS_, FLOWDIFF_FLT,  R505,   32,     1,          Ok,     Fault,
>>> NO_ALARM,   MAJOR,      "I/O Intr"}
>>> {B_DET_BMT_GAS_, INFLOW_FLT,    R505,   32,     2,          Ok,     Fault,
>>> NO_ALARM,   MAJOR,      "I/O Intr"}
>>> {B_DET_BMT_GAS_, OVRFLOW_FLT,   R505,   32,     4,          Ok,     Fault,
>>> NO_ALARM,   MAJOR,      "I/O Intr"}
>>> # FLOW_START    8
>>> # FLOW_STOP     16
>>> # <empty>       32
>>> # <empty>       64
>>> # <empty>       128
>>> {B_DET_BMT_GAS_, GEN_WRN,       R505,   32,     256,        Ok,     Fault,
>>> NO_ALARM,   MAJOR,      "I/O Intr"}
>>> {B_DET_BMT_GAS_, GEN_FLT,       R505,   32,     512,        Ok,     Fault,
>>> NO_ALARM,   MAJOR,      "I/O Intr"}
>>> {B_DET_BMT_GAS_, FLOW_STAT,     R505,   32,     1024,       Fault,  Ok,
>>> MAJOR,      NO_ALARM,   "I/O Intr"}
>>> {B_DET_BMT_GAS_, PRES_WRN,      R505,   32,     2048,       Ok,     Fault,
>>> NO_ALARM,   MAJOR,      "I/O Intr"}
>>> {B_DET_BMT_GAS_, INFLOW_WRN,    R505,   32,     4096,       Ok,     Fault,
>>> NO_ALARM,   MAJOR,      "I/O Intr"}
>>> {B_DET_BMT_GAS_, OVRFLOW_WRN,   R505,   32,     8192,       Ok,     Fault,
>>> NO_ALARM,   MAJOR,      "I/O Intr"}
>>> {B_DET_BMT_GAS_, FLOWDIFF_WRN,  R505,   32,     16384,      Ok,     Fault,
>>> NO_ALARM,   MAJOR,      "I/O Intr"}
>>> {B_DET_BMT_GAS_, PRES_FLT,      R505,   32,     32768,      Ok,     Fault,
>>> NO_ALARM,   MAJOR,      "I/O Intr”}
>>> 
>>> 
>>> 
>>>> On Nov 13, 2017, at 08:58, Brian Eng <beng at jlab.org> wrote:
>>>> 
>>>> Yes, a normally off/false boolean(s) that indicates if any of the MVT detectors
>>>> need gas would be what I'm looking for.
>>>> 
>>>> The *_INFLOW_SET PVs will work just fine for calculating the mixing flow.
>>>> 
>>>> Basically I'm trying to see if there is something that will handle the failure
>>>> case right now, the PLC is offline, but the PVs still have numbers in them. So
>>>> right now if we had gas it would be trying to flow it despite the gas not
>>>> actually being required.
>>>> 
>>>>> On Nov 10, 2017, at 7:36 PM, Nathan Baltzell <baltzell at jlab.org> wrote:
>>>>> 
>>>>> 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