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<== Date ==> <== Thread ==>

Subject: Re: Reset integral pv and store it
From: Maren Purves <m.purves@eaobservatory.org>
To: tech-talk@aps.anl.gov
Date: Fri, 31 Mar 2017 14:09:48 -1000
On 03/31/17 08:21, Ralph Lange wrote:
On March 31, 2017 4:47:43 PM GMT+02:00, Miguel
<miguel.b.fernandes@gmail.com> wrote:

    Hi all,

    I have a PV that is an integral over the day. I would like at the
    end of the day(certain timestamp) to store it to the DB (maybe in
    another PV) and after that reset the integral.

    I would also like that if epics restarts the intergal will initiate
    with the most recent value in the DB.

    My DB is with mysql with the CSS archive engine.

    my current integral PV:

    record(calc, "$(user):DLI"){
        field(DESC, " Daily light Integral (mol.m-2.day-1)")

        field(INPA, "$(user):Lum1")
        field(INPB, "$(user):DLI")
        field(CALC, "A*1e-6+B")

        field(SCAN, "1 second")
        field(EGU, "DLI")
        #field(PREC, "6")
        #field(ADEL, "10")

        field(LOPR, "0")
        field(HOPR, "1000")    #High Operating Range
    }

    Thanks a lot,
    MiguelB


Yet another idea:
The stringin record has support for strftime formats. If you use that to
create a six digit hhmmss number, you can use a calcout record to e.g.
check for <10 and process a seq record on the 1->0 edge to do the
integral reset sequence.

We have records that keep minima and maxima (so, it is slightly
different) for the time since the beginning of the (previous, when
you get to the next day) which I reset with a cron job at 18:00
using cau with an input file. Something like that may work here too.

Maren


References:
Reset integral pv and store it Miguel
Re: Reset integral pv and store it Ralph Lange

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