Experimental Physics and
Industrial Control System

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <2023> 2024	Index	1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <2023> 2024
<== Date ==>		<== Thread ==>

Subject:	Re: scalcout and calc yielding different results
From:	"Marco A. Barra Montevechi Filho via Tech-talk" <tech-talk at aps.anl.gov>
To:	"Mooney, Tim M." <mooney at anl.gov>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date:	Wed, 13 Sep 2023 14:55:00 +0000

Thanks for the hint, Tim!

I did this and still got different results. The final workaround was to make a calc record get the value from CURRENT and pass a simplified value to scalcout, which decided which engineering unit to use:

record(ai, "CURRENT"){}

record(calc, "CALC") {

field(INPA, "CURRENT CP")

field(B, "1e-12")

field(C, "1e-9")

field(D, "1e-6")

field(E, "1e-3")

field(CALC, "F:=ABS(A);F<C?1:(F<D?2:(F<E?3:4))")

field(PREC, "4")

field(PINI, "YES")

field(SCAN, "Passive")

}

record(calc, "CALC2"){

field(INPA, "CURRENT CP")

field(B, "1e-9")

field(BB, "pA")

field(C, "1e-6")

field(CC, "nA")

field(D, "1e-3")

field(DD, "uA")

field(E, "1")

field(EE, "mA")

field(CALC, "A:=ABS(A);A<B?1:(A<C?2:(A<D?3:4))")

field(PINI, "YES")

field(SCAN, "Passive")

}

record(scalcout, "CURRENTSCALEDUNIT"){

field(INPA, "CALC2 CP")

field(B, "1e-9")

field(BB, "pA")

field(C, "1e-6")

field(CC, "nA")

field(D, "1e-3")

field(DD, "uA")

field(E, "1")

field(EE, "mA")

field(CALC, "A:=ABS(A);A=1?BB:(A=2?CC:(A=3?DD:EE))")

field(OUT, "CURRENTSCALED.EGU")

field(OOPT, "Every Time")

field(PINI, "YES")

field(SCAN, "Passive")

}

record(calc, "CURRENTSCALED"){

field(INPA, "15")

field(CALC, "A")

field(PINI, "YES")

field(SCAN, "Passive")

}

Doesnt feel elegant, but it works...

From: Mooney, Tim M. <mooney at anl.gov>
Sent: 12 September 2023 18:49
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>; Marco A. Barra Montevechi Filho <marco.filho at lnls.br>
Subject: Re: scalcout and calc yielding different results

Hi Marko,

That's not the way you initialize the value of a scalcout-record input field.

Instead of 'field(INPB, "1e-9")', you want 'field(B, "1e-9")' and so on.

Tim Mooney (mooney at anl.gov) (630)252-5417
Beamline Controls Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Marco A. Barra Montevechi Filho via Tech-talk <tech-talk at aps.anl.gov>
Sent: Tuesday, September 12, 2023 3:53 PM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: scalcout and calc yielding different results

Hi all. I happened to bump into an interesting problem. Im using calc and scalcout records to translate a very small current measurement into a more convenient unit of measurement.

After having trouble with the software showing the wrong measurement unit, i came to the conclusion that for some reason, although calc and scalcout are both double types, they seem to have different precision for comparisons.

I have the following example, made to get a very small amount of current in Amps and decide to either display it in pA, nA, uA, etc.:

record(ai, "CURRENT"){}

record(calc, "CALC") {

field(INPA, "CURRENT CP")

field(INPB, "1e-12")

field(INPC, "1e-9")

field(INPD, "1e-6")

field(INPE, "1e-3")

field(CALC, "F:=ABS(A);F<C?1:(F<D?2:(F<E?3:4))")

field(PREC, "4")

field(PINI, "YES")

field(SCAN, "Passive")

}

record(scalcout, "CURRENTSCALEDUNIT"){

field(INPA, "CURRENT CP")

field(PREC, "15")

field(INPB, "1e-9")

field(BB, "pA")

field(INPC, "1e-6")

field(CC, "nA")

field(INPD, "1e-3")

field(DD, "uA")

field(INPE, "1")

field(EE, "mA")

field(CALC, "A:=ABS(A);A<B?BB:(A<C?CC:(A<D?DD:EE))")

field(OUT, "CURRENTSCALED.EGU")

field(OOPT, "Every Time")

field(PINI, "YES")

field(SCAN, "Passive")

}

record(calc, "CURRENTSCALED"){

field(INPA, "15")

field(CALC, "A")

field(PINI, "YES")

field(SCAN, "Passive")

}

However, if you caput CURRENT 9.94e-10 you will see CURRENTSCALEDUNIT.SVAL=nA and CALC.VAL=1, meaning that for the calc record, 9.94e-10<1e-09 is True but for the scalcout this is false.

Is this expected?

Thanks,

Marco

Aviso Legal: Esta mensagem e seus anexos podem conter informações confidenciais e/ou de uso restrito. Observe atentamente seu conteúdo e considere eventual consulta ao remetente antes de copiá-la, divulgá-la ou distribuí-la. Se você recebeu esta mensagem por engano, por favor avise o remetente e apague-a imediatamente.

Disclaimer: This email and its attachments may contain confidential and/or privileged information. Observe its content carefully and consider possible querying to the sender before copying, disclosing or distributing it. If you have received this email by mistake, please notify the sender and delete it immediately.

References:: scalcout and calc yielding different results Marco A. Barra Montevechi Filho via Tech-talk; Re: scalcout and calc yielding different results Mooney, Tim M. via Tech-talk

Navigate by Date:: Prev: CA Client program throwed "pthread_create error" wzhy via Tech-talk; Next: how to configure compiler version timesir via Tech-talk; Index: 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <2023> 2024
Navigate by Thread:: Prev: Re: scalcout and calc yielding different results Mooney, Tim M. via Tech-talk; Next: CA Client program throwed "pthread_create error" wzhy via Tech-talk; Index: 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 <2023> 2024

ANJ, 13 Sep 2023

· Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System