Experimental Physics and
Industrial Control System

Donny Domagoj Cosic via Tech-talk <tech-talk at aps.anl.gov> · Wed, 03 Jun 2020 16:03:02 +0200

Hi Mark,

Yes!! That is what I was trying to accomplish, with your example I now

understand how the OCAL field is used.

Thank you very much.

Donny

---
Donny Domagoj Cosic
 Institut Ruđer Bošković, Bijenička cesta 54, 10000 Zagreb, Croatia

Dana 03.06.2020 15:43, Mark Rivers via Tech-talk je napisao(la):

Hi Danny,

Now I think I understand what you want to do.  You want to write B if
and only if A==10?

I think this will do what you want:

record(calcout, "Name"){
    field(INPA, "In_A")
    field(INPB, "In_B")
    field(CALC, "A==10")

    field(OCAL, "B"

    field(OOPT, "When Non-zero")

    field(DOPT, "Use OCAL")

    field(OUT, "Out")
}

The CALC is now just A==10.  OOPT tests if the CALC is non-zero (i.e.
True) and only writes to the output if it is.  OCAL determines what is
written, and it is set to B.  DOPT says to write OCAL, not CAL, to the
output link.

Mark

________________________________
From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Donny
Domagoj Cosic via Tech-talk <tech-talk at aps.anl.gov>
Sent: Wednesday, June 3, 2020 8:32 AM
To: tech-talk at aps.anl.gov
Subject: Re: Update a record at a specific time

Hi Mark,

Thank you for your response,
I was referring to the CALC field of the calcout record:

record(calcout, "Name"){
    field(INPA, "In_A")
    field(INPB, "In_B")
    field(CALC, "A==10?B")
    field(OUT, "Out")
}

the line "field(CALC, "A==10?B")" is not valid because there is no else

statement ie. "A==10?B:0". If i understood your response correctly,

this

can be accomplished by setting the OOPT field to "Transition To

Non-zero" and the record will only write the output when it is non

zero.

Regards,
Donny

---
Donny Domagoj Cosic
  Institut Ruder Boskovic, Bijenicka cesta 54, 10000 Zagreb, Croatia

Dana 03.06.2020 14:03, Mark Rivers via Tech-talk je napisao(la):

Additionally, a simple follow up question that I
am not able to solve in a simple way. Is there a simple way to create
a
"if" statement without the "else" part. As in, I would like the OUT
record processed only then the "if" condition is met.

I'm not positive I understand the question.  But if you can make your
calculation "if" return 0 or non-zero then the calcout record has an
OOPT field that can be either "Transition To Zero" or "Transition To
Non-zero" (among other choices).  That will write the output only
under the specified condition.  It also has a DOPT field that lets you
write a different value from the result of the calculation if you set
it to "Use OCAL" rather than "Use CAL".

Mark

________________________________
From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Donny
Domagoj Cosic via Tech-talk <tech-talk at aps.anl.gov>
Sent: Wednesday, June 3, 2020 6:45 AM
To: tech-talk at aps.anl.gov
Subject: Update a record at a specific time

Hello,

For archiving purposes I am trying to record a value from a PV

everyday

at a specific time. I accomplished similar things using a Soft
Timestamp
record when a specific date/time field updates. ie:

record(stringin, "TeslaMeters:$(position):TimeStamp"){
     field(DTYP, "Soft Timestamp")
     field(PINI, "YES")
     field(INP,  "@%d")
}

record(calcout, "TeslaMeters:$(position):Calc"){
    field(INPA, "TeslaMeters:$(position):TimeStamp CP")
    field(INPB, "TeslaMeters:$(position)")
    field(CALC, "B")
    field(OUT, "TeslaMeters:$(position):Midnight PP")
}

record(ai, "TeslaMeters:$(position):Midnight")
{
     field(PREC, "3")
     field(EGU,  "Tesla")
     field(PINI, "YES")
}

Could I use a similar strategy to compare a time string generated by
the
Soft Timestamp? I see that there is a scalcout record, but i was not
able to get it to work. Additionally, a simple follow up question that
I

am not able to solve in a simple way. Is there a simple way to create

a

"if" statement without the "else" part. As in, I would like the OUT
record processed only then the "if" condition is met.

Thank you,
Donny

--
Donny Domagoj Cosic
  Institut Ruder Boskovic, Bijenicka cesta 54, 10000 Zagreb, Croatia

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System