Experimental Physics and
Industrial Control System

Mark Rivers via Tech-talk <tech-talk at aps.anl.gov> · Wed, 3 Jun 2020 13:43:11 +0000

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