Experimental Physics and
Industrial Control System

Hey Heinz,

I created a small test setup myself.
If you add
     field( DTYP, "Raw Soft Channel" )
to your ai record, it calculates VAL from RVAL.

The default is "Soft channel" which does not do conversion.

Cheers,
Florian


On 8/11/22 17:00, Heinz Junkes via Tech-talk wrote:

I probably didn't take something into account, but unfortunately I don't see what I did wrong.

I have modified the ai- record from dbExample1.db:

record(ai, "$(user):aiExample")
{
         field(DESC, "Analog input")
#       field(INP, "$(user):calcExample.VAL  NPP NMS")
         field(ASLO, "2")
         field(EGU, "Counts")
         field(HOPR, "20")
         field(LOPR, "0")
         field(HIHI, "16")
         field(HIGH, "6")
         field(LOW, "4")
         field(LOLO, "2")
         field(HHSV, "MAJOR")
         field(HSV, "MINOR")
         field(LSV, "MINOR")
         field(LLSV, "MAJOR")
}

and write into this record (RVAL) with a calcout record:

record(calcout, "$(user):dummOut") {
   field(INPA, "$(user):calcExample.VAL MS CP")
   field(CALC, "A")
   field(OUT , "$(user):aiExample.RVAL CP")
}

RVAL is also changed, but VAL remains 0:

(base) hactar:iocmyExample junkes$ camonitor junkes:aiExample.RVAL junkes:aiExample.VAL junkes:aiExample.ASLO
junkes:aiExample.RVAL          2022-08-11 16:52:57.014817 2 LOLO MAJOR
junkes:aiExample.VAL           2022-08-11 16:52:57.014817 0 LOLO MAJOR
junkes:aiExample.ASLO          2022-08-11 16:52:57.014817 2 LOLO MAJOR
junkes:aiExample.RVAL          2022-08-11 16:52:58.016001 3 LOLO MAJOR
junkes:aiExample.RVAL          2022-08-11 16:52:59.017708 4 LOLO MAJOR
junkes:aiExample.RVAL          2022-08-11 16:53:00.015190 5 LOLO MAJOR
junkes:aiExample.RVAL          2022-08-11 16:53:01.017940 6 LOLO MAJOR
junkes:aiExample.RVAL          2022-08-11 16:53:02.015414 7 LOLO MAJOR
junkes:aiExample.RVAL          2022-08-11 16:53:03.018187 8 LOLO MAJOR
junkes:aiExample.RVAL          2022-08-11 16:53:04.018058 9 LOLO MAJOR

In the record reference manual :

If the device support sets the RVAL field, the LINR field controls how this gets converted into engineering units and placed in the VAL field as follows:

1. RVAL is converted to a double and ROFF is added to it.
2. If ASLO is non-zero the value is multiplied by ASLO.
3. AOFF is added.

Danke,  for taking a look,
Heinz

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AG der Experimentalphysik I
Dr. Florian Feldbauer
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References:

ai - record unfortunately does not behave as I expect it to Heinz Junkes via Tech-talk

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