Experimental Physics and
Industrial Control System

"Meddage, Varuna via Tech-talk" <tech-talk at aps.anl.gov> · Tue, 1 Nov 2022 16:15:37 +0000

Thank you.

________________________________
From: Kasemir, Kay <kasemirk at ornl.gov>
Sent: Tuesday, November 1, 2022 11:13:38 AM
To: tech-talk at aps.anl.gov; Meddage, Varuna
Subject: Re: calc type record question

The length of the CALC field is limited something around 80 characters.
Try to simplify your expression, for example by removing some parentheses that are good for readability but not strictly necessary.
________________________________
From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Meddage, Varuna via Tech-talk <tech-talk at aps.anl.gov>
Sent: Tuesday, November 1, 2022 11:08 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: [EXTERNAL] calc type record question

Hi,

I have following "calc" type record in one of my .db files.

===============================================================

record(calc,"$(detector)_wib$(crate)0$(wib)/calc")
{
      field(SCAN,"5 second")
      field(CALC,"((A>=4.6&&A<=5.2)&&(B>=4.6&&B<=5.2)&&(C>=1.75&&C<=1.80)&&(D>=3.2&&D<=3.4)&&(E>=0.7&&E<=2.0))?1:0")
      field(INPA,"$(detector)_wib$(crate)0$(wib)/vcc")
      field(INPB,"$(detector)_wib$(crate)0$(wib)/v1")
      field(INPC,"$(detector)_wib$(crate)0$(wib)/v2")
      field(INPD,"$(detector)_wib$(crate)0$(wib)/v3")
      field(INPE,"$(detector)_wib$(crate)0$(wib)/v4")
      field(DESC,"")
      field(HIHI,"")
      field(HIGH,"")
      field(LOW,"")
      field(LOLO,"")
      field(MDEL,"-1")
      field(ADEL,"-1")
      field(OOPT,"Every Time")
      field(PREC,"6")
}

===============================================================

When I run the EPICS, then I get an error message saying "String is too long" complaining about the expression, I inserted inside the "CALC" field in this record. But when I reduced the number of input PVs of this record from 5 to 4 and rewrite the expression inside "CALC" field, then there is no error.

Is there maximum number of input PVs, that I can use inside a "calc" type record ?

Any help to understand this issue is highly appreciated.

Thanks

Varuna Meddage

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System