Re: calc type record question

["Kasemir, Kay via Tech-talk" <tech-talk at aps.anl.gov>]

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.

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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