Re: scalcout EPICS Record Error

[Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>]

Hi Varuna,

You should look at the scalcout record documentation here:

https://epics-modules.github.io/calc/sCalcoutRecord.html

Your calc _expression_ is this:

 field(CALC, "IF(STRLEN(A)==0, 0, VAL(A))") 

That syntax is incorrect.

I think the CALC field should be this, but I have not tested it.

 field(CALC, "LEN(A)==0 ? 0 : DBL(A)") 

Mark

---

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Varuna Crishan Meddage via Tech-talk <tech-talk at aps.anl.gov>
Sent: Thursday, March 19, 2026 5:28 PM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: scalcout EPICS Record Error

 

Hi,

I have following record instance defined in my .db file. 

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

record(stringin, "$(acc):$(sys)_$(group):nsChannel$(channel_id)Vrms")

{

  field(SCAN, "10 second")

  field(DTYP, "Snmp")

  field(INP, "@$(HOST) $(COMMUNITY) $(W)::nsChannel$(channel_id)Vrms.0 STRING: 100")

  field(DESC, "Channel $(channel_id) Vrms")

  field(FLNK, "$(acc):$(sys)_$(group):calc_nsChannel$(channel_id)Vrms")

}

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

I want to convert the string value of above record  to a numerical value using a scalcout EPICS record. For that purpose, I defined the following scalcout record which caused the runtime errors as pasted below. (Here I want to output 0 if string value is empty  and numerical value otherwise)

========================= SCALCOUT RECORD =============================

record(scalcout, "$(acc):$(sys)_$(group):calc_nsChannel$(channel_id)Vrms")

{

  field(INPA, "$(acc):$(sys)_$(group):nsChannel$(channel_id)Vrms PP")

  field(CALC, "IF(STRLEN(A)==0, 0, VAL(A))") 

  field(PREC, "2")

  field(EGU, "V")

  field(DESC, "Channel $(channel_id) Vrms")

}

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

==================================== ERROR MESSAGE ===============================

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel1Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel2Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel3Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel4Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel5Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel6Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel7Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel8Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel9Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel10Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel11Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel12Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel13Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel14Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel15Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel16Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel17Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel18Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel19Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel20Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel21Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel22Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel23Vrms

recGblRecordError: scalcout:init_record Error (514,3) PV: PIP2:TIME_CTRL_GPS:calc_nsChannel24Vrms

PIP2:TIME_CTRL_GPS:calc_nsChannel1Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel2Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel3Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel4Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel5Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel6Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel7Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel8Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel9Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel10Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel11Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel12Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel13Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel14Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel15Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel16Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel17Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel18Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel19Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel20Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel21Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel22Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel23Vrms DSET write does not exist

PIP2:TIME_CTRL_GPS:calc_nsChannel24Vrms DSET write does not exist

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

Any solutions solve this problem ?

Thanks

Varuna Meddage