Re: Dynamic user limits in softMotor

["Mooney, Tim M. via Tech-talk" <tech-talk at aps.anl.gov>]

Hi Laurenz,

In the line

field(DHLM,"$(IOC):$(MaxPower).VAL CP MS")

you're treating DLHM as a link field.  It is not a link field; it can only hold a value.  You must arrange for another record (an ao, maybe) to read the value $(IOC):$(MaxPower).VAL and write it to $(IOC):$(powerMotor).DHLM.

Tim Mooney (mooney at anl.gov) (630)252-5417
Beamline Controls Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab

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From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Laurenz Rettig via Tech-talk <tech-talk at aps.anl.gov>
Sent: Friday, February 5, 2021 4:45 PM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Dynamic user limits in softMotor

 

Hi,

I've set up a softMotor record that converts between coordinate systems
according to some user-definable parameters according to some soft-ioc
ai records using a CALC record. That works all nice and pretty, however
what I did not get to work is to also set the soft-limits of the
softMotor dynamically to the corresponding ai record values.

This is my Soft-Motor and ai-record definition:

record(motor,"$(IOC):$(powerMotor)")
{
    field(DTYP,"Soft Channel")
    field(OUT,"$(IOC):$(convertPowerToWp).A  PP MS")
    field(RDBL,"$(IOC):$(convertWpToPower).VAL  NPP MS")
    field(URIP,"Yes")
    field(STOO,"$(IOC):$(wpMotor).STOP  PP MS")
    field(DINP,"$(IOC):$(wpMotor).DMOV  NPP MS")
    field(MRES,0.001)
    field(RRES,1)
    field(PREC,3)
    field(DHLM,"$(IOC):$(MaxPower).VAL CP MS")
    field(DLLM,"$(IOC):$(MinPower).VAL CP MS")
    field(TWV,".1")
    field(RTRY,"0")
    field(EGU,"W")
}

record(ai,"$(IOC):$(MinPower)")
{
    info(autosaveFields, "VAL")
    field(DESC,"Minimum Power")
    field(VAL,"0")
    field(FLNK,"$(IOC):$(convertWpToPower) PP MS")
    field(EGU,"W")
}

record(ai,"$(IOC):$(MaxPower)")
{
    info(autosaveFields, "VAL")
    field(DESC,"Maximum Power")
    field(VAL,"1")  
    field(FLNK,"$(IOC):$(convertWpToPower) PP MS")
    field(EGU,"W")
}

And the errors I get:

Can't set "simManip:Pump:Power.DHLM" to "simManip:Pump:MaxPower.VAL CP
MS" No digits to convert
Can't set "simManip:Pump:Power.DLLM" to "simManip:Pump:MinPower.VAL CP
MS" No digits to convert

I would appreciate any advice on this.

Thanks, Laurenz

--
Dr. Laurenz Rettig
Fritz Haber Institute of the Max Planck Society
Department of Physical Chemistry
Dynamics of Correlated Materials
Faradayweg 4-6
14195 Berlin, Germany

phone: +49-(0)30-8413 5225
email: rettig at fhi-berlin.mpg.de