Re: Block CAPUT to not be able to modify PV value

["Johnson, Andrew N. via Tech-talk" <tech-talk at aps.anl.gov>]

Hi Adrián,

On Jul 15, 2021, at 12:45 AM, Adrian Martinez <adrian.martinez at sevensols.com> wrote:

I knew the DISP field but I need to disable UCrTcrLimitUsSet and UCrTcrLimitUsRd when StartUpOn =! 1, not all the time.

Is it possible with DISP?

Yes, you have an EPICS database at your disposal which was designed to do that kind of thing. You would need to add two records, one to invert the value from StartUpOn (since it’s 0 when you want to disable those records) and the second to copy the result into the DISP fields of the records to be disabled. I would probably use a dfanout for the latter, but a seq record would also work. Something like this should do it:

record(calc, "$(user):UCrTcrDISP")

{

  field(CALC, "!A")

  field(INPA, "$(user):StartUpOn CP")

  field(FLNK, "$(user):UCrTcrDisable")

}

record(dfanout, "$(user):UCrTcrDisable")

{

  field(DOL, "$(user):UCrTcrDISP")

  field(OMSL, "closed_loop")
  field(SELM, "All")
  field(OUTA, "$(user):UCrTcrLimitUsSet.DISP MS")

  field(OUTB, "$(user):UCrTcrLimitUsRd.DISP MS")

}

The CP flag on the calc INPA link will cause it to process whenever the value of StartUpOn changes. Its forward-link field will then trigger the dfanout to copy the inverted value to the DISP fields of the other records, thus preventing them from being modified by any CA clients while StartUpOn is zero (although DISP will not prevent those records from processing if they get triggered by some other means). You can disable up to 6 more records with this if you want, using the dfanout links OUTC through OUTH.

- Andrew

El mié, 14 jul 2021 a las 16:04, Johnson, Andrew N. (<anj at anl.gov>) escribió:

Hi Adrian,

Take a look at the DISP field (described here), when non-zero it disables puts to any field of the record except for the DISP field itself.

- Andrew

On Jul 14, 2021, at 8:59 AM, Adrian Martinez via Tech-talk <tech-talk at aps.anl.gov> wrote:

Hello, 

I need to block the setting function for some PVs. I was using SDIS and DISV fields:

record(ao, "$(user):UCrTcrLimitUsSet")
{
field(DTYP, "asynInt32")
field(OUT,  "@asyn($(PORT),$(ADDR),$(TIMEOUT))ucr_tcr_us")
field(VAL,  "0")
field(EGU,  "us")
field(HOPR, "10000")
field(LOPR, "0")
field(DRVH, "10000")
field(DRVL, "0")
field(SDIS, "$(user):StartUpOn.VAL CP MS")
field(DISV, "0")
info(autosaveFields, "VAL")
}

record(calc, "$(user):UCrTcrLimitUsRd")
{
field(CALC, "((A / 10^-6) / 300000000)")
field(INPA, "$(user):UCrTcrLimRd.VAL CP MS")
field(EGU,  "us")
field(SDIS, "$(user):StartUpOn.VAL CP MS")
field(DISV, "0")
}

This only works for the graphical user interface CSS (I am not able to modify the Pv value in the gui) but, if I use CAPUT, I can modify the PV value. 

Is there any way to completely block setting function?

Thanks in advance, Adrián.

--

Adrián Martínez Embedded Software Engineer	Seven Solutions
Mail: adrian.martinez at sevensols.com www.sevensols.com

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Adrián Martínez Embedded Software Engineer	Seven Solutions
Mail: adrian.martinez at sevensols.com www.sevensols.com

 This e-mail and any materials attached hereto, including, without limitation, all content hereof and thereof are confidential and proprietary to Seven Solutions,S.L and/or its affiliates, and are *confidential*. Without the prior written consent of Seven Solutions, this content may not (i) be disclosed to any third party, (ii) be reproduced, modified or otherwise used by anyone other than current employees of Seven Solutions or its affiliates. If you are not the intended recipient or if this message has been received in error, please notify us immediately via e-mail and delete it.

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Complexity comes for free, simplicity you have to work for.