RE: Linking a HIGH and LOW field to a PV

["Arnold, Ned D." <nda@anl.gov>]

It is possible to define HIGH and LOW fields as CA links if you create your own custom record. The records in EPICS base ... as defined ... are not CA links.

  Ned

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From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of Bo Jakobsen [lister@f77.dk]
Sent: Tuesday, November 22, 2016 02:24 AM
To: tech-talk@aps.anl.gov
Subject: Re: Linking a HIGH and LOW field to a PV

Thanks for the input

I will try this,

It is still unclear to me if the problem is to get the ao record to process the value or if it is simply not possible to define the HIGH and LOW fields as CA links.

Best
    Bo

On 2016-11-21 15:12, Steiner, Mathias wrote:

The brute force approach would be to use a calcout...

 

record(calcout, "$(P):SUBCRYO_SET_LOW") {

  field(INPA, "$(P):SUBCRYO_SETP_MIN.VAL CP")
  field(CALC, “A”)

  field(OUT , "$(P):SUBCRYO_SETP_S.LOW PP")
}

..and similar for .HIGH.

 

It’s the opposite of elegant but it’ll work.

 

cheers -mathias

 

 

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Bo Jakobsen
Sent: Monday, November 21, 2016 09:01
To: tech-talk@aps.anl.gov
Subject: Linking a HIGH and LOW field to a PV

 

Hi

I am trying to get "limits" to work on a "Soft Channel" record.
The challenge is that I have the limit values in another record, and want to make a link between the two records.

I would therefore like to something like this:

record(ao, "$(P):SUBCRYO_SETP_S") {
  field(DESC, "Huginn Sub-cryostat system setpoint")
  field(DTYP, "Soft Channel")
  field(VAL, "300")
  field(PREC, "3")
  field(EGU, "K")
  field(PINI, "YES")
  field(HSV, "MINOR")
  field(LSV, "MINOR")
  field(LOW, "$(P):SUBCRYO_SETP_MIN.VAL CP")
  field(HIGH, "$(P):SUBCRYO_SETP_MAX CP")
}


which, however, does not work.
It this possible, and in that case how.

Thanks in advance.
    Bo