Experimental Physics and
Industrial Control System

Hi Andrew,

 

This channel is a soft PV. A subroutine in our application accepts a bitmask representing device status and calculates the worst-case status, encoded as below. We’re looking to add another status description, hence the need for more than 16 options.

 

record(mbbo, "$(DEV):STATMSG") {

  field(DESC, "Status Message - worst case")

  field(NOBT, "16")

  field(ZRST, "Good")

  field(ONST, "BCON Warning")

  field(TWST, "Offline")

  field(THST, "PAU Ctrl")

  field(FRST, "Turned Off")

  field(FVST, "Not Degaus'd")

  field(SXST, "Not Cal'd")

  field(SVST, "Feedback Ctrl")

  field(EIST, "PS Tripped")

  field(NIST, "DAC Error")

  field(TEST, "ADC Error")

  field(ELST, "Not Stdz'd")

  field(TVST, "Out-of-Tol")

  field(TTST, "BAD Ripple")

  field(FTST, "BAD BACT")

  field(FFST, "No Control")

  field(ZRSV, "NO_ALARM")

  field(ONSV, "MINOR")

  field(TWSV, "NO_ALARM")

  field(THSV, "MINOR")

  field(FRSV, "MAJOR")

  field(FVSV, "MINOR")

  field(SXSV, "MINOR")

  field(SVSV, "NO_ALARM")

  field(EISV, "MAJOR")

  field(NISV, "MAJOR")

  field(TESV, "MAJOR")

  field(ELSV, "MINOR")

  field(TVSV, "MAJOR")

  field(TTSV, "MINOR")

  field(FTSV, "MAJOR")

  field(FFSV, "NO_ALARM")

  field(OMSL, "closed_loop")

  field(FLNK, "$(DEV):UNAVAILGO")

  field(DOL, "$(DEV):STATCTRLSUB.W")

}

 

Thanks,

An Le

SLAC National Accelerator Laboratory

 

 

 

 

From: Andrew Johnson <anj at anl.gov>
Sent: Friday, April 21, 2023 11:31 AM
To: Le, An <anle at slac.stanford.edu>; tech-talk at aps.anl.gov
Subject: Re: mbbo with 32 choices

 

What kind of client are you wanting to use to control this channel? The Channel Access protocol only supports 16 choices for menu/enum fields.

The IOC internals and QSRV (PVAccess) should be able to handle up to 30 choices at the moment (DB_MAX_CHOICES in dbDefs.h) but I'm not aware how much if any testing has happened beyond 16 — the dbCommon STAT field does have more than 16 possible states though, so if your client can see the WRITE_ACCESS choice of a .STAT field it may work.

- Andrew

On 4/21/23 12:41 PM, Le, An via Tech-talk wrote:

Hello,

 

I’m looking for an mbbo-like record type that supports 32 choices instead of 16. Has anyone already written an implementation for this?

 

Thanks,

An Le

SLAC National Accelerator Laboratory

 

-- 

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

-- 
Complexity comes for free, Simplicity you have to work for.