Experimental Physics and
Industrial Control System

Luca Cavalli <[email protected]> · Thu, 14 Jul 2016 06:50:31 +0000

Hi Luca,

What you're doing is fine.  I'd use a bo record, but I don't think the choice really matters.

To reset the bi record, I'd use an output link from the aSub record, and I'd have that output link process the bi record, so that its VAL field gets posted, so clients can see it.  Yes, this will get the aSub record processed again.  There is an EPICS idiom for processing a record only on a rising or falling transition:

record(aSub, "$(SYS):$(MOD):COORD_CONVERTER") {
    field(SDIS, "$(SYS):$(MOD):CONVERT_CMD")
    field(DISV, "0")
    ...
}

Tim Mooney ([email protected]) (630)252-5417
Beamline Controls Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab

________________________________________
From: [email protected] [[email protected]] on behalf of Luca Cavalli [[email protected]]
Sent: Wednesday, July 13, 2016 7:18 AM
To: [email protected]
Subject: Trigger aSub record from bi record reflecting status

Dear all,

I have to perform a conversion of a set of coordinates using an aSub record.
I have set the SCAN field of the record to passive and any change in a bi record
($(SYS):$(MOD):CONVERT_CMD) triggers the processing.

This is an extract of the database:

record(bi, "$(SYS):$(MOD):CONVERT_CMD") {
  field(DESC, "Convert command.")
  field(PINI, "NO")
  field(UDF, "0")
  field(FLNK, "$(SYS):$(MOD):COORD_CONVERTER")
  field(VAL, "0")
  field(ZNAM, "DONE")
  field(ONAM, "CONVERT")
}

record(aSub, "$(SYS):$(MOD):COORD_CONVERTER") {
  field(INAM, "convAsubInit")
  field(SNAM, "convAsubProcess")
  field(FTA, "DOUBLE")
  field(INPA, "$(SYS):$(MOD):SRVY:RA_SET_POS PP")
  field(DESC, "Coordinate converter.")
  field(SCAN, "Passive")
  field(INPB, "$(SYS):$(MOD):SRVY:DEC_SET_POS PP")
  field(INPC, "$(SYS):$(MOD):SRVY:X_SET_POS PP")
  field(INPD, "$(SYS):$(MOD):SRVY:Y_SET_POS PP")
  field(INPE, "$(SYS):$(MOD):SRVY:Z_SET_POS PP")
  field(INPF, "$(SYS):$(MOD):SRVY:START_TIME PP")
  field(INPM, "$(SYS):$(MOD):CONVERT_CMD")
  field(FTB, "DOUBLE")
  field(FTC, "DOUBLE")
  field(FTD, "DOUBLE")
  field(FTE, "DOUBLE")
  field(FTF, "DOUBLE")
  field(FTM, "ENUM")
}

Is this the proper way to achieve this task?

How to reset the $(SYS):$(MOD):CONVERT_CMD value to 0 from the C code of the convAsubProcess function?

Does this change from 1 (CONVERT) to 0 (DONE) will trigger an additional call to convAsubProcess?

Thanks for your help.

Luca

________________________________

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System