Experimental Physics and
Industrial Control System

David,  Do you really want the record to refrain from processing,
or is it sufficient that it refrain from writing to hardware?
If you just want the record to write only *changes* to hardware,
you can do this in device support.  If you want it to not process,
then I'm pretty sure no record can do this without outside help.
If a record were to decide whether or not to process based on the
value written to it, putNotify would not work for that record.
(I know because I wrote a record that did this, and decided to
abandon the tactic when putNotify was developed.)

I would use a calcout record to write to the output record, and
set the calcout record's OOPT field to "On Change".

Is there a way for me to set a bo (or ao) record so that it only
processes when it's value is changed?

I've got a number of those records that I only need written to the PLC
when the value is changed.

David

--
Tim Mooney ([email protected]) (630)252-5417
Beamline Controls & Data Acquisition Group
Advanced Photon Source, Argonne National Lab.

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Re: Process 'bo' on write? David Dudley

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