Experimental Physics and Industrial Control System

On 4/24/08 10:53 AM, John Dobbins wrote:
> Dear All,
> 
> I have a waveform record which reads consecutive values from hardware
> memory (happens to be Modbus over ethernet). I then use a subArray
> record to pick out individual values. However if the hardware goes
> off-line (so the waveform is temporarily invalid) the subArray record
> changes its INDX field to 0! When the hardware comes back on-line the
> subArray record now points to the wrong location in the waveform.
> 
> Is this intended? Suggestions for avoiding this situation?

Hi, John.

I reported the same problem last year.  An archive of the discussion is at

  http://www.aps.anl.gov/epics/tech-talk/2007/msg01432.php

I wish the fix could go into an earlier version of EPICS base, but maybe
Andrew is concerned about changing the behavior and thus possibly
breaking existing databases?

-lewis

-- 
J. Lewis Muir
Software Engineer
IMCA-CAT/CARS

Replies:

RE: sub-array question Gillingham, IJ (Ian)

Re: sub-array question Geoff Savage

RE: sub-array question Denison, PN (Peter)

References:

sub-array question John Dobbins

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