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

References:

sub-array question John Dobbins

Re: sub-array question J. Lewis Muir

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