Re: Process 'bo' on write?

["David Dudley" <DavidDu@cctexas.com>]

Unfortunately, all my sites are not connected together over the network,
some are handled using 1200 baud radios.

This is one of our remote facilities, where we handle Hydrofluoric acid
(probably misspelled that one), Gaseous and Liquid Chlorine, and Liquid
Ammonium Sulfate.  The alarm is to notify residents in the area in case
of a chemical mishap or leak.  I'm lucky to have a PLC and a IOC
available at this site, and I don't think there's enough space on the
IOC's ram disk for me to run the alarm handler as well.

The site's pretty much dictated to me, and I'm using the IOC to
communicate with all the gas detectors, make decisions about what's
dangerous, and set off alarms.

I'm replacing a PC that we had at the site, that ran a custom piece of
software written about 10 years ago, with an EPICS IOC.  Not the best
design, but the PC cratered, so it gave me an opportunity.

David

>>> Maren Purves <m.purves@jach.hawaii.edu> 10/6/2008 1:29 PM >>>
David,

any reason why you're not using the alarm handler?

Maren

David Dudley wrote:
> 
> I've got a PLC that handles alarm notifications.  This PLC runs only
2
> things - a 120DB horn, and the brightest strobe light you've ever
seen
> in your life (OK, some of you guys have probably seen something
> brighter, just not me ;-).
> 
> When a NEW alarm comes in (which is a output BIT that writes to a
PLC
> control register), the PLC clears that bit, resets a couple of
latching
> relays, and then sets off the horn, and/or the strobe.  This happens
> every time this bit is written as a '1'.  As long as the alarm bit
in
> EPICS is set, I don't want to output the bit to the PLC again.  Only
> when the bit is initially set to a non-zero do I want to write to
the
> PLC.

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