Experimental Physics and
Industrial Control System

I would echo Ron's comments.  Like SLAC, the CLS and I would even assume
the majority of EPICS sites there is a very clear dividing line between
safety critical and non-safety critical systems.  We all end up having
slightly different regulations we work under but the principles are very
similar.

I think from what David said he's on the same side of the issue as we
are with our house water alarm (at the telescope on Mauna Kea).

Most of you may not have the experience what it's like to run out of
water because your water isn't in a local tank. Ours at the telescope
is, and if a toilet is running over night we're out of house water
by morning. That means lugging water or closing the facility, and
somebody scrambling to get a tanker truck up as soon as possible,
which in bad weather can take days.

We have a strain gauge connected to an EPICS database that provides
water readings, and they're logged and a cron job emailed every
weekday morning, and we have an alarm handler that notifies people
when the tank goes below 30% and again when the tank goes below
20%. The pump shuts down at 3% (hardware, and hasn't failed yet
for all I know). Notification is _all_ EPICS based.

Certainly not as safety critical as potentially leaking HF, but
David also said that the EPICS alarm is his first line of defense,
and after that people take over.

References:

RE: Process 'bo' on write? Elder Matias

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