Experimental Physics and
Industrial Control System

Matthieu Bec <[email protected]> · Wed, 12 Nov 2008 14:33:00 -0300

We use reflective memory (GeFanuc) to convey fast information between
remotely separate systems. The nodes come in different h/w flavor (PCI,
VME,...) linked by fiber. Our nominal rate is 200Hz.

I don't know if thats the cross-IOC solution you are looking - if you
think a big pool of memory that can shared between remote processes,
that as wake-up/broadcast capabilities, that might be an option. It's
been good for us!
Matthieu

Ralph Lange wrote:

Hello!
What would be the smartest way to implement fast cross-IOC loops that
are high-priority?
Problem: The CA server tasks on the target IOC are low priority (for
good reasons, I know!), so that - even with a fast synchronous device
support -

any stupid slow-and-low record processing on that IOC will introduce
delays, which leads to jitter or multiple CA updates before the target
record gets processed.
Oh, yes: "fast" would be something below 200Hz.
Any hints welcome...
Ralph

--
Matthieu Bec              Gemini Observatory
Tel: +56 51 205785        c/o AURA, Casilla 603
Fax: +56 51 205650        La Serena, Chile

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System