Experimental Physics and
Industrial Control System

Ben Franksen <[email protected]> · Mon, 30 Jan 2012 02:05:34 +0100

Am Freitag, 27. Januar 2012, 22:46:42 schrieb Matthieu Bec:
> I am looking for a framework to develop state machines, à la SEQ/SNL but
> ... not targeted to epics or channel access.

Which system are you interested in, instead of EPICS/CA?

> The PV API - still present in seq-2.1.4? - seems to go in the right
> direction, but I recall a discussion in 2010 stating it might eventually
> go away.

Does your system fit the PV API framework? It should at least support 
subscriptions, i.e. notification messages when a value changes. How are a 
variable's alarm status and severity encoded and is this compatible to the way 
the PV API defines them?

I may be persuaded to keep the PV layer if it turns out it is of any practical 
use. I just don't like to maintain code that nobody uses and thus merely adds 
overhead (runtime and maintenance costs). BTW, the sequencer uses only a 
subset of the existing API, which I can identify to you, if you are 
interested. In any case it would make sense to reduce the API to what the 
sequencer actually needs.

Cheers
Ben

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System