Experimental Physics and
Industrial Control System

"Gurd, Pamela A." <[email protected]> · Fri, 17 Nov 2006 13:35:23 -0500

Okay, I'll bite - I don't really see how that helps you get from the
end-user name to the hardware name, and hence to the hardware address.
You can get from the end-user name, looking into the IOC, to the
hardware address anyhow.  And if you have a rudimentary database, you
can get there, too.

It just adds a layer of complication, it seems to me.

   Pam.

> -----Original Message-----
> From: Emmanuel Mayssat [mailto:[email protected]]
> Sent: Friday, November 17, 2006 1:31 PM
> To: Gurd, Pamela A.
> Cc: Andrew Johnson; tech talk
> Subject: GOOD Naming conventions for devices and Epics records
> 
> I think what is important in this thread is not what naming convention
> is being used at site X, but rather what makes a GOOD naming
convention.
> 
> 
> Here is what I learned from naming conventions with epics.
> 
> 1/ I like to know which hardware part is providing the signal.
> This provides a tremendous help for low level debugging.
> (ex. Signals is from pin 2 on ADC 3 on computer X [located at Y])
> 
> 2/ End user cares about the meaning of the signal.
> (ex. Temperature of gun, setting of 3rd magnet in transport line)
> 
> 3/ PV names are often found hardcoded in programs
> 
> 4/ Low level and high level programming is managed by 2 different
> groups.
> 
> Solution:
> Use several (two) naming conventions!
> One for each level and use ALIASING!!!!!
> 
> Q: What happens if you change hardware?
> You change the low level PV names and the inputs of aliases.
> No need to change programs, striptools configuration files, etc.
> 
> Enjoy!
> 
> --
> Emmanuel Mayssat
> Lyncean Technologies, Inc
> 
> 
> 
> On Fri, 2006-11-17 at 12:33 -0500, Gurd, Pamela A. wrote:
> > It's true that we have had problems with the sequencer going over 28
> > characters, but I think they're less of a problem than it would be
to
> > try to stay within 28 characters.
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System