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<== Date ==> <== Thread ==>

Subject: RE: Naming Conventions and Control Logix
From: "Dalesio, Leo `Bob`" <dalesio@slac.stanford.edu>
To: "John Dobbins" <jad@lepp.cornell.edu>, "EPICS Tech-Talk" <tech-talk@aps.anl.gov>
Date: Fri, 12 May 2006 09:07:51 -0700
IT is best to pass data from the Control Logix PLC to the IOC in arrays. Kay Kasemir did a very good study on the performance and found that the throughput was very sensative to the number of tags you are transferring. In the last three projects I worked on, we placed the PLC values into tagged arrays according to the rate that we wanted to transfer them. The PLC was already dedicated to a single subsystem.
Bob

-----Original Message-----
From: John Dobbins [mailto:jad@lepp.cornell.edu] 
Sent: Friday, May 12, 2006 9:05 AM
To: EPICS Tech-Talk
Subject: Naming Conventions and Control Logix

ControlLogix Users,

I am wondering what folks do about ControlLogix Tag names when it comes to naming conventions.

1) As I understand it ControlLogix Tags names may contain underscores, letters, and numbers. Most naming systems include other separators such as hyphens, colons, periods. So what happens when these two meet?

2) Many times a ControlLogix tag has a corresponding EPICS database record. How do you distinguish these names, i.e. the Record name and the Tag name? Or are they the same and distinguished by context?

Thanks,

John Dobbins
Lab for Elementary Particle Physics
Cornell University




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