Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  <20112012  2013  2014  2015  2016  2017  2018  2019  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  <20112012  2013  2014  2015  2016  2017  2018  2019 
<== Date ==> <== Thread ==>

Subject: Re: EPICS and large CAN systems
From: Burkhard Kolb <b.kolb@gsi.de>
To: Elliott Wolin <wolin@jlab.org>
Cc: Hovanes Egiyan <hovanes@jlab.org>, Elton Smith <elton@jlab.org>, Matthew Shepherd <mashephe@indiana.edu>, tech-talk@aps.anl.gov
Date: Wed, 16 Mar 2011 14:30:23 +0100
Hi Elliot,

to my knowledge you can connect about 40 devices to 1 CAN bus, for bus load reasons.
You should also consider that any break in the CANbus lines will disconnect all
devices behind the disruption.

We had something like 30 devices (Wiener crates, and similar devices) to one TIP810 controller.
This turned out to be very messy when people disconnected a crate and forgot to bridge
the cable.

Burkhard
--
Dr. Burkhard Kolb
Tel +49 6159 712667
GSI Helmholtzzentrum für Schwerionenforschung GmbH
Planckstraße 1 | D-64291 Darmstadt | www.gsi.de

Gesellschaft mit beschränkter Haftung
Sitz der Gesellschaft: Darmstadt
Handelsregister: Amtsgericht Darmstadt, HRB 1528

Geschäftsführung: Professor Dr. Dr. h.c. Horst Stöcker, Dr. Hartmut Eickhoff
Vorsitzende des Aufsichtsrates: Dr. Beatrix Vierkorn-Rudolph
Stellvertreter: Ministerialdirigent Dr. Rolf Bernhard




Am 16.03.2011 um 14:16 schrieb Elliott Wolin:

> To all EPICS CAN experts,
> 
> We are about to construct a 3000 channel CAN system.  Please contact me if you have any experience controlling CAN buses from EPICS.
> 
> Our current thought is to use about 8 Anagate Ethernet-to-CAN controllers, four channels per controller, to talk to the CAN  devices, about 100 devices per CAN bus.  We'd use the ASYN framework to implement the driver that talks to the Anagate devices (they communicate via TCP/IP).
> 
> I am open to suggestions and alternative solutions.  I am especially interested in existing drivers for any type of Ethernet-based CAN controller so that we can avoid writing a new driver.
> 
> Also, is the ASYN framework the best choice if we have to develop a new driver?
> 
> Finally, to Marty Kraimer et al:  is the Java IOC and port driver framework ready?  Might we use this instead?
> 
> Thanks,
> 
> -- 
> 
> 				Sincerely,
> 					Elliott
> 
> ================================================================================
> 
> 
> Those raised in a morally relative or neutral environment will hold
> 		    no truths to be self-evident.
> 				   
> Elliott Wolin
> Staff Physicist, Jefferson Lab
> 12000 Jefferson Ave
> Suite 8 MS 12A1
> Newport News, VA 23606
> 757-269-7365
> 
> ================================================================================
> 



References:
EPICS and large CAN systems Elliott Wolin

Navigate by Date:
Prev: EPICS and large CAN systems Elliott Wolin
Next: Re: Autosave config file Tim Mooney
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  <20112012  2013  2014  2015  2016  2017  2018  2019 
Navigate by Thread:
Prev: EPICS and large CAN systems Elliott Wolin
Next: Re: EPICS and large CAN systems Rod Nussbaumer
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  <20112012  2013  2014  2015  2016  2017  2018  2019 
ANJ, 18 Nov 2013 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·