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Experimental Physics and
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<== Date ==> <== Thread ==>

Subject: EtherIP & AB PLC's
From: D Wetherholt <wether@jlab.org>
To: tech-talk@aps.anl.gov
Date: Fri, 28 May 2004 13:28:50 -0400
Hi All,

  If anyone has any experience with the EtherIP driver, I was wondering
if they have run across the same problem I have described below. I am
using it with a r3.13 release of EPICS, mv177 front-end, HPUX 11
back-end.

  The EtherIP driver is installed and appears to be talking correctly
across the ethernet to an Allen Bradley Logix555 PLC. I am reading and
writing DINT's, but the rather simple operation of writing a "0" to a
BOOL tag does not seem to be working. It's tied to a choice button
through
MEDM (also tried a momentary button, and even a "dbpf" from the command
prompt). On the other hand, it's writes a "1" fine. Has anyone
experienced
this and/or know what the "fix" is?

  On a related note, has anyone thought about expanding the driver to
also talk to program tags? Our engineers are really interested in that
functionality.

  Thanks!

David Wetherholt (wether@jlab.org)
Jefferson Lab

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