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

Subject: RE: EtherIP & AB PLC's
From: "Rarback, Harvey" <rarback@slac.stanford.edu>
To: "'D Wetherholt'" <wether@jlab.org>, "'tech-talk@aps.anl.gov'" <tech-talk@aps.anl.gov>
Date: Fri, 28 May 2004 18:44:17 -0700
	David,

> -----Original Message-----
> From: D Wetherholt [mailto:wether@jlab.org]
> Sent: Friday, May 28, 2004 10:29 AM
> To: tech-talk@aps.anl.gov
> Subject: EtherIP & AB PLC's
> 
>   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?

At SSRL we have been using Kay's EtherIP driver for two years.  The first version we tried was v1.3 built with EPICS base 3.14.1beta0 and Tornado 2.0.2 where we saw a problem similar to yours:  a bo record writing a zero to a BOOL tag would change the tag briefly, but the driver would soon set it back to 1.  An ao writing to the same tag would write fine.  The problem went away with version v1.4.  We are currently up to version 1-11.

                               --Harvey Rarback

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