Re: EPICS to WAGO PLC using Ethernet MODBUS

["Bob Dalesio" <ldalesio@lanl.gov>]

If I could add my two cents..... it is also our experience 
that the Modbus protocol is the most common bus protocol. 
Whatever driver is used should have the ability to only 
send requests for those blocks that are requested by the 
database, include lots of diagnostic information regarding 
the state of health of the communication, write outputs to 
the remote I/O promptly, and be able to read values that 
were set from a different master.
Is this something that we should cover in the next EPICS 
meeting?
Bob

On Fri, 21 Nov 2003 20:59:39 -0600
 "Elder Matias" <Elder.Matias@lightsource.ca> wrote:
> John/Eric,
>
> We are willing to provide you with a copy of our version. 
> At CLS we run
> most of our IOC software under either RTEMS or Linux.  In 
> this
> particular case the driver is written for RTEMS and has 
> primarily been
> used to talk to MODICON Momentum PLCs and a few other 
> related
> applications, such as power meters from PML.  We are also 
> willing to
> look at merging in changes you may have made.
>
> If there is wider interest I can have the driver and 
> design note tossed
> onto an ftp site.
>
> Elder Matias
> Canadian Light Source
> University of Saskatchewan
>
> -----------------------------
>
> John Maclean <jfm@aps.anl.gov> 
> Subject: Re: EPICS to WAGO PLC using Ethernet MODBUS 
> From: Eric Williams <ECWilliams@lbl.gov> 
> Date: Fri, 21 Nov 2003 10:10:32 -0800 
> Cc: tech-talk@aps.anl.gov 
> In-reply-to: <3F5E1DB4.8E25E86C@aps.anl.gov> 
> References: 
> <Pine.LNX.4.55.0309091451280.4764@kryklinuxb.desy.de>
> <3F5E1DB4.8E25E86C@aps.anl.gov> 
> User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; 
> en-US; rv:1.4.1)
> Gecko/20031008 
>
> John,
> Can you please email me with a place where I can get 
> this?
> I think the EPICS community should settle on one of these 
> to concentrate
> their efforts on. I've been doing a survey of PLCs with 
> Ethernet field
> bus capability, and MODBUS over TCP/IP is the most common 
> protocol in
> the market.
> --
> Eric Williams
> Advanced Light Source
> Lawrence Berkeley Lab
>
> John Maclean wrote:
>
>
> I have Ethernet-MODBUS support which is based on code 
> obtained from the
> Canadian Light Source. The CLS code is written to run on 
> RTEMS and
> supports Modicon PLCs.
> I modified it to be OS independent, to work with 3.14.2 
> and to add
> support for Siemens power meters.
> John.
>
> Vladis Korobov wrote:
>
>
>
> Hi all,
>
> I have to connect from EPICS to WAGO System PLC using 
> MODBUS protocol
> (via Ethernet).
> Has anybody any software for such kind of communication?
>
>
> Any suggestions and advise will be appreciated,
> -----------
> Vladislav Korobov
> MKS-2 Group, DESY
> Notkestr. 85
> 22607 Hamburg, Germany
> tel. +49 40 8998 3947
> e-mail:vladis.korobov@desy.de or
>        korobov@mail.desy.de

Bob Dalesio
ldalesio@lanl.gov
410 557 0297 Maryland
505 667 5643 Los Alamos (New Number)
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505 667 6087 Our Secretary (Lisa Marie)