Experimental Physics and
Industrial Control System

"Bob Dalesio" <[email protected]> · Sat, 22 Nov 2003 05:27:19 -0700

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" <[email protected]> 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 <[email protected]>
Subject: Re: EPICS to WAGO PLC using Ethernet MODBUS
From: Eric Williams <[email protected]>
Date: Fri, 21 Nov 2003 10:10:32 -0800
Cc: [email protected]
In-reply-to: <[email protected]>
References:
<[email protected]>

<[email protected]>
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:[email protected] or
       [email protected]

Bob Dalesio
[email protected]
410 557 0297 Maryland
505 667 5643 Los Alamos (New Number)
505 699 1632 Cell Phone
505 667 6087 Our Secretary (Lisa Marie)

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System