Experimental Physics and
Industrial Control System

"Elder Matias" <[email protected]> · Mon, 24 Nov 2003 08:40:17 -0600

Bob,

The other one to consider that is also fairly popular is Profibus.  Like
most places we end up having both MODBUS and Profibus equipment.  In our
case we use a DIN rail mounted PC from PEP Modular (Linux based with
PC/104 card) to talk to Siemens S7/300 and S7/400 PLC hardware.  CERN
uses Profibus over Ethernet and some other labs use VME cards.

As a side note, the Modbus driver we have is derived from an earlier
driver you had written for Modbus over a serial connection.

Thanks,
Elder

To: "Elder Matias" <[email protected]>, <[email protected]>,
<[email protected]> 
Subject: Re: EPICS to WAGO PLC using Ethernet MODBUS 
From: "Bob Dalesio" <[email protected]> 
Date: Sat, 22 Nov 2003 05:27:19 -0700 
Cc: <[email protected]>, [email protected] 
In-reply-to: <[email protected]> 
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