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

Subject: RE: Remote I/O
From: "Mark Rivers" <[email protected]>
To: <[email protected]>
Cc: [email protected]
Date: Wed, 16 Dec 2009 15:05:40 -0600
Yes, the Direct Logic range. I've used the DL205 with the H2-COM100 Ethernet module.  I think our complete system with lots of digital I/O was under $1500.
 
I am using it for a safety system on a gas-loading apparatus.  The PLC implements the safety, but receives requests and sends status over Modbus to a Windows EPICS IOC.
 
I've also tested it as a simple I/O system, with essentially no PLC ladder logic program running at all.  That is what the example IOC in my "modbus" EPICS module does.
 
Mark
 

________________________________

From: [email protected] [mailto:[email protected]]
Sent: Wed 12/16/2009 2:54 PM
To: Mark Rivers
Cc: [email protected]
Subject: RE: Remote I/O



Mark,

I presume the Koyo PLC's are from their DirectLogic range. Which ones in
particular?

Cheers,

Nick Rees
Principal Software Engineer           Phone: +44 (0)1235-778430
Diamond Light Source                  Fax:   +44 (0)1235-446713

> -----Original Message-----
> From: Mark Rivers [mailto:[email protected]]
> Sent: 16 December 2009 16:35
> To: Rees, Nick (DLSLtd,RAL,DIA); [email protected]
> Subject: RE: Remote I/O
>
> Nick,
> 
> On a relatively small scale I've been pleased with the
> Modbus/TCP interface to Koyo PLCs from Automation Direct.
> These PLCs allow direct communication with the I/O points
> through Modbus.  Some other manufacturers only allow Modbus
> access to memory registers, which the PLC program must
> read/write with the I/O point value.  There is a scanner
> running, but the Koyo PLCs are very inexpensive so cost is
> really not much of an issue.
> 
> Mark
> 
>
> ________________________________
>
> From: [email protected] on behalf of
> [email protected]
> Sent: Wed 12/16/2009 6:44 AM
> To: [email protected]
> Subject: Remote I/O
>
>
>
>
> At Diamond we are considering what to use for the next generation of
> discrete I/O. Currently we have a lot of VME based hardware,
> but we are
> considering a good architecture for a Linux world.
>
> The model that we are considering is a soft IOC on a Linux system
> communicating over Ethernet using an open, industry standard
> protocol to
> distributed DIN-Rail mounted I/O points. These I/O points take in
> Ethernet and are powered from a 24V bus that will run around the
> hardware area.
>
> This eliminates any dependence on a specialized bus
> architecture (apart
> from Ethernet) on the Linux system, so they can be commodity PC's, and
> hopefully allows us to use widely available, cheap, industrial modules
> for I/O. It will not completely replace all of the requirements
> currently serviced by VME, but would be able to satisfy most of them,
> with the remaining few being serviced by the occasional VME system (or
> FPGA, or some other bus, or something else entirely in the future...).
>
> This email is to poll the EPICS community as to the experience people
> have had, and recommendations for and against.
>
> The sort of thing we have identified are:
>
>  1. Modbus/TCP based modules, such as the Acromag Busworks series
> http://www.acromag.com/models.cfm?Product_Function_ID=28&Categ
ory_ID=22&
> Group_ID=2
>  2. EtherCAT base modules, such as those from Beckhoff:
> http://www.beckhoff.com/
>  3. Standard PLC systems where (as distinct from the other two), you
> take Ethernet to a PLC controller which then has a series of
> modules it
> talks to in a variety of possible ways.
>
> So, is anyone willing to share their experiences with these or similar
> systems,
>
> Cheers,
>
> Nick Rees
> Principal Software Engineer           Phone: +44 (0)1235-778430
> Diamond Light Source                  Fax:   +44 (0)1235-446713
>
> --
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> Oxfordshire, OX11 0DE, United Kingdom
>
>
>
>
>
>
>
>

--
This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail.
Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd.
Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message.
Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom








References:
Remote I/O nick.rees
RE: Remote I/O Mark Rivers
RE: Remote I/O nick.rees

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