Experimental Physics and
Industrial Control System

Paul Hamadyk <[email protected]> · Thu, 17 Dec 2009 13:26:30 +0000

On Thu, 2009-12-17 at 08:08 -0500, Wesley Moore wrote:
> At the FEL here at JLAB, we have several newer systems running Omron 
> C-Series PLCs.  The systems currently running are the Laser Personal 
> Safety System, Turning Mirror Cassettes (motor control for optics), and 
> our UV vacuum system.  The PLCs are all programmed over Ethernet using 
> Omron's CX-Programmer and an EPICS Ethernet driver is used for 
> communication to the PLCs memory.  I've not had much hassle in 
> maintaining an IOC app and PLC logic for a given system.  Usually the 
> logic is only on one side depending on the requirements.  I've scripted 
> the creation of address files for generating the db.  The address file 
> created contains all the memory mapping and comments, providing great 
> documentation of each system.  Haven't heard this mentioned, but one 
> other benefit we have deployed was the use of touchscreens for 
> interactions with these PLC systems.  For the minimal programming 
> required, they have been a valuable resource in the flexibility they 
> provide for local and remote control (using serial and Ethernet). 
> 
> Wesley
> 

We also use Omron PLCs, mostly CJ1s, and communicate using Hostlink or
FINS (Factory Interface Network Service) in a Hostlink wrapper via the
serial port (using streams and asyn). I am just performing some speed
comparisons between the serial port and the ETN21 Ethernet module using
FINS/UDP and FINS/TCP.

You say that "an EPICS Ethernet driver is used for communication to the
PLCs memory". Is that via FINS?

Paul.

-- 
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

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System