Experimental Physics and
Industrial Control System

Emmanuel Mayssat <[email protected]> · Mon, 17 Sep 2007 16:28:48 -0700

On Sat, 2007-09-15 at 15:09 -0600, Elder Matias wrote:
> Emmanuel,
> 
> I would agree with John, at the control system design stage you need to
> determine how you are allocating functionality to the sub-systems.  At
> the CLS we configure EPICS so that it can go down and equipment and
> people are still protected.    
> 

Oh, it seems that I misunderstood John's email... My apologies.
I assumed that he was not using a PLC. Yes, we want all the same thing
(no flame war here!) EPICS, computer, IOCs can go down, then the PLC
takes over...

What I am interested in is the detection of the computer failure, not
its resolution. The remote reboot facility which John describes is a
nice feature which I may decide to implement in the future.

To summarize, given my environment, to detect a computer failure, I may
just need a cheap PLC like the Koyo ones and connect it to the other one
I have in place (Siemens PLC not network enabled).

This may not be my final design, but already I would like to thank you
all for you useful suggestions.

Regards,
--
E

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System