Re: [foxboro] CP60 vs IEC61508 safety requirements

I agree with Andreas.  The CP's are the kind of product that needs to have an 
independent Safety System behind them to protect a hazardous process from 
failure.  Even two CP's, one acting as a process controller and one acting as a 
Safety controller do not have enough independence from comon faults to meet IEC 
or ISA Process Safety Standards.

 

Terry
 
> To: foxboro@xxxxxxxxxxxxx
> Subject: Re: [foxboro] CP60 vs IEC61508 safety requirements
> From: andreas.weiss@xxxxxxxxx
> Date: Thu, 5 Nov 2009 08:23:32 +0100
> 
> 
> >I'm interested to know if there was any tentative to certify the 60 CPs to
> >IEC61508 safety requirements, even through a proven-in use analysis/study.
> >
> >One more thing am interested in is PFD, SFF andfailure statistics for this
> >kind of CPs
> >
> The CP60 is not in sale anymore. I wouldn't believe that they do something
> like that for the xCP270. 
> You have to buy a fail safe control system to get all these kind of data. 
> 
> Regards, 
> Andreas 
> 
> 
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