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

Subject: Fieldbus's
From: SIBLEY@AESIR.MIT.EDU
To: tech-talk@aps.anl.gov
Date: Thu, 9 Jan 1997 14:33:53 -0500 (EST)
>> Hello All,
>> 
>>       We have been looking at fieldbus's to replace the BITBUS for
>> new projects at Bates.  Both PROFIBUS and CAN look promising.
>> Can someone comment on the advantages or disadvantages of PROFIBUS
>> verses CAN?
>> 
>> Thanks,
>> 
>> Coles Sibley
>>
>
>
>Hi Coles,
>
>  We're in the same situation. Please keep us informed on what you
>  find out. Currently, we are investigating the Universal Serial Bus
>  that is coming out for the PC's to see if it is applicable as a
>  field bus. It will be cheap, well debugged, well supported, and
>  well documented (unlike Bitbus). Not sure if it will work over
>  fiber ...
>  
>  
>  	Keep in touch -
>  	
>  		Ned

Hi Ned,

Have you looked into the Foundation Fieldbus?  The Foundation Fieldbus
is the result of a merger between the Interoperability Systems Project
ISP and WorldFIP.  It's a very new standard in the US and is in the 
process of being standardized worldwide(?) as the ISA/IEC SP50 specification. 


speed (H2) @500m	2.5 Mbit
data per packet		1000 bytes

(lots more data at www.fieldbus.org/business/information/ffmain.html)

commercial support
	Several companies have commercial developers packages
	available but commercial availability of remote IO is
	not expected until later this year.	  		

Coles


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