Re: 'best' control network? Devicenet vs Lonworks vs CAN vs Fieldbus vs Ethernet ???

From: H.-J.Oertel (hj.oertel_at_surfeu.de)
Date: 07/23/04 

Date: Fri, 23 Jul 2004 19:24:09 +0200

perfb wrote:

> no doubt this is a FAQ oft beat to death, but, assuming
> one wanted to control a network of about 10 i/o modules each
> with maybe 100 i/o digital/analog points, at maybe a 100Hz
> maximum rate (e.g. an automatic industrial processing machine of some
> kind) ...
>
> which control network would be, ahem, for lack of a better word, 'best'?
>
> (i.e. in terms of price/node, support, ease of development, availability
> of second-sources, availability of developers etc.?)
>
> Personally, being somewhat naive and ignorant of the field,
> I would go for ethernet, for sheer availability of tools and
> peripherals. But would I be making a gross faux-pas in doing so?
>
> is ethernet gaining ground as a general-purpose control network
> over e.g. CAN etc.?

CAN could be able to handle the required bandwidth, using the max. speed of
1Mbit/s. You can choose between CANopen or DeviceNet as higher layer
protocol. In both cases you can easily upgrade to an Ethernet based Data
Link Layer, e.g. Ethernet-Powerlink or EthernetIP, without changing much
your application level software.

Ethernet based field busses will definitely complement CAN based if high
bandwidth is really needed.

Regarding you subject line:
> Re: 'best' control network? Devicenet vs Lonworks vs CAN vs Fieldbus vs
Ethernet ???

DeviceNet _is_ CAN. 

-- 
with best regards / mit freundlichen Grüßen
   Heinz-Jürgen Oertel
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