On Feb 5, 2008 12:11 PM, Brent Brown <brent.brown@clear.net.nz> wrote:
> On 4 Feb 2008 at 20:44, Jeff Latta wrote:
> > It's a long shot but ........
> >
> > Has anyone seen interface cards/circuits for sale to provide this
> > protection to a microcontroller?
> > I'm thinking of a small multi-port add-in board that would provide a
> > level of protection similar to what a typical PLC has.
>
> Opto 22 is a company that does modules like that I think. Pretty sure
> you can build a system using their I/O blocks with your own processor
> (or theirs).
>
> http://www.opto22.com/
>

Somehow it seems that in the end it will be cheaper and more reliable
to buy a small PLC which include the I/O than to buy a separate I/O
and then develop your own system.

Xiaofan
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