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From: firstname.lastname@example.org (bob peterson)
Subject: Re: Avoiding PLCs
Date: 14 Oct 2002 07:12:54 -0700
NNTP-Posting-Date: 14 Oct 2002 14:12:54 GMT
"JohnS" wrote in message news:...
> We have run into a problem, hope someone here can make a helpful
> suggestion! We have a digital control system which is fairly easily built
> using a plc. (Lots of interlock logic, timers, 4/20 mA circuits, 4 line
> display, etc) Unfortunately every customer then seems to insist that we
> build using the make of controller already in use by them. In order to avoid
> this I am looking for modular electronic systems that we can program in C or
> whatever so we can avoid using a PLC, but still have the flexibility to add
> I/O etc as required.
> We could design from the ground up, but there must be suitable systems out
> there, ideally with CE and UL approval!. Any pointers to possibles would be
> much appreciated.
Most plants need something their own people can maintain. Things
programmed in "C" generally don't meet that requirement. Think of it
from their perspective. Would you want to be over a barrel to an
outside vender who wrote a bunch of custom code you can't fix
yourself? Particularly if its a critical system.
Its why they want a real PLC, not some kludge together someone came up
with that is really good at generating field service revenue.
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