From: "Rufus V. Smith"
References: <email@example.com> <firstname.lastname@example.org> <email@example.com>
Subject: Re: Avoiding PLCs
Date: Thu, 17 Oct 2002 08:38:32 -0400
X-Newsreader: Microsoft Outlook Express 5.50.4807.1700
"Michael Marx" wrote in message news:firstname.lastname@example.org...
> "Walter Driedger" wrote in message
> >> One more time, WE DO NOT WANT SPECIALIZED HARDWARE AND WE DO NOT
> >> WANT SPECIALIZED PROGRAMMING.
> this is getting very interesting here. Just look at it from my point of view
> We are a German based manufacturer of specialized machinery (for paper
> handling & transport, but that does not matter). We have considerable
> experience and a good customer base in Europe. Nearly (i.e. 99,5%) all of
> our machines are equipped with Siemens PLC which is "the European way" to do
I think Siemens has fabulous equipment. When I first saw the new (at the time)
Step 7 software I was blown away! Someone had finally brought a kind of object
oriented, encapsulated, detail hiding software to the plc world. They also have
a quality HMI in their WinCC product, and they created Profibus. Not too shabby.
If I had a large PLC project, I'd probably go with Siemens. However, if I had
a small one, I'd probably go Automation Direct, just for cost factors.
If the product you offer is encapsulated enough that no reprogramming is
expected for the life of your product, it shouldn't matter what the platform you
use (as long as spare parts or the equivalent are available from the manufacturer).
However, if your product is part of an Agile Manufacturing production line, then
you have to be more flexible. If reprogramming is a common event, then it
would certainly help plant programmers to be able to stick with the "devils they know".