I appreciate your comments but we are not wanting to develop a PLC. We are
developing a specific product that will enhance our Wireless connectivity
products. It will incorporate many functions not available in a PLC.

We are interested in the mechanics of how PLC logic is presented to the
controller in a typical PLC but have no intention of reinventing an existing
product.

Kind Regards

David Huisman (CEO)
-----------------------------------------------------------------------
ORBIT COMMUNICATIONS - Wireless Solutions that Work
(Telemetry, Control, Monitoring, Security, HVAC ...)

Website : http://www.orbitcoms.com
PO Box 4474 Lakehaven
NSW 2259, AUSTRALIA
Phone: 61-2-4393-3627
Fax  : 61-2-4393-3685
Mobile: 61-413-715-986
----- Original Message -----
From: "Micro Eng" <micro_eng@HOTMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, January 28, 2003 1:07 AM
Subject: Re: PLC help


> First off...I've been doing PLC and ladder logic stuff for about 20 years.
> Unless you have a buring desire to do this for fun, the product for a
small
> market might not be worth it, when you can buy all the pieces for what it
> might cost to develop your own.  For a specific use controller, which is
> what PIC's are great for, then it makes sense to build a board, etc but
> write the code in C or assembly since it is for target use.
>
> Now, for PLC applications, the only reason to write ladder logic is
legacy.
> In other words, thats the way its always been done, and the control
> engineers understand it (maybe some don't relize its a throwback to real
> ladder logic of using relays and timers) so why mess with it?  To get back
> to the subject at hand, there is a company called Direct Automation that
> sells the stuff pretty darn cheap, because its thier brand, albiet it it
> probably a japanese remark, but you aren't paying the price for a Siemens
or
> AB unit.  Of course, some outfits demand an AB unit, because of the name
> associated with it.  I've developed using AB software, Rockwell, GE,
> Siemens, TI and a few other off brand things, and they are all about the
> same.
>
> Just my .02 worth
>
>
>
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