On Wed, Nov 17, 2010 at 07:55:56PM -0800, Daniel B. Herrington wrote:
> All,
> 
> I'm starting to do some investigation of PLCs for a project involving
> marine (ship) management.

Sounds interesting.
It sounds like your best bet is to use Modbus over serial or ethernet.
There's a lot of OSS Modbus stuff.
http://libmodbus.org/documentation/
http://qmodbus.sourceforge.net/
http://mblogic.sourceforge.net/mbapps/apps.html

Also: http://www.beremiz.org/

I took some A-B PLC classes a few years ago, but never got to use it.
All the OSS A-B stuff fell off the net.
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