SIXNET automation products are built on open industrial standards and fit together seamlessly to provide the perfect modular components for open automation systems.

Makers of special PLC components, HMIs, and automation software for Siemens SIMATIC S5 and S7 PLCs. Check out their "world´s fastest" STEP®7 PLC processor at http://www.speed7.com.

Manufacturer of embedded programmable logic controllers (ePLCs) for OEMs
since 1978, offering free programming software, 5 & 7 year warranties, free
factory support. Marketers of operator interfaces, touch screens and other
peripheral products used in conjunction with PLCs. We also provide a
program development service for OEM customers.

ePLC products include the Smart-PAK series micro ePLCs, SK1600-RIC and
Elite-2000. I/O ranges from 6/6 up to 64/64 plus analog capabilities.

The main focus of this ABB business is to provide customers with integrated solutions for control, plant optimization, and industry-specific application knowledge. The industries served include oil and gas, power, chemicals and pharmaceuticals, pulp and paper, metals and minerals, marine and turbocharging. Key customer benefits include improved asset productivity and energy savings.

Gross Automation is a distributor of ABB PLCs.

Unitronics designs, manufactures and markets quality PLCs for the global market.

Easy to use, efficient, and affordable, Unitronics? products have been automating processes and stand-alone applications since 1989.

Unitronics? OPLC? controller series integrate PLCs and built-in operating panels into a single compact device. This unique PLC + HMI concept saves wiring, I/O points, and programming time.

Micro PLCs with expandable I/O and easy-to-use Ladder Builder software. Other functions include frequency counter, ramp-up/down controls, and more. Industry's first Programmable Logic Controller with a built-in data window for real time monitoring and changing of program parameters.

Popular Japanese company offering PLC among many other devices for automation control. The United States Omron web site is easier to navigate.

Major Japanese manufacturer of PLCs and other automation equipment.

If you are looking for support then go to the Mitsubishi Electric Automation site 

The original PLC owned now by the Schneider Group.

A leading European electrical and electronics firm offering a wide range of automation controls. Good luck on their website as I have a hard time finding what I need. You may have more luck at the Automation and Drives section.