Engineers and developers looking for a programmable logic controller (PLC) might be worth checking out the new CANADUINO Arduino MEGA 2560 compatible PLC which has been created by Universe Solder ...

It’s a significant update. The Arduino UNO and Arduino Mega 2560 update the Duemilanove and Mega respectively. They now use an ATMega8U2 instead of an FTDI USB to serial converter chip.